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Texas Instruments TMS320DM646x DMSoC ARM Subsystem Reference (Rev. E) User guides
TMS320DM646x DMSoC
ARM Subsystem
Reference Guide
Literature Number: SPRUEP9E
August 2010
2
SPRUEP9E – August 2010
Copyright © 2010, Texas Instruments Incorporated
Contents
......................................................................................................................................
Introduction ......................................................................................................................
1.1
Overview ....................................................................................................................
1.2
ARM Subsystem in TMS320DM646x DMSoC .........................................................................
ARM Subsystem Overview ..................................................................................................
2.1
Purpose of the ARM Subsystem ........................................................................................
2.2
Components of the ARM Subsystem ...................................................................................
2.3
References .................................................................................................................
ARM Core .........................................................................................................................
3.1
Introduction .................................................................................................................
3.2
Operating States/Modes ..................................................................................................
3.3
Processor Status Registers ..............................................................................................
3.4
Exceptions and Exception Vectors ......................................................................................
3.5
The 16-BIS/32-BIS Concept .............................................................................................
3.5.1 16-BIS/32-BIS Advantages ......................................................................................
3.6
Co-Processor 15 (CP15) .................................................................................................
3.6.1 Addresses in an ARM926EJ-S System ........................................................................
3.6.2 Memory Management Unit (MMU) .............................................................................
3.6.3 Caches and Write Buffer ........................................................................................
3.7
Tightly-Coupled Memory ..................................................................................................
System Memory ................................................................................................................
4.1
Memory Map ...............................................................................................................
4.1.1 ARM Internal Memories ..........................................................................................
4.1.2 External Memories ...............................................................................................
4.1.3 DSP Memories ....................................................................................................
4.1.4 Peripherals ........................................................................................................
4.2
Memory Interfaces Overview .............................................................................................
4.2.1 DDR2 Memory Controller ........................................................................................
4.2.2 External Memory Interface ......................................................................................
PLL Controller ...................................................................................................................
5.1
PLL Module .................................................................................................................
5.2
PLL1 Control ...............................................................................................................
5.2.1 Device Clock Generation ........................................................................................
5.2.2 Steps for Changing PLL1/Core Domain Frequency .........................................................
5.3
PLL2 Control ...............................................................................................................
5.3.1 Device Clock Generation ........................................................................................
5.3.2 Steps for Changing PLL2 Frequency ..........................................................................
5.4
PLL Controller Registers .................................................................................................
5.4.1 Peripheral ID Register (PID) ....................................................................................
5.4.2 Reset Type Status Register (RSTYPE) .......................................................................
5.4.3 PLL Control Register (PLLCTL) ................................................................................
5.4.4 PLL Multiplier Control Register (PLLM) ........................................................................
5.4.5 PLL Controller Divider 1 Register (PLLDIV1) .................................................................
5.4.6 PLL Controller Divider 2 Register (PLLDIV2) .................................................................
Preface
11
1
13
2
3
4
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SPRUEP9E – August 2010
Contents
Copyright © 2010, Texas Instruments Incorporated
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29
30
30
30
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5.4.7
5.4.8
5.4.9
5.4.10
5.4.11
5.4.12
5.4.13
5.4.14
5.4.15
5.4.16
6
Power and Sleep Controller (PSC)
6.1
6.2
6.3
6.4
6.5
6.6
7
8
4
PLL Controller Divider 3 Register (PLLDIV3) .................................................................
Bypass Divider Register (BPDIV) ..............................................................................
PLL Controller Command Register (PLLCMD) ...............................................................
PLL Controller Status Register (PLLSTAT) ..................................................................
PLL Controller Clock Align Control Register (ALNCTL) ....................................................
PLLDIV Ratio Change Status Register (DCHANGE) .......................................................
Clock Enable Control Register (CKEN) ......................................................................
Clock Status Register (CKSTAT) ..............................................................................
SYSCLK Status Register (SYSTAT) ..........................................................................
PLL Controller Divider n Registers (PLLDIV4-PLLDIV6, PLLDIV8, PLLDIV9) ..........................
50
51
51
52
53
54
56
56
57
58
....................................................................................... 59
Introduction .................................................................................................................
Power Domain and Module Topology ..................................................................................
6.2.1 Power Domain States ............................................................................................
6.2.2 Module States .....................................................................................................
6.2.3 DSP Local Reset .................................................................................................
Executing Module State Transitions ....................................................................................
IcePick Emulation Support in the PSC .................................................................................
PSC Interrupts .............................................................................................................
6.5.1 Interrupt Events ...................................................................................................
6.5.2 Interrupt Register Bits ............................................................................................
6.5.3 Interrupt Handling ................................................................................................
PSC Registers .............................................................................................................
6.6.1 Peripheral Revision and Class Information Register (PID) .................................................
6.6.2 Interrupt Evaluation Register (INTEVAL) ......................................................................
6.6.3 Module Error Pending Register 0 (MERRPR0) ...............................................................
6.6.4 Module Error Pending Register 1 (MERRPR1) ...............................................................
6.6.5 Module Error Clear Register 0 (MERRCR0) ..................................................................
6.6.6 Module Error Clear Register 1 (MERRCR1) ..................................................................
6.6.7 Power Domain Transition Command Register (PTCMD) ...................................................
6.6.8 Power Domain Transition Status Register (PTSTAT) .......................................................
6.6.9 Power Domain Status Register (PDSTAT0) ..................................................................
6.6.10 Power Domain Control Register (PDCTL0) ..................................................................
6.6.11 Module Status n Register (MDSTAT0-MDSTAT45) ........................................................
6.6.12 Module Control n Register (MDCTL0-MDCTL45) ...........................................................
60
61
63
63
63
64
65
65
65
66
67
67
68
68
69
69
70
70
71
71
72
73
74
75
........................................................................................................... 77
7.1
Overview .................................................................................................................... 78
7.2
PSC and PLLC Overview ................................................................................................ 78
7.3
Clock Management ........................................................................................................ 79
7.3.1 Module Clock ON/OFF ........................................................................................... 79
7.3.2 Module Clock Frequency Scaling .............................................................................. 79
7.3.3 PLL Bypass and Power Down .................................................................................. 79
7.4
ARM and DSP Sleep Mode Management ............................................................................. 79
7.4.1 ARM Wait-For-Interrupt Sleep Mode ........................................................................... 79
7.4.2 DSP Sleep Modes ................................................................................................ 80
7.5
I/O Management ........................................................................................................... 81
7.5.1 3.3 V I/O Power-Down ........................................................................................... 81
7.6
USB Phy Power Down .................................................................................................... 81
ARM Interrupt Controller (AINTC) ........................................................................................ 83
8.1
Introduction ................................................................................................................. 84
8.2
Interrupt Mapping .......................................................................................................... 84
8.3
AINTC Methodology ....................................................................................................... 86
8.3.1 Interrupt Mapping ................................................................................................. 87
Power Management
Contents
SPRUEP9E – August 2010
Copyright © 2010, Texas Instruments Incorporated
www.ti.com
8.4
9
Interrupt Prioritization ............................................................................................
Vector Table Entry Address Generation .......................................................................
Clearing Interrupts ................................................................................................
Enabling and Disabling Interrupts ..............................................................................
Registers ...........................................................................................................
Fast Interrupt Request Status Register 0 (FIQ0) .............................................................
Fast Interrupt Request Status Register 1 (FIQ1) .............................................................
Interrupt Request Status Register 0 (IRQ0) ...................................................................
Interrupt Request Status Register 1 (IRQ1) ...................................................................
Fast Interrupt Request Entry Address Register (FIQENTRY) ..............................................
Interrupt Request Entry Address Register (IRQENTRY) ....................................................
Interrupt Enable Register 0 (EINT0) ...........................................................................
Interrupt Enable Register 1 (EINT1) ...........................................................................
Interrupt Operation Control Register (INTCTL) ...............................................................
Interrupt Entry Table Base Address Register (EABASE) ..................................................
Interrupt Priority Register 0 (INTPRI0) ........................................................................
Interrupt Priority Register 1 (INTPRI1) ........................................................................
Interrupt Priority Register 2 (INTPRI2) ........................................................................
Interrupt Priority Register 3 (INTPRI3) ........................................................................
Interrupt Priority Register 4 (INTPRI4) ........................................................................
Interrupt Priority Register 5 (INTPRI5) ........................................................................
Interrupt Priority Register 6 (INTPRI6) ........................................................................
Interrupt Priority Register 7 (INTPRI7) ........................................................................
System Control Module
9.1
9.2
9.3
9.4
9.5
9.6
9.7
9.8
9.9
9.10
10
8.3.2
8.3.3
8.3.4
8.3.5
AINTC
8.4.1
8.4.2
8.4.3
8.4.4
8.4.5
8.4.6
8.4.7
8.4.8
8.4.9
8.4.10
8.4.11
8.4.12
8.4.13
8.4.14
8.4.15
8.4.16
8.4.17
8.4.18
87
87
88
88
89
90
90
91
91
92
92
93
93
94
95
96
96
97
97
98
98
99
99
.................................................................................................... 101
Overview of the System Control Module ..............................................................................
Device Identification .....................................................................................................
Device Configuration ....................................................................................................
9.3.1 Pin Multiplexing Control ........................................................................................
9.3.2 Device Boot Configuration Status .............................................................................
9.3.3 Device Boot Process Status ...................................................................................
ARM-DSP Integration ...................................................................................................
9.4.1 ARM-DSP Interrupt Control and Status ......................................................................
9.4.2 DSP Boot Address Control and Status .......................................................................
Power Management .....................................................................................................
9.5.1 VDD 3.3 V I/O Power-Down Control ...........................................................................
Special Peripheral Status and Control ................................................................................
9.6.1 Universal Serial Bus (USB) Interface Control ...............................................................
9.6.2 Host Port Interface (HPI) Control .............................................................................
9.6.3 Video Clock Control and Disable .............................................................................
9.6.4 Transport Stream Interface (TSIF) Control ..................................................................
9.6.5 Video Source Clock Control and Disable ....................................................................
9.6.6 PWM Control ....................................................................................................
9.6.7 EDMA3 Transfer Controller (EDMA3TC) Burst Size Configuration ......................................
9.6.8 ARM Memory Wait State Control .............................................................................
Bandwidth Management ................................................................................................
9.7.1 Bus Master DMA Priority Control .............................................................................
Emulation Control ........................................................................................................
9.8.1 Set Emulator Suspend Source ................................................................................
Clock and Oscillator Control ............................................................................................
System Control Register Descriptions ................................................................................
102
102
103
103
103
103
103
103
103
104
104
104
104
104
104
104
104
104
104
105
105
105
106
106
106
107
Reset
.............................................................................................................................. 109
10.1
10.2
Reset Overview .......................................................................................................... 110
Reset Pins ................................................................................................................ 110
SPRUEP9E – August 2010
Contents
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10.3
10.4
Types of Reset ...........................................................................................................
10.3.1 Power-On Reset (POR) .......................................................................................
10.3.2 Warm Reset ....................................................................................................
10.3.3 Maximum (Max) Reset ........................................................................................
10.3.4 System Reset ...................................................................................................
10.3.5 Module Reset ...................................................................................................
10.3.6 DSP Local Reset ...............................................................................................
10.3.7 Test and Emulation Reset (TRST pin) ......................................................................
Default Device Configurations ..........................................................................................
10.4.1 Device Configuration Pins ....................................................................................
10.4.2 PLL and Clock Configuration .................................................................................
10.4.3 ARM Boot Mode Configuration ...............................................................................
10.4.4 EMIFA Configuration ..........................................................................................
10.4.5 PCI Enable (PCIEN) Operation ..............................................................................
10.4.6 DSP Boot Mode (DSP_BT) Configuration ..................................................................
111
111
111
112
112
112
112
113
113
113
115
115
116
117
117
A
..................................................................................................................... 119
ARM-DSP Integration ....................................................................................................... 121
12.1 Introduction ............................................................................................................... 122
12.2 Shared Peripherals ...................................................................................................... 122
12.3 Shared Memory .......................................................................................................... 124
12.3.1 ARM Internal Memories ....................................................................................... 124
12.3.2 DSP Memories ................................................................................................. 124
12.3.3 External Memories ............................................................................................. 124
12.4 ARM-DSP Interrupts ..................................................................................................... 125
12.5 ARM Control of DSP Boot, Clock, and Reset ........................................................................ 126
12.5.1 DSP Boot ....................................................................................................... 126
12.5.2 DSP Module Clock ON/OFF .................................................................................. 127
12.5.3 DSP Reset ...................................................................................................... 128
Revision History .............................................................................................................. 131
6
Contents
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12
Boot Modes
SPRUEP9E – August 2010
Copyright © 2010, Texas Instruments Incorporated
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List of Figures
1-1.
TMS320DM6467 DMSoC Block Diagram .............................................................................. 14
2-1.
TMS320DM646x DMSoC ARM Subsystem Block Diagram ......................................................... 17
3-1.
TCM Status Register ...................................................................................................... 26
3-2.
TCM Region Setup Register ............................................................................................. 27
5-1.
PLL1 and PLL2 Clock Domain Block Diagram ........................................................................ 37
5-2.
PLL1 Structure in the TMS320DM646x DMSoC ...................................................................... 38
5-3.
PLL2 Structure in TMS320DM646x DMSoC ........................................................................... 41
5-4.
Peripheral ID Register (PID) ............................................................................................. 46
5-5.
Reset Type Status Register (RSTYPE)
5-6.
PLL Control Register (PLLCTL) ......................................................................................... 47
5-7.
PLL Multiplier Control Register (PLLM)................................................................................. 48
5-8.
PLL Controller Divider 1 Register (PLLDIV1) .......................................................................... 48
5-9.
PLL Controller Divider 2 Register (PLLDIV2)
49
5-10.
PLL Controller Divider 3 Register (PLLDIV3)
50
5-11.
5-12.
5-13.
5-14.
5-15.
5-16.
5-17.
5-18.
5-19.
6-1.
6-2.
6-3.
6-4.
6-5.
6-6.
6-7.
6-8.
6-9.
6-10.
6-11.
6-12.
6-13.
6-14.
8-1.
8-2.
8-3.
8-4.
8-5.
8-6.
8-7.
8-8.
8-9.
8-10.
................................................................................
.........................................................................
.........................................................................
Bypass Divider Register (BPDIV) .......................................................................................
PLL Controller Command Register (PLLCMD) ........................................................................
PLL Controller Status Register (PLLSTAT) ............................................................................
PLL Controller Clock Align Control Register (ALNCTL) ..............................................................
PLLDIV Ratio Change Status Register (DCHANGE) .................................................................
Clock Enable Control Register (CKEN).................................................................................
Clock Status Register (CKSTAT) ........................................................................................
SYSCLK Status Register (SYSTAT) ....................................................................................
PLL Controller Divider n Register (PLLDIVn) ..........................................................................
TMS320DM646x DMSoC Power and Sleep Controller (PSC) ......................................................
TMS320DM646x DMSoC Power Domain and Module Topology ...................................................
Peripheral Revision and Class Information Register (PID) ..........................................................
Interrupt Evaluation Register (INTEVAL) ...............................................................................
Module Error Pending Register 0 (MERRPR0) ........................................................................
Module Error Pending Register 1 (MERRPR1) ........................................................................
Module Error Clear Register 0 (MERRCR0) ...........................................................................
Module Error Pending Register 1 (MERRCR1) .......................................................................
Power Domain Transition Command Register (PTCMD) ............................................................
Power Domain Transition Status Register (PTSTAT) ................................................................
Power Domain Status Register (PDSTAT0) ...........................................................................
Power Domain Control Register (PDCTL0) ............................................................................
Module Status n Register (MDSTATn) .................................................................................
Module Control n Register (MDCTLn) ..................................................................................
AINTC Functional Diagram ..............................................................................................
Interrupt Entry Table .....................................................................................................
Immediate Interrupt Disable/Enable.....................................................................................
Delayed Interrupt Disable ................................................................................................
Fast Interrupt Request Status Register 0 (FIQ0) ......................................................................
Fast Interrupt Request Status Register 1 (FIQ1) ......................................................................
Interrupt Request Status Register 0 (IRQ0)............................................................................
Interrupt Request Status Register 1 (IRQ1)............................................................................
Fast Interrupt Request Entry Address Register (FIQENTRY) .......................................................
Interrupt Request Entry Address Register (IRQENTRY) .............................................................
SPRUEP9E – August 2010
List of Figures
Copyright © 2010, Texas Instruments Incorporated
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53
54
56
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57
58
60
61
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75
86
87
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90
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92
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8
8-11.
Interrupt Enable Register 0 (EINT0) .................................................................................... 93
8-12.
Interrupt Enable Register 1 (EINT1) .................................................................................... 93
8-13.
Interrupt Operation Control Register (INTCTL) ........................................................................ 94
8-14.
Interrupt Entry Table Base Address Register (EABASE) ............................................................ 95
8-15.
Interrupt Priority Register 0 (INTPRI0) .................................................................................. 96
8-16.
Interrupt Priority Register 1 (INTPRI1) .................................................................................. 96
8-17.
Interrupt Priority Register 2 (INTPRI2) .................................................................................. 97
8-18.
Interrupt Priority Register 3 (INTPRI3) .................................................................................. 97
8-19.
Interrupt Priority Register 4 (INTPRI4) .................................................................................. 98
8-20.
Interrupt Priority Register 5 (INTPRI5) .................................................................................. 98
8-21.
Interrupt Priority Register 6 (INTPRI6) .................................................................................. 99
8-22.
Interrupt Priority Register 7 (INTPRI7) .................................................................................. 99
10-1.
Boot Configuration Register (BOOTCFG) ............................................................................ 113
10-2.
ARM Boot Configuration Register (ARMBOOT) ..................................................................... 115
12-1.
ARM-DSP Integration
...................................................................................................
List of Figures
123
SPRUEP9E – August 2010
Copyright © 2010, Texas Instruments Incorporated
www.ti.com
List of Tables
3-1.
Exception Vector Table for ARM ........................................................................................ 22
3-2.
Different Address Types in ARM System
3-3.
3-4.
3-5.
3-6.
5-1.
5-2.
5-3.
5-4.
5-5.
5-6.
5-7.
5-8.
5-9.
5-10.
5-11.
5-12.
5-13.
5-14.
5-15.
5-16.
5-17.
5-18.
5-19.
5-20.
6-1.
6-2.
6-3.
6-4.
6-5.
6-6.
6-7.
6-8.
6-9.
6-10.
6-11.
6-12.
6-13.
6-14.
6-15.
6-16.
6-17.
6-18.
7-1.
8-1.
8-2.
..............................................................................
ITCM/DTCM Memory Map ...............................................................................................
TCM Status Register Field Descriptions ...............................................................................
TCM Region Setup Register Field Descriptions .......................................................................
ITCM/DTCM Size Encoding ..............................................................................................
PLLC1 Output Clocks .....................................................................................................
PLLC2 Output Clock ......................................................................................................
PLL and Reset Controller Module Instance Table ....................................................................
PLL and Reset Controller Registers ....................................................................................
Peripheral ID Register (PID) Field Descriptions .......................................................................
Reset Type Status Register (RSTYPE) Field Descriptions ..........................................................
PLL Control Register (PLLCTL) Field Descriptions ...................................................................
PLL Multiplier Control Register (PLLM) Field Descriptions ..........................................................
PLL Controller Divider 1 Register (PLLDIV1) Field Descriptions....................................................
PLL Controller Divider 2 Register (PLLDIV2) Field Descriptions....................................................
PLL Controller Divider 3 Register (PLLDIV3) Field Descriptions....................................................
Bypass Divider Register (BPDIV) Field Descriptions .................................................................
PLL Controller Command Register (PLLCMD) Field Descriptions ..................................................
PLL Controller Status Register (PLLSTAT) Field Descriptions ......................................................
PLL Controller Clock Align Control Register (ALNCTL) Field Descriptions ........................................
PLLDIV Ratio Change Status Register (DCHANGE) Field Descriptions...........................................
Clock Enable Control Register (CKEN) Field Descriptions ..........................................................
Clock Status Register (CKSTAT) Field Descriptions .................................................................
SYSCLK Status Register (SYSTAT) Field Descriptions ..............................................................
PLL Controller Divider n Register (PLLDIVn) Field Descriptions....................................................
Module Configuration .....................................................................................................
Module States ..............................................................................................................
IcePick Emulation Commands ...........................................................................................
PSC Interrupt...............................................................................................................
PSC Interrupt Events .....................................................................................................
Power and Sleep Controller (PSC) Registers .........................................................................
Peripheral Revision and Class Information Register (PID) Field Descriptions ....................................
Interrupt Evaluation Register (INTEVAL) Field Descriptions ........................................................
Module Error Pending Register 0 (MERRPR0) Field Descriptions .................................................
Module Error Pending Register 1 (MERRPR1) Field Descriptions .................................................
Module Error Clear Register 0 (MERRCR0) Field Descriptions .....................................................
Module Error Clear Register 1 (MERRCR1) Field Descriptions .....................................................
Power Domain Transition Command Register (PTCMD) Field Descriptions ......................................
Power Domain Transition Status Register (PTSTAT) Field Descriptions ..........................................
Power Domain Status Register (PDSTAT0) Field Descriptions .....................................................
Power Domain Control Register (PDCTL0) Field Descriptions ......................................................
Module Status n Register (MDSTATn) Field Descriptions ...........................................................
Module Control n Register (MDCTLn) Field Descriptions ............................................................
Power Management Features ...........................................................................................
ARM Interrupt Map ........................................................................................................
ARM Interrupt Controller (AINTC) Registers ...........................................................................
SPRUEP9E – August 2010
List of Tables
Copyright © 2010, Texas Instruments Incorporated
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26
26
27
27
39
42
45
45
46
46
47
48
48
49
50
51
51
52
53
54
56
56
57
58
62
63
65
65
65
67
68
68
69
69
70
70
71
71
72
73
74
75
78
85
89
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8-3.
8-4.
8-5.
8-6.
8-7.
8-8.
8-9.
8-10.
8-11.
8-12.
8-13.
8-14.
8-15.
8-16.
8-17.
8-18.
8-19.
8-20.
9-1.
9-2.
9-3.
10-1.
10-2.
10-3.
10-4.
12-1.
12-2.
A-1.
10
............................................... 90
Fast Interrupt Request Status Register 1 (FIQ1) Field Descriptions ............................................... 90
Interrupt Request Status Register 0 (IRQ0) Field Descriptions ..................................................... 91
Interrupt Request Status Register 1 (IRQ1) Field Descriptions ..................................................... 91
Fast Interrupt Request Entry Address Register (FIQENTRY) Field Descriptions ................................. 92
Interrupt Request Entry Address Register (IRQENTRY) Field Descriptions....................................... 92
Interrupt Enable Register 0 (EINT0) Field Descriptions .............................................................. 93
Interrupt Enable Register 1 (EINT1) Field Descriptions .............................................................. 93
Interrupt Operation Control Register (INTCTL) Field Descriptions.................................................. 94
Interrupt Entry Table Base Address Register (EABASE) Field Descriptions ...................................... 95
Interrupt Priority Register 0 (INTPRI0) Field Descriptions ........................................................... 96
Interrupt Priority Register 1 (INTPRI1) Field Descriptions ........................................................... 96
Interrupt Priority Register 2 (INTPRI2) Field Descriptions ........................................................... 97
Interrupt Priority Register 3 (INTPRI3) Field Descriptions ........................................................... 97
Interrupt Priority Register 4 (INTPRI4) Field Descriptions ........................................................... 98
Interrupt Priority Register 5 (INTPRI5) Field Descriptions ........................................................... 98
Interrupt Priority Register 6 (INTPRI6) Field Descriptions ........................................................... 99
Interrupt Priority Register 7 (INTPRI7) Field Descriptions ........................................................... 99
TMS320DM646x DMSoC Master IDs ................................................................................. 105
TMS320DM646x DMSoC Default Master Priorities ................................................................. 106
System Control Registers ............................................................................................... 107
Reset Types .............................................................................................................. 110
Reset Pins ................................................................................................................ 110
Boot Configuration Register (BOOTCFG) Field Descriptions ...................................................... 114
ARM Boot Configuration Register (ARMBOOT) Field Descriptions ............................................... 116
ARM-DSP Interrupt Mapping ........................................................................................... 125
DSP Boot Configuration ................................................................................................. 126
Document Revision History ............................................................................................. 131
Fast Interrupt Request Status Register 0 (FIQ0) Field Descriptions
List of Tables
SPRUEP9E – August 2010
Copyright © 2010, Texas Instruments Incorporated
Preface
SPRUEP9E – August 2010
Read This First
About This Manual
This document describes the ARM subsystem in the TMS320DM646x Digital Media System-on-Chip
(DMSoC).
Notational Conventions
This document uses the following conventions.
• Hexadecimal numbers are shown with the suffix h. For example, the following number is 40
hexadecimal (decimal 64): 40h.
• Registers in this document are shown in figures and described in tables.
– Each register figure shows a rectangle divided into fields that represent the fields of the register.
Each field is labeled with its bit name, its beginning and ending bit numbers above, and its
read/write properties below. A legend explains the notation used for the properties.
– Reserved bits in a register figure designate a bit that is used for future device expansion.
Related Documentation From Texas Instruments
The following documents describe the TMS320DM646x Digital Media System-on-Chip (DMSoC). Copies
of these documents are available on the Internet at www.ti.com. Tip: Enter the literature number in the
search box provided at www.ti.com.
The current documentation that describes the DM646x DMSoC, related peripherals, and other technical
collateral, is available in the C6000 DSP product folder at: www.ti.com/c6000.
SPRUEP8 — TMS320DM646x DMSoC DSP Subsystem Reference Guide. Describes the digital signal
processor (DSP) subsystem in the TMS320DM646x Digital Media System-on-Chip (DMSoC).
SPRUEQ0 — TMS320DM646x DMSoC Peripherals Overview Reference Guide. Provides an overview
and briefly describes the peripherals available on the TMS320DM646x Digital Media
System-on-Chip (DMSoC).
SPRAA84 — TMS320C64x to TMS320C64x+ CPU Migration Guide. Describes migrating from the
Texas Instruments TMS320C64x digital signal processor (DSP) to the TMS320C64x+ DSP. The
objective of this document is to indicate differences between the two cores. Functionality in the
devices that is identical is not included.
SPRU732 — TMS320C64x/C64x+ DSP CPU and Instruction Set Reference Guide. Describes the CPU
architecture, pipeline, instruction set, and interrupts for the TMS320C64x and TMS320C64x+ digital
signal processors (DSPs) of the TMS320C6000 DSP family. The C64x/C64x+ DSP generation
comprises fixed-point devices in the C6000 DSP platform. The C64x+ DSP is an enhancement of
the C64x DSP with added functionality and an expanded instruction set.
SPRU871 — TMS320C64x+ DSP Megamodule Reference Guide. Describes the TMS320C64x+ digital
signal processor (DSP) megamodule. Included is a discussion on the internal direct memory access
(IDMA) controller, the interrupt controller, the power-down controller, memory protection, bandwidth
management, and the memory and cache.
SPRU656 — TMS320C6000 DSP Cache User's Guide. Explains the fundamentals of memory caches
and describes how the two-level cache-based internal memory architecture in the
TMS320C621x/C671x/C64x digital signal processors (DSPs) of the TMS320C6000 DSP family can
be efficiently used in DSP applications. Shows how to maintain coherence with external memory,
how to use DMA to reduce memory latencies, and how to optimize your code to improve cache
SPRUEP9E – August 2010
Read This First
Copyright © 2010, Texas Instruments Incorporated
11
Related Documentation From Texas Instruments
www.ti.com
efficiency. The internal memory architecture in the C621x/C671x/C64x DSPs is organized in a
two-level hierarchy consisting of a dedicated program cache (L1P) and a dedicated data cache
(L1D) on the first level. Accesses by the CPU to the these first level caches can complete without
CPU pipeline stalls. If the data requested by the CPU is not contained in cache, it is fetched from
the next lower memory level, L2 or external memory.
SPRU862 — TMS320C64x+ DSP Cache User's Guide. Explains the fundamentals of memory caches
and describes how the two-level cache-based internal memory architecture in the TMS320C64x+
digital signal processor (DSP) of the TMS320C6000 DSP family can be efficiently used in DSP
applications. Shows how to maintain coherence with external memory, how to use DMA to reduce
memory latencies, and how to optimize your code to improve cache efficiency. The internal memory
architecture in the C64x+ DSP is organized in a two-level hierarchy consisting of a dedicated
program cache (L1P) and a dedicated data cache (L1D) on the first level. Accesses by the CPU to
the these first level caches can complete without CPU pipeline stalls. If the data requested by the
CPU is not contained in cache, it is fetched from the next lower memory level, L2 or external
memory.
12
Read This First
SPRUEP9E – August 2010
Copyright © 2010, Texas Instruments Incorporated
Chapter 1
SPRUEP9E – August 2010
Introduction
Topic
1.1
1.2
...........................................................................................................................
Page
Overview .......................................................................................................... 14
ARM Subsystem in TMS320DM646x DMSoC ......................................................... 14
SPRUEP9E – August 2010
Introduction
Copyright © 2010, Texas Instruments Incorporated
13
Overview
1.1
www.ti.com
Overview
The TMS320DM646x Digital Media System-on-Chip (DMSoC) contains two primary CPU cores: 1) an
ARM RISC CPU for general purpose processing and systems control and 2) a powerful DSP to efficiently
handle image, video, and audio processing tasks. The DMSoC consists of the following primary
components and sub-systems:
• ARM Subsystem (ARMSS), including the ARM926 RISC CPU core and associated memories
• DSP Subsystem (DSPSS), including the C64x+ DSP and associated memories
• Two programmable High-Definition Video Image Coprocessors (HDVICP)
• Video Data Conversion Engine (VDCE)
• Video Port Interface (VPIF)
• A set of I/O peripherals
• A powerful DMA Subsystem and DDR2 memory controller interface
An example block diagram (for the TMS320DM6467 DMSoC) is shown in Figure 1-1.
1.2
ARM Subsystem in TMS320DM646x DMSoC
The ARM926EJ 32-bit RISC processor in the ARMSS acts as the overall system controller. The ARM
CPU performs general system control tasks, such as system initialization, configuration, power
management, user interface, and user command implementation. Chapter 2 describes the ARMSS
components and system control functions that the ARM core performs.
Figure 1-1. TMS320DM6467 DMSoC Block Diagram
JTAG Interface
System Control
ARM Subsystem
DSP Subsystem
PLLs/Clock
Generator
ARM926EJ-S CPU
C64x+ t DSP CPU
Input
Clock(s)
Power/Sleep
Controller
16 KB
I-Cache
32 KB RAM
Pin
Multiplexing
128 KB L2 RAM
8 KB
D-Cache
32 KB
L1 Pgm
32 KB
L1 Data
8 KB ROM
High Definition
Video-Imaging
Coprocessor
(HDVICP0)
High Definition
Video-Imaging
Coprocessor
(HDVICP1)
Switched Central Resource (SCR)
Peripherals
Serial Interfaces
EDMA
CRGEN
McASP
I2 C
SPI
System
GeneralPurpose
Timer
UART
14
PWM
VDCE
Connectivity
TSIF
Watchdog
Timer
Video
Port I/F
PCI
(33 MHz)
USB 2.0
PHY
Program/Data Storage
VLYNQ
EMAC
With
MDIO
HPI
DDR2
Mem Ctlr
(16b/32b)
Introduction
Async EMIF/
NAND/
SmartMedia
ATA
SPRUEP9E – August 2010
Copyright © 2010, Texas Instruments Incorporated
Chapter 2
SPRUEP9E – August 2010
ARM Subsystem Overview
Topic
2.1
2.2
2.3
...........................................................................................................................
Page
Purpose of the ARM Subsystem .......................................................................... 16
Components of the ARM Subsystem ................................................................... 16
References ....................................................................................................... 17
SPRUEP9E – August 2010
ARM Subsystem Overview
Copyright © 2010, Texas Instruments Incorporated
15
Purpose of the ARM Subsystem
2.1
www.ti.com
Purpose of the ARM Subsystem
The ARM Subsystem contains the components required to provide the ARM926EJ-S (ARM) master
control of the TMS320DM646x DMSoC system. In general, the ARM is responsible for configuration and
control of the overall DM646x DMSoC system, including the DSP Subsystem and a majority of the
peripherals and external memories.
In the DMSoC, the ARM is responsible for handling system functions such as system-level initialization,
configuration, user interface, user command execution, connectivity functions, interface and control of the
DSP Subsystem, and overall system control. The ARM performs these functions because it has a larger
program memory space and better context switching capability, and is thus more suitable for complex,
multi-tasking, and general-purpose control tasks than the DSP.
2.2
Components of the ARM Subsystem
The ARM Subsystem (ARMSS) in the DM646x DMSoC consists of the following components:
• ARM926EJ-S RISC processor, including:
– Co-Processor 15 (CP15)
– MMU
– 16KB Instruction cache and 8KB Data cache
– Write Buffer
• ARM Internal Memories
– 32 KB Internal RAM (32-bit wide access)
– 8 KB Internal ROM (ARM bootloader for non-EMIFA boot options)
• Embedded Trace Module and Embedded Trace Buffer (ETM/ETB)
• System Control Peripherals
– ARM Interrupt Controller
– PLL Controller
– Power and Sleep Controller
– System Module
The ARM also manages/controls the following peripherals:
• Asynchronous EMIF (EMIFA), including the NAND flash interface
• ATA Controller
• Clock Reference Generator (CRGEN)
• DDR2 Memory Controller
• Enhanced DMA (EDMA) System - Channel Controller (CC) and Transfer Controllers (TCs)
• Ethernet Media Access Controller (EMAC)
• General-Purpose Input/Output (GPIO)
• Host Port Interface (HPI)
• Inter-IC Communication (I2C)
• Multichannel Audio Serial Port (McASP)
• Peripheral Component Interface (PCI)
• Pulse Width Modulator (PWM)
• Serial Port Interface (SPI)
• Timers
• Transport Stream Interface (TSIF)
• Universal Asynchronous Receiver/Transmitter (UART)
• Universal Serial Bus (USB) Controller
• Video Data Conversion Engine (VDCE)
• VLYNQ Interface
• Video Port Interface (VPIF)
Figure 2-1 shows the functional block diagram of the DM646x DMSoC ARM Subsystem.
16
ARM Subsystem Overview
SPRUEP9E – August 2010
Copyright © 2010, Texas Instruments Incorporated
References
www.ti.com
The DM646x DMSoC architecture uses two primary bus subsystems to transfer data within the system:
•
•
The DMA bus (sometimes called data bus) is used for data transfer between subsystems and
modules.
The CFG bus (or configuration bus) is used to read/write to peripheral registers in various modules for
configuration.
Figure 2-1. TMS320DM646x DMSoC ARM Subsystem Block Diagram
Master I/F
ARM
interrupt
controller
(AINTC)
Master I/F
I-AHB
D-AHB
ARM926EJ-S
16K RAM0
16K RAM1
16K I$
CP15
8K D$
MMU
System
control
Slave-I/F
8K ROM
GFC bus
DMA bus
I-TCM
D-TCM
PLL0
PLL1
Power
sleep
controller
(PSC)
Peripherals
2.3
References
See the following DM646x DMSoC related documents for more information:
• For related documentation about the DM646x DMSoC other than the ARM core, see the Related
Documentation section at the beginning of this document.
• For more detailed information about the ARM processor core, see ARM Ltd.’s web site (particularly,
see the ARM926EJ-S Technical Reference Manual):
– http://www.arm.com/documentation/ARMProcessor_Cores/index.html
SPRUEP9E – August 2010
ARM Subsystem Overview
Copyright © 2010, Texas Instruments Incorporated
17
18
ARM Subsystem Overview
SPRUEP9E – August 2010
Copyright © 2010, Texas Instruments Incorporated
Chapter 3
SPRUEP9E – August 2010
ARM Core
Topic
3.1
3.2
3.3
3.4
3.5
3.6
3.7
...........................................................................................................................
Introduction ......................................................................................................
Operating States/Modes .....................................................................................
Processor Status Registers ................................................................................
Exceptions and Exception Vectors ......................................................................
The 16-BIS/32-BIS Concept .................................................................................
Co-Processor 15 (CP15) .....................................................................................
Tightly-Coupled Memory ....................................................................................
SPRUEP9E – August 2010
ARM Core
Copyright © 2010, Texas Instruments Incorporated
Page
20
21
21
22
23
24
26
19
Introduction
3.1
www.ti.com
Introduction
This chapter describes the ARM core and its associated memories. The ARM core consists of the
following components:
• ARM926EJ-S - 32-bit RISC processor
• 16-KB Instruction cache
• 8-KB Data cache
• Memory Management Unit (MMU)
• CP15 to control MMU, cache, etc.
• Java accelerator
• ARM Internal Memory
– 32 KB built-in RAM
– 8 KB built-in ROM (boot ROM)
• Embedded Trace Module and Embedded Trace Buffer (ETM/ETB)
• Features:
– The main write buffer has a 16-word data buffer and a 4-address buffer
– Support for 32/16-bit instruction sets
– Fixed little endian memory format
– Enhanced DSP instructions
The ARM926EJ-S processor is a member of the ARM9 family of general-purpose microprocessors. The
ARM926EJ-S processor targets multi-tasking applications where full memory management, high
performance, low die size, and low power are all important.
The ARM926EJ-S processor supports the 32-bit ARM and the 16-bit THUMB instruction sets, enabling
you to trade off between high performance and high code density. This includes features for efficient
execution of Java byte codes and providing Java performance similar to Just in Time (JIT) Java interpreter
without associated code overhead.
The ARM926EJ-S processor supports the ARM debug architecture and includes logic to assist in both
hardware and software debugging. The ARM926EJ-S processor has a Harvard architecture and provides
a complete high performance subsystem, including the following:
• An ARM926EJ-S integer core
• A Memory Management Unit (MMU)
• Separate instruction and data AMBA AHB bus interfaces
• Separate instruction and data TCM interfaces
The ARM926EJ-S processor implements ARM architecture version 5TEJ.
The ARM926EJ-S core includes new signal processing extensions to enhance 16-bit fixed-point
performance using a single-cycle 32 × 16 multiply-accumulate (MAC) unit. The ARM Subsystem also has
32 KB of internal RAM and 8 KB of internal ROM, accessible via the I-TCM and D-TCM interfaces through
an arbiter. The same arbiter provides a slave DMA interface to the rest of the DM646x DMSoC.
Furthermore, the ARM has DMA and CFG bus master ports via the AHB interface.
20
ARM Core
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Copyright © 2010, Texas Instruments Incorporated
Operating States/Modes
www.ti.com
3.2
Operating States/Modes
The ARM can operate in two states: ARM (32-bit) mode and Thumb (16-bit) mode. You can switch the
ARM926EJ-S processor between ARM mode and Thumb mode using the BX instruction.
The ARM can operate in the following modes:
• User mode (USR): Non-privileged mode, usually for the execution of most application programs.
• Fast interrupt mode (FIQ): Fast interrupt processing
• Interrupt mode (IRQ): Normal interrupt processing
• Supervisor mode (SVC): Protected mode of execution for operating systems
• Abort mode (ABT): Mode of execution after a data abort or a pre-fetch abort
• System mode (SYS): Privileged mode of execution for operating systems
• Undefined mode (UND): Executing an undefined instruction causes the ARM to enter undefined mode.
You can only enter privileged modes (system or supervisor) from other privileged modes.
To enter supervisor mode from user mode, generate a software interrupt (SWI). An IRQ interrupt causes
the processor to enter the IRQ mode. An FIQ interrupt causes the processor to enter the FIQ mode.
Different stacks must be set up for different modes. The stack pointer (SP) automatically changes to the
SP of the mode that was entered.
3.3
Processor Status Registers
The processor status register (PSR) controls the enabling and disabling of interrupts and setting the mode
of operation of the processor. The 8 least-significant bits, PSR[7:0], are the control bits of the processor.
PSR[27:8] are reserved bits and PSR[31:28] are status bits. The details of the control bits are:
• Bit 7 - I bit: Disable IRQ (I =1) or enable IRQ (I = 0)
• Bit 6 - F bit: Disable FIQ (F = 1) or enable FIQ (F = 0)
• Bit 5 - T bit: Controls whether the processor is in thumb mode (T = 1) or ARM mode (T = 0)
• Bits 4:0 Mode: Controls the mode of operation of the processor
– PSR [4:0] = 10000 : User mode
– PSR [4:0] = 10001 : FIQ mode
– PSR [4:0] = 10010 : IRQ mode
– PSR [4:0] = 10011 : Supervisor mode
– PSR [4:0] = 10111 : Abort mode
– PSR [4:0] = 11011 : Undefined mode
– PSR [4:0] = 11111 : System mode
Status bits show the result of the most recent ALU operation. The details of the status bits are:
• Bit 31 - N bit: Negative or less than
• Bit 30 - Z bit: Zero
• Bit 29 - C bit: Carry or borrow
• Bit 28 - V bit: Overflow or underflow
NOTE: See Chapter 2 of the Programmer’s Model of the ARM926EJ-S TRM, downloadable from
http://www.arm.com/arm/TRMs for more detailed information.
SPRUEP9E – August 2010
ARM Core
Copyright © 2010, Texas Instruments Incorporated
21
Exceptions and Exception Vectors
3.4
www.ti.com
Exceptions and Exception Vectors
Exceptions arise when the normal flow of the program must be temporarily halted. The exceptions that
occur in an ARM system are given below:
• Reset exception: processor reset
• FIQ interrupt: fast interrupt
• IRQ interrupt: normal interrupt
• Abort exception: abort indicates that the current memory access could not be completed. The abort
could be a pre-fetch abort or a data abort.
• SWI interrupt: use software interrupt to enter supervisor mode.
• Undefined exception: occurs when the processor executes an undefined instruction
The exceptions in the order of highest priority to lowest priority are: reset, data abort, FIQ, IRQ, pre-fetch
abort, undefined instruction, and SWI. SWI and undefined instruction have the same priority. Depending
upon the status of VINTH signal or the register setting in CP15, the vector table can be located at address
0000 0000h (VINTH = 0) or at address FFFF 0000h (VINTH = 1).
NOTE: This is a feature of the standard ARM9 code. However, there is no memory in the DMSoC
in this address region, so do not set this bit.
The default vector table is shown in Table 3-1.
Table 3-1. Exception Vector Table for ARM
22
Vector Offset Address
Exception
Mode on entry
I Bit State on Entry
0h
Reset
Supervisor
Set
F Bit State on Entry
Set
4h
Undefined instruction
Undefined
Set
Unchanged
8h
Software interrupt
Supervisor
Set
Unchanged
Ch
Pre-fetch abort
Abort
Set
Unchanged
10h
Data abort
Abort
Set
Unchanged
14h
Reserved
-
-
-
18h
IRQ
IRQ
Set
Unchanged
1Ch
FIQ
FIQ
Set
Set
ARM Core
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Copyright © 2010, Texas Instruments Incorporated
The 16-BIS/32-BIS Concept
www.ti.com
3.5
The 16-BIS/32-BIS Concept
The key idea behind 16-BIS is that of a super-reduced instruction set. Essentially, the ARM926EJ
processor has two instruction sets:
• ARM mode or 32-BIS: the standard 32-bit instruction set
• Thumb mode or 16-BIS: a 16-bit instruction set
The 16-bit instruction length (16-BIS) allows the 16-BIS to approach twice the density of standard 32-BIS
code while retaining most of the 32-BIS’s performance advantage over a traditional 16-bit processor using
16-bit registers. This is possible because 16-BIS code operates on the same 32-bit register set as 32-BIS
code. 16-bit code can provide up to 65% of the code size of the 32-bit code and 160% of the performance
of an equivalent 32-BIS processor connected to a 16-bit memory system.
3.5.1 16-BIS/32-BIS Advantages
16-bit instructions operate with the standard 32-bit register configuration, allowing excellent
inter-operability between 32-BIS and 16-BIS states. Each 16-bit instruction has a corresponding 32-bit
instruction with the same effect on the processor model. The major advantage of a 32-bit architecture over
a 16-bit architecture is its ability to manipulate 32-bit integers with single instructions, and to address a
large address space efficiently. When processing 32-bit data, a 16-bit architecture takes at least two
instructions to perform the same task as a single 32-bit instruction. However, not all of the code in a
program processes 32-bit data (for example, code that performs character string handling), and some
instructions (like branches) do not process any data at all. If a 16-bit architecture only has 16-bit
instructions, and a 32-bit architecture only has 32-bit instructions, then the 16-bit architecture has better
code density overall, and has better than one half of the performance of the 32-bit architecture. Clearly,
32-bit performance comes at the cost of code density. The 16-bit instruction breaks this constraint by
implementing a 16-bit instruction length on a 32-bit architecture, making the processing of 32-bit data
efficient with compact instruction coding. This provides far better performance than a 16-bit architecture,
with better code density than a 32-bit architecture. The 16-BIS also has a major advantage over other
32-bit architectures with 16-bit instructions. The advantage is the ability to switch back to full 32-bit code
and execute at full speed. Thus, critical loops for applications such as fast interrupts and DSP algorithms
can be coded using the full 32-BIS and linked with 16-BIS code. The overhead of switching from 16-bit
code to 32-bit code is folded into sub-routine entry time. Various portions of a system can be optimized for
speed or for code density by switching between 16-BIS and 32-BIS execution, as appropriate.
SPRUEP9E – August 2010
ARM Core
Copyright © 2010, Texas Instruments Incorporated
23
Co-Processor 15 (CP15)
3.6
www.ti.com
Co-Processor 15 (CP15)
The system control coprocessor (CP15) is used to configure and control instruction and data caches,
Tightly-Coupled Memories (TCMs), Memory Management Units (MMUs), and many system functions. The
CP15 registers are only accessible with MRC and MCR instructions by the ARM in a privileged mode like
supervisor mode or system mode.
3.6.1 Addresses in an ARM926EJ-S System
Three different types of addresses exist in an ARM926EJ-S system. They are as follows:
Table 3-2. Different Address Types in ARM System
Domain
ARM9EJ-S
Caches and MMU
TCM and AMBA Bus
Address type
Virtual Address (VA)
Modified Virtual Address (MVA)
Physical Address (PA)
An example of the address manipulation that occurs when the ARM9EJ-S core requests an instruction is
shown in Example 3-1.
Example 3-1. Address Manipulation
The VA of the instruction is issued by the ARM9EJ-S core.
The VA is translated to the MVA. The Instruction Cache (Icache) and Memory Management Unit (MMU) detect
the MVA.
If the protection check carried out by the MMU on the MVA does not abort and the MVA tag is in the Icache,
the instruction data is returned to the ARM9EJ-S core.
If the protection check carried out by the MMU on the MVA does not abort, and the MVA tag is not in the
cache, then the MMU translates the MVA to produce the PA.
NOTE: See Chapter 2 of the Programmers Model of the ARM926EJ-S TRM, downloadable from
http://www.arm.com/arm/TRMs for more detailed information.
3.6.2 Memory Management Unit (MMU)
The ARM926EJ-S MMU provides virtual memory features required by operating systems such as
SymbianOS, WindowsCE, and Linux. A single set of two level page tables stored in main memory controls
the address translation, permission checks, and memory region attributes for both data and instruction
accesses. The MMU uses a single unified Translation Lookaside Buffer (TLB) to cache the information
held in the page tables.
The MMU features are as follows:
• Standard ARM architecture v4 and v5 MMU mapping sizes, domains, and access protection scheme.
• Mapping sizes are 1 MB (sections), 64 KB (large pages), 4 KB (small pages) and 1 KB (tiny pages)
• Access permissions for large pages and small pages can be specified separately for each quarter of
the page (subpage permissions)
• Hardware page table walks
• Invalidate entire TLB, using CP15 register 8
• Invalidate TLB entry, selected by MVA, using CP15 register 8
• Lockdown of TLB entries, using CP15 register 10
NOTE: See Chapter 3 of the Memory Management Unit of the ARM926EJ-S TRM, downloadable
from http://www.arm.com/arm/TRMs for more detailed information.
24
ARM Core
SPRUEP9E – August 2010
Copyright © 2010, Texas Instruments Incorporated
Co-Processor 15 (CP15)
www.ti.com
3.6.3 Caches and Write Buffer
The ARM926EJ-S processor includes:
• An Instruction cache (Icache)
• A Data cache (Dcache)
• A write buffer
The size of the data cache is 8 KB, instruction cache is 16 KB, and write buffer is 17 bytes.
The caches have the following features:
• Virtual index, virtual tag, addressed using the Modified Virtual Address (MVA)
• Four-way set associative, with a cache line length of eight words per line (32 bytes per line), and two
dirty bits in the Dcache
• Dcache supports write-through and write-back (or copy back) cache operation, selected by memory
region using the C and B bits in the MMU translation tables
• Perform critical-word first cache refilling
• Cache lockdown registers enable control over which cache ways are used for allocation on a line fill,
providing a mechanism for both lockdown and controlling cache pollution.
• Dcache stores the Physical Address TAG (PA TAG) corresponding to each Dcache entry in the
TAGRAM for use during the cache line write-backs, in addition to the Virtual Address TAG stored in the
TAG RAM. This means that the MMU is not involved in Dcache write-back operations, removing the
possibility of TLB misses related to the write-back address.
• Cache maintenance operations to provide efficient invalidation of the following:
– The entire Dcache or Icache
– Regions of the Dcache or Icache
– The entire Dcache
– Regions of virtual memory
• They also provide operations for efficient cleaning and invalidation of the following:
– The entire Dcache
– Regions of the Dcache
– Regions of virtual memory
The write buffer is used for all writes to a non-cachable bufferable region, write-through region, and write
misses to a write-back region. A separate buffer is incorporated in the Dcache for holding write-back for
cache line evictions or cleaning of dirty cache lines.
The main write buffer has a 16-word data buffer and a four-address buffer.
The Dcache write-back has eight data word entries and a single address entry.
The MCR drain write buffer enables both write buffers to be drained under software control.
The MCR wait for interrupt causes both write buffers to be drained and the ARM926EJ-S processor to be
put into a low power state until an interrupt occurs.
NOTE: See Chapter 4 of the Caches and Write Buffer of the ARM926EJ-S TRM, downloadable
from http://www.arm.com/arm/TRMs for more detailed information.
SPRUEP9E – August 2010
ARM Core
Copyright © 2010, Texas Instruments Incorporated
25
Tightly-Coupled Memory
3.7
www.ti.com
Tightly-Coupled Memory
The ARM926EJ-S has a tightly-coupled memory interface enabling separate instruction and data TCM to
be interfaced to the ARM. TCMs are meant for storing real-time and performance critical code.
The DM646x DMSoC supports both instruction TCM (I-TCM) and data TCM (D-TCM). The instruction
TCM is located at 0000:0000h to 0000:9FFFh; the data TCM is located at 0001:0000h to 0001:9FFFh, as
shown in Table 3-3.
Table 3-3. ITCM/DTCM Memory Map
I-TCM Address
D-TCM Address
Size (Bytes)
Description
0000:0000h - 0000:3FFFh
0001:0000h - 0001:3FFFh
16K
RAM0
0000:4000h - 0000:7FFFh
0001:4000h - 0001:7FFFh
16K
RAM1
0000:8000h - 0000:9FFFh
0001:8000h - 0001:9FFFh
8K
ROM
0000:A000h - 0000:FFFFh
0001:A000h - 0001:FFFFh
24K
Reserved
The status of the TCM memory regions can be read from the TCM status register, which is CP15 register
0. The instruction for reading the TCM status is:
MRC p15, #0, Rd, c0, c0, #2 ; read TCM status register
where Rd is any register where the status data is read into the register.
The format of the data in the TCM status register is shown in Figure 3-1 and described in Table 3-4.
Figure 3-1. TCM Status Register
31
17
Reserved
15
1
Reserved
16
DTCM
0
ITCM
Table 3-4. TCM Status Register Field Descriptions
Bit
31-17
16
15-1
0
26
Field
Reserved
Value
0
DTCM
Reserved
Description
Reserved
Data TCM.
0
Data TCM is not present.
1
Data TCM is present.
0
Reserved
ITCM
Instruction TCM.
0
Instruction TCM is not present.
1
Instruction TCM is present.
ARM Core
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Copyright © 2010, Texas Instruments Incorporated
Tightly-Coupled Memory
www.ti.com
The format of the data in the TCM region setup register is shown in Figure 3-2 and described in Table 3-5.
Figure 3-2. TCM Region Setup Register
31
16
ADDRESS
15
12
11
6
ADDRESS
5
2
Reserved (000000)
SIZE
1
0
0
ENB
Table 3-5. TCM Region Setup Register Field Descriptions
Bit
Field
Value
31-12
ADDRESS
11-6
Reserved
5-2
SIZE
1
0
0
ENB
Description
0-FFFFFh
0
Base Address. The value programmed in this field is left-shifted by 12 to represent the physical
base address of the memory block (ITCM or DTCM).
Reserved
0-Fh
Memory block size. See Table 3-6.
0
This bits is always 0.
TCM enable.
0
TCM is disabled.
1
TCM is enabled.
Table 3-6. ITCM/DTCM Size Encoding
Binary Code
Size
0000
0 KB / absent
0001 and 0010
Reserved
0011
4 KB
0100
8 KB
0101
16 KB
0110
32 KB
0111
64 KB
1000
128 KB
1001
256 KB
1010
512 KB
1011
1 MB
11xx
Reserved
The instructions for reading and writing to the ITCM and DTCM are:
MRC
MCR
MRC
MCR
p15,
p15,
p15,
p15,
#0,
#0,
#0,
#0,
Rd,
Rd,
Rd,
Rd,
c9,
c9,
c9,
c9,
c1,
c1,
c1,
c1,
#0
#0
#1
#1
;
;
;
;
read DTCM region register
write DTCM region register
read ITCM region register
write ITCM region register
Where Rd is any register where the data is read or written into the register.
On DM646x devices, the base address of the ITCM is 0000 0000h and the size is 32 KB. Hence, the
address field of the ITCM register c9 should be programmed with 00000h. The memory block size field of
the ITCM register c9 is fixed to the value of 6h. The memory block size field of the ITCM register c9 is
read only and a write has no effect.
On DM646x devices, the base address of the DTCM is 0001 0000h and the size is 32 KB. The DM646x
DTCM includes 32 KB of RAM and 8 KB of ROM. The address field of the DTCM register c9 should be
programmed with 0 0010h. The memory block size field of the DTCM register c9 is fixed to the value of
6h. The memory block size field of the DTCM register c9 is read only and a write has no effect.
SPRUEP9E – August 2010
ARM Core
Copyright © 2010, Texas Instruments Incorporated
27
Tightly-Coupled Memory
www.ti.com
Example 3-2. TMS320DM646x ITCM Register c9 Programming
; Read ITCM
MRC p15, #00, R3, c9, c1, #1
NOP
NOP
; Enable ITCM
MOV R0, #0x1;
MCR p15, #00, R0, c9, c1, #1
NOP
NOP
; Read Back the ITCM value to check the ITCM Enable function
MRC p15, #00, R4, c9, c1, #1
NOP
NOP
Example 3-3. TMS320DM646x DTCM Register c9 Programming
DTCM_BASE_ADDR
.word
0x10
; Read DTCM
MRC p15, #00, R3, c9, c1, #0
NOP
NOP
;Create
LDR R0,
MOV R0,
NOP
ORR R0,
ORR R0,
DTCM enable mask
DTCM_BASE_ADDR
R0, LSL #12
R0, #0x1;
R0, R3
; Enable DTCM
MCR p15, #00, R0, c9, c1, #0
NOP
NOP
; Read Back the DTCM value to check the DTCM Enable function
MRC p15, #00, R5, c9, c1, #0
NOP
NOP
NOTE: See Chapter 5 of the Tightly-coupled Memory Interface of the ARM926EJ-S TRM,
downloadable from http://www.arm.com/arm/TRMs for more detailed information.
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Copyright © 2010, Texas Instruments Incorporated
Chapter 4
SPRUEP9E – August 2010
System Memory
Topic
4.1
4.2
...........................................................................................................................
Page
Memory Map ..................................................................................................... 30
Memory Interfaces Overview ............................................................................... 31
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System Memory
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29
Memory Map
4.1
www.ti.com
Memory Map
The TMS320DM646x DMSoC has multiple on-chip memories associated with its two processors and
various subsystems. To help simplify software development, a unified memory map is used where
possible to maintain a consistent view of device resources across all bus masters.
For detailed memory-map information, see the device-specific data manual.
4.1.1 ARM Internal Memories
The ARM has access to the following ARM internal memories:
• 32 KB ARM Internal RAM on TCM interface, logically separated into two 16-KB pages to allow
simultaneous access on any given cycle, if there are separate accesses for code (I-TCM bus) and data
(D-TCM) to the different memory regions.
• 8 KB ARM Internal ROM
4.1.2 External Memories
The ARM has access to the following external memories:
• DDR2 synchronous DRAM
• Asynchronous EMIF / NOR / NAND Flash
• ATA
These memory interfaces are described in Section 1.1.
For documentation related to these interfaces, see the Related Documentation section at the beginning of
this document.
4.1.3 DSP Memories
The ARM has access to the following DSP memories:
• L2 RAM (Level 2 RAM)
• L1P RAM (Level 1 Program RAM)
• L1D RAM (Level 1 Data RAM)
4.1.4 Peripherals
The ARM has access to the following peripherals:
• Asynchronous EMIF (EMIFA)
• ATA Controller
• 2 Clock Reference Generators (CRGEN)
• DDR2 Memory Controller
• Enhanced DMA (EDMA) Controller
• Ethernet Media Access Controller (EMAC)
• General-Purpose Input/Output (GPIO)
• Host Port Interface (HPI)
• Inter-IC Communication (I2C)
• 2 Multichannel Audio Serial Ports (McASP)
• Peripheral Component Interface (PCI)
• 2 Pulse Width Modulators (PWM)
• Serial Port Interface (SPI) up to 40 MHz with 2 chip selects
• 2 timers that are configurable as two 64-bit or four 32-bit timers and one 64-bit watchdog timer
• Transport Stream Interface (TSIF)
• 3 Universal Asynchronous Receiver/Transmitters (UART) (one with modem control)
• Universal Serial Bus (USB) Controller
• Video Data Conversion Engine (VDCE)
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Memory Interfaces Overview
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•
•
VLYNQ Interface
2 Video Port Interfaces (VPIF)
The ARM Subsystem also has access to the following internal peripherals:
• System Module
• PLL Controllers
• Power Sleep Controller (PSC)
• ARM Interrupt Controller (AINTC)
4.2
Memory Interfaces Overview
This section describes the different memory interfaces of DM646x DMSoC. The DM646x DMSoC supports
several memory and external device interfaces, including the following:
• DDR2 synchronous DRAM
• Asynchronous EMIF/NOR/NAND Flash
• ATA
4.2.1 DDR2 Memory Controller
The DDR2 memory controller is a dedicated interface to DDR2 SDRAM. It supports JESD79D-2A
standard compliant DDR2 SDRAM devices and can support either 16-bit or 32-bit interfaces.
DDR2 SDRAM plays a key role in a DM646x DMSoC-based system. Such a system is expected to require
a significant amount of high-speed external memory for the following:
• Buffering input image data from sensors or video sources
• Intermediate buffering for processing/resizing of image data in the video data conversion engine
(VDCE)
• Video processing display buffers
• Buffering for intermediate data while performing video encode and decode functions
• Storage of executable firmware for both the ARM and DSP
4.2.2 External Memory Interface
The DM646x DMSoC external memory interface (EMIF) provides an 8-bit or 16-bit data bus, an address
bus width of up to 24-bits, and 4 dedicated chip selects, along with memory control signals. These signals
are statically multiplexed between four parallel interface modules. The interface modules are:
• EMIF module - providing asynchronous EMIF (EMIFA) and NAND interfaces
• ATA – providing ATA/IDE drive support
• PCI
• HPI
Some of the control signals are configurable as GPIO signals if they are not required by the EMIFA, ATA,
PCI, and HPI. See the device-specific data manual for more information on pin multiplexing.
See the device-specific data manual for more details on pin-muxing.
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31
Memory Interfaces Overview
4.2.2.1
www.ti.com
Asynchronous EMIF (EMIFA)
The asynchronous EMIF (EMIFA) provides both the EMIFA and NAND interfaces. Four chip selects are
provided. Each is individually configurable to provide either EMIFA or NAND support.
• The EMIFA mode supports asynchronous devices (RAM, ROM, and NOR Flash)
• 128MB asynchronous address range over 4 chip selects (32 MB each)
• Supports 8-bit or 16-bit data bus widths
• Programmable asynchronous cycle timings
• Supports extended waits
• Supports Select Strobe mode
• Supports TI DSP HPI interface
• Supports booting DM646x DMSoC ARM processor from CS2 (SRAM/NOR Flash)
4.2.2.2
NAND (NAND, SmartMedia, xD)
The asynchronous EMIF (EMIFA) provides both the EMIFA and NAND interfaces. Four chip selects are
provided and each is individually configurable to provide either EMIFA or NAND support.
• The NAND Mode supports NAND Flash on up to 4 asynchronous chip selects
• Supports 8-bit data bus width
• Programmable cycle timings
• Performs ECC calculation
• NAND Mode also supports SmartMedia/SSFDC (Solid State Floppy Disk Controller) and xD memory
cards
• ARM ROM supports booting of the DM646x DMSoC ARM processor from NAND-Flash located at CS2
4.2.2.3
ATA Controller
The ATA controller provides the following capabilities:
• Supports PIO, multi-word DMA, and Ultra ATA 33/44/66/100
• Supports up to mode 4 timings on PIO mode
• Supports up to mode 2 timings on multi-word DMA
• Supports up to mode 5 timings on Ultra ATA
• Full scatter gather DMA capability
• Single channel capable of connecting up to two ATA/ATAPI devices
• Programmable timing features enable timing parameters to be reprogrammed to support any ATA
timing mode at any clock frequency
Additionally, the Host IDE Controller supports multi-word DMA and Ultra DMA data transfers between
external IDE/ATAPI devices and a system memory bus interface. The timing and control registers in this
core are compatible to the Intel register set in the PIIX family.
This core has a full scatter gather DMA capability, which is compatible with the Intel scatter gather DMA
function on the PIIX chipset.
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Memory Interfaces Overview
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4.2.2.4
Peripheral Component Interface (PCI)
The PCI module allows communication with devices complaint to the PCI Local Bus Specification (revision
2.3) via a 32-bit address/data bus operating at speeds up to 33 MHz.
The PCI module supports the following features:
• PCI Local Bus Specification (revision 2.3) compliant
• Single function PCI interface provided
• 32-bit address/data bus width
• Operation up to 33 MHz and up to 66 MHz (for DM6467T devices only)
• Optimized burst behavior supported for system cache line sizes of 16, 32, 64 and 128 bytes
• PCI is only accessible from the ARM
4.2.2.5
Host Port Interface (HPI)
The HPI provides a parallel port interface through which an external host processor can directly access
the TMS320DM646x DMSoC processor's resources (configuration and program/data memories). The
external host device is asynchronous to the CPU clock and functions as a master to the HPI interface. The
HPI enables a host device and the DM646x DMSoC processor to exchange information via internal or
external memory. Dedicated address (HPIA) and data (HPID) registers within the HPI provide the data
path between the external host interface and the processor resources. An HPI control register (HPIC) is
available to the host and the CPU for various configuration and interrupt functions.
The HPI supports the following features:
• Multiplexed address/data
• Dual 16-bit halfword cycle access (internal data word is 32-bits wide)
• 16-bit-wide host data bus interface
• Internal data bursting using 8-word read and write first-in, first-out (FIFO) buffers
• HPI control register (HPIC) accessible by both the ARM CPU and the external host
• HPI address register (HPIA) accessible by both the ARM CPU and the external host
• Separate HPI address registers for read (HPIAR) and write (HPIAW) with configurable option for
operating as a single HPI address register
• HPI data register (HPID)/FIFOs providing data-path between external host interface and CPU
resources
• Multiple strobes and control signals to allow flexible host connection
• Asynchronous HRDY output to allow the HPI to insert wait states to the host
• Software control of data prefetching to the HPID/FIFOs
• Processor-to-Host interrupt output signal controlled by HPIC accesses
• Host-to-Processor interrupt controlled by HPIC accesses
• Register controlled HPIA and HPIC ownership and FIFO timeout
• Memory-mapped peripheral identification register (PID)
• Bus holders on host data and address buses (these are actually external to HPI module)
• 32-bit word cycle access (internal data word is 32-bits wide)
• 32-bit-wide host data bus interface
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System Memory
Copyright © 2010, Texas Instruments Incorporated
33
34
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Copyright © 2010, Texas Instruments Incorporated
Chapter 5
SPRUEP9E – August 2010
PLL Controller
Topic
5.1
5.2
5.3
5.4
...........................................................................................................................
PLL Module ......................................................................................................
PLL1 Control ....................................................................................................
PLL2 Control ....................................................................................................
PLL Controller Registers ....................................................................................
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PLL Controller
Copyright © 2010, Texas Instruments Incorporated
Page
36
38
41
45
35
PLL Module
5.1
www.ti.com
PLL Module
The TMS320DM646x DMSoC has two PLL controllers that provide clocks to different parts of the system
(see Figure 5-1). PLL1 provides clocks (though various dividers) to most of the components of the
DMSoC. PLL2 is dedicated to the DDR2 memory controller. See the device-specific data manual for the
supported input clocks.
The PLL controller provides the following:
• Glitch-Free Transitions (on changing clock settings)
• Domain Clocks Alignment
• Clock Gating
• PLL power down
The various clock outputs given by the controller are:
• Domain Clocks: SYSCLK [1:n]
• Auxiliary Clock from reference clock source: AUXCLK
• Bypass Domain clock: SYSCLKBP
Various dividers that can be used are:
• SYSCLK Divider: D1, …, Dn
• SYSCLKBP Divider: BPDIV
Various other controls supported are:
• PLL Multiplier Control: PLLM
• Software programmable PLL Bypass: PLLEN
36
PLL Controller
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Copyright © 2010, Texas Instruments Incorporated
PLL Module
www.ti.com
Figure 5-1. PLL1 and PLL2 Clock Domain Block Diagram
PLL Controller 1
DEV_MXI/
DEV_CLKIN
PLLM
PLLDIV1 (/1 Fixed)
PLLDIV2 (/2 Fixed)
PLLDIV3 (/4 Fixed)
PLLDIV4 (/6 Prog)
PLLDIV9 (/6 Prog)
PLLDIV5 (/8 Prog)
PLLDIV6 (/8 Prog)
PLLDIV8 (/8 Prog)
BPDIV (/1 Prog)
SYSCLK1
DSP Subsystem
SYSCLK2
PCI
GPIO
VDCE
Timer 0
HDVICP0
Timer 1
HDVICP1
Timer 2 (WD)
EDMA3
I2C
Crossbar/SCR
PWM (x2)
ARM Subsystem
SYSCLK3
HPI
EMAC/MDIO
SYSCLK4
ATA
SYSCLK9
EMIFA
VLYNQ
SYSCLK5
TSIF0
SYSCLK6
SPI
ARM INTC
SYSCLK8
TSIF1
SYSCLKBP
AUXCLK
Video Port
I/F
VP_CLKIN0
VP_CLKIN1
VP_CLKIN2
VP_CLKIN3
STC_CLKIN
TINP0L
TINP0U
TINP1L
USB 2.0
60 MHz
USB PHY
UART0
AUX_MXI/
AUX_CLKIN
(24/48 MHz)
UART1
Clock Select
Logic
UART2
McASP0
McASP1
CLKOUT0
AUDIO_CLK0
AUDIO_CLK1
CRG0_VCXI
CRGEN0
CRG1_VCXI
CRGEN1
PLL Controller 2
PLLM
PLLDIV1 (/1 Prog)
PLL2_SYSCLK1
DDR2 Mem Cltr
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PLL Controller
Copyright © 2010, Texas Instruments Incorporated
37
PLL1 Control
5.2
www.ti.com
PLL1 Control
PLL1 supplies the primary DM646x DMSoC system clock. Software controls the PLL1 operation through
the system PLL controller 1 (PLLC1) registers (base address: 1C4 0800h). Figure 5-2 shows the
customization of PLL1 in the DM646x DMSoC.
• The SYSCLK dividers are programmable (see Table 5-1).
• AUXCLK is the clock provided to the fixed clock domains.
The PLL1 multiplier is controlled by the PLLM bit in the PLL multiplier control register (PLLM) and is set to
a default value of 15h at power-up, resulting in a PLL multiplier of 22×. This default setting yields a
594-MHz PLL output clock when using a 27-MHz clock source. The PLL1 multiplier may be modified by
software (for example, set to 27× for a 729-MHz operation with a 27-MHz input clock source).
At power-up, PLL1 is powered-down/disabled and must be powered-up by software through the
PLLPWRDN bit in the PLL control register (PLLCTL). The system operates in bypass mode and the
system clock is provided directly from the input reference clock (CLKIN or OSCIN). Once the PLL is
powered-up and locked, software can switch the device to PLL mode operation. Set the PLLEN bit in
PLLCTL to enable the PLL.
Registers used in PLLC1 are listed in Table 5-4.
Figure 5-2. PLL1 Structure in the TMS320DM646x DMSoC
CLKMODE
CLKIN
1
OSCIN
0
PLLOUT
PLLEN
1
PLL
0
PLLM
PLLDIV1 (/1 Fixed)
SYSCLK1
PLLDIV2 (/2 Fixed)
SYSCLK2
PLLDIV3 (/4 Fixed)
SYSCLK3
PLLDIV4 (/6 Prog)
SYSCLK4
PLLDIV5 (/8 Prog)
SYSCLK5
PLLDIV6 (/8 Prog)
SYSCLK6
PLLDIV8 (/8 Prog)
SYSCLK8
PLLDIV9 (/6 Prog)
SYSCLK9
BPDIV (/1 Prog)
SYSCLKBP
AUXCLK
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PLL Controller
SPRUEP9E – August 2010
Copyright © 2010, Texas Instruments Incorporated
PLL1 Control
www.ti.com
5.2.1 Device Clock Generation
PLLC1 generates several clocks from the PLL1 output clock for use by the various processors and
modules. These are summarized in Table 5-1.
NOTE: The DM646x DMSoC supports multiple speed grade devices. Program SYSCLKn with the
appropriate divider values depending on the speed of the device. See the device-specific
data manual for different speed devices and corresponding SYSCLKn divider values.
Table 5-1. PLLC1 Output Clocks
Output Clock
Default Divider
Divider Type
Used by
SYSCLK1
/1
Fixed
DSP Subsystem
SYSCLK2
/2
Fixed
ARM Subsystem, EDMA, HDVICPs, DDR2 Memory
Controller, PCI, VPIFs, TSIFs, VDCE
SYSCLK3
/4
Fixed
HPI, EMIFA, USB, VLYNQ, UARTs, McASPs, I2C, SPIs,
PWMs, Timers, GPIO, EMAC, CRGEN, System Module
SYSCLK4
/6
Programmable
ATA
SYSCLK5
/8
Programmable
TSIF1
SYSCLK6
/8
Programmable
TSIF2
SYSCLK8
/8
Programmable
VPIF2
SYSCLK9
/6
Programmable
VLYNQ
DEV_CLKIN/n
Programmable
TSIFs
Fixed at DEV_CLKIN
TSIFs, VPIFs
SYSCLKBP
AUXCLK
DEV_CLKIN
5.2.2 Steps for Changing PLL1/Core Domain Frequency
Refer to the appropriate subsection on how to program the PLL1/Core Domain clocks:
• If the PLL is powered down (PLLPWRDN bit in PLLCTL is set to 1), follow the full PLL initialization
procedure in Section 5.2.2.1 to initialize the PLL.
• If the PLL is not powered down (PLLPWRDN bit in PLLCTL is cleared to 0), follow the sequence in
Section 5.2.2.2 to change the PLL multiplier.
• If the PLL is already running at a desired multiplier and only the SYSCLK dividers need to be changed,
follow the sequence in Section 5.3.2.4.
Note that the PLL is powered down after the following device-level global resets:
• Power-on Reset (POR)
• Warm Reset (RESET)
• Max Reset
SPRUEP9E – August 2010
PLL Controller
Copyright © 2010, Texas Instruments Incorporated
39
PLL1 Control
5.2.2.1
www.ti.com
Initialization to PLL Mode from PLL Power Down
If the PLL is powered down (PLLPWRDN bit in PLLCTL is set to 1), follow this procedure to change the
PLL1 frequencies. The recommendation is to stop all peripheral operation before changing the PLL1
frequency, with the exception of the ARM and DDR2 memory controller. The ARM must be operational to
program the PLL controller. The DDR2 memory controller operates off of the clock from PLLC2.
1. Select the clock mode by programming the CLKMODE bit in PLLCTL.
2. Before changing the PLL frequency, switch to PLL bypass mode:
(a) Clear the PLLENSRC bit in PLLCTL to 0 to allow PLLCTL.PLLEN to take effect.
(b) Clear the PLLEN bit in PLLCTL to 0 (select PLL bypass mode).
(c) Wait for 20 MXI clock cycles to ensure PLLC switches to bypass mode properly.
3. Set the PLLRST bit in PLLCTL to 1 (reset PLL).
4. Set the PLLDIS bit in PLLCTL to 1 (disable PLL output).
5. Clear the PLLPWRDN bit in PLLCTL to 0 to bring the PLL out of power-down mode.
6. Clear the PLLDIS bit in PLLCTL to 0 (enable the PLL) to allow PLL outputs to start toggling. Note that
the PLLC is still at PLL bypass mode; therefore, the toggling PLL output does not get propagated to
the rest of the device.
7. Wait for PLL stabilization time. (4096 MXI clock cycles)
8. Program the required multiplier value in the PLL multiplier control register (PLLM).
9. Wait for PLL to reset properly. The PLL reset time is a minimum of 32 MXI clock cycles.
10. Clear the PLLRST bit in PLLCTL to 0 to bring the PLL out of reset.
11. Wait for 2000 MXI clock or reference clock cycles to allow PLL to lock.
12. Set the PLLEN bit in PLLCTL to 1 to remove the PLL from bypass mode.
5.2.2.2
Changing PLL Multiplier
If the PLL is not powered down (PLLPWRDN bit in PLLCTL is cleared to 0) and the PLL stabilization time
is previously met (step 7 in Section 5.2.2.1), follow this procedure to change PLL1 multiplier. The
recommendation is to stop all peripheral operation before changing the PLL multiplier, with the exception
of the ARM and DDR2 memory controller. The ARM must be operational to program the PLL controller.
The DDR2 memory controller operates off of the clock from PLLC2.
1. Before changing the PLL frequency, switch to PLL bypass mode:
(a) Clear the PLLENSRC bit in PLLCTL to 0 to allow PLLCTL.PLLEN to take effect.
(b) Clear the PLLEN bit in PLLCTL to 0 (select PLL bypass mode).
(c) Wait for 20 MXI clock cycles to ensure PLLC switches to bypass mode properly.
2. Set the PLLRST bit in PLLCTL to 1 (reset PLL).
3. Clear the PLLDIS bit in PLLCTL to 0 (enable the PLL) to allow PLL outputs to start toggling. Note that
the PLLC is still at PLL bypass mode; therefore, the toggling PLL output does not get propagated to
the rest of the device.
4. Program the required multiplier value in the PLL multiplier control register (PLLM).
5. Wait for PLL to reset properly. The PLL reset time is a minimum of 32 MXI clock cycles.
6. Clear the PLLRST bit in PLLCTL to 0 to bring the PLL out of reset.
7. Wait for 2000 MXI clock or reference clock cycles to allow PLL to lock.
8. Set the PLLEN bit in PLLCTL to 1 to remove the PLL from bypass mode.
5.2.2.3
Changing SYSCLK Dividers
This section discusses the software sequence to change the SYSCLK dividers. The SYSCLK divider
change sequence is also referred to as GO operation, as it involves hitting the GO bit (GOSET bit in
PLLCMD) to initiate the divider change.
1. Check for the GOSTAT bit in the PLL controller status register (PLLSTAT) to clear to 0 to indicate that
no GO operation is currently in progress.
2. Program the RATIO field in the PLL controller divider n register (PLLDIV4-PLLDIV6, PLLDIV8,
PLLDIV9) with the desired divide factor.
3. Set the GOSET bit in PLLCMD to 1 to initiate a new divider transition.
40
PLL Controller
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Copyright © 2010, Texas Instruments Incorporated
PLL2 Control
www.ti.com
4. Wait for the GOSTAT bit in PLLSTAT to clear to 0 (completion of divider change).
NOTE: The DM646x DMSoC supports multiple speed grade devices. Program SYSCLKn with the
appropriate divider values depending on the speed of the device. See the device-specific
data manual for different speed devices and corresponding SYSCLKn divider values.
5.3
PLL2 Control
PLL2 provides the clock from which the DDR2 memory controller clock is derived. This is a separate clock
system from the PLL1 clocks provided to other components of the system. This dedicated clock allows the
reduction of the core clock rates to save power while maintaining the required minimum clock rate for
DDR2. PLL2 must be configured to output a 2x clock to the DDR2 PHY interface.
The DDR2 PLL controller (PLLC2) controls PLL2, which accepts the clock from the oscillator and
generates the various frequency clocks needed for the DDR2 memory controller. Figure 5-3 shows the
customization of PLL2 in the DM646x DMSoC.
• The SYSCLK divider is programmable.
• AUXCLK and SYSCLKBP are not used.
PLL2 supplies the DDR2 memory controller clock. Software controls PLL2 operation through the PLLC2
registers. The PLLM bits in the PLL multiplier control register (PLLM) control the PLL2 multiplier. The
PLL2 multiplier may be modified by software (for example, to tune the DDR2 memory controller interface
for best performance).
The PLL2 output clock must be divided-down to the DDR2 memory controller operating range.
At power-up, PLL2 is powered-down and must be powered-up by software through the PLLPWRDN bit in
the PLL control register (PLLCTL). The PLLC2 is in bypass mode and the DDR2 memory controller clock
is provided directly from the input reference clock. Once the PLL is powered-up and locked, software may
switch the device to PLL mode operation by setting the PLLEN bit in PLLCTL.
Registers used in PLLC2 are listed in Table 5-4.
NOTE: PLLDIV1 defaults to /1 at reset and can be modified after reset. PLLDIV2 through PLLDIV9
are not supported on PLL2.
Figure 5-3. PLL2 Structure in TMS320DM646x DMSoC
PLLOUT
CLKIN/OSCIN
(A)
PLL
PLLEN
1
PLLDIV1 (/1 Prog)
0
PLL2_SYSCLK1
(DDR2_PHY)
PLLM
(A) As selected by the PLL2 PLLCTL register
SPRUEP9E – August 2010
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Copyright © 2010, Texas Instruments Incorporated
41
PLL2 Control
www.ti.com
5.3.1 Device Clock Generation
PLLC2 generates the clock from the PLL2 output clock for use by the DDR2 memory controller, as shown
in Table 5-2.
The SYSCLK1 output clock divider value defaults to /1. It can be modified by software (using the RATIO
bit in PLLDIV1) in combination with other PLL multipliers to achieve the desired DDR2 memory controller
clock rate.
Table 5-2. PLLC2 Output Clock
Output Clock
SYSCLK1
Default Divider
Divider Type
Used by
/1
Programmable
DSP Subsystem
5.3.2 Steps for Changing PLL2 Frequency
The PLLC2 is programmed similarly to the PLLC1. Refer to the appropriate subsection on how to program
the PLL2 clocks:
• If the PLL is powered down (PLLPWRDN bit in PLLCTL is set to 1), follow the full PLL initialization
procedure in Section 5.3.2.2 to initialize the PLL.
• If the PLL is not powered down (PLLPWRDN bit in PLLCTL is cleared to 0), follow the sequence in
Section 5.3.2.3 to change the PLL multiplier.
• If the PLL is already running at a desired multiplier and only the SYSCLK divider needs to be changed,
follow the sequence in Section 5.3.2.4.
Note that the PLL is powered down after the following device-level global resets:
• Power-on Reset (POR)
• Warm Reset (RESET)
• Max Reset
In addition, note that the PLL2 frequency directly affects the DDR2 memory controller. The DDR2 memory
controller requires a special sequence to be followed before and after changing the PLL2 frequency.
Follow the additional considerations for the DDR2 memory controller in Section 5.3.2.1, in order to not
corrupt DDR2 memory controller operation.
5.3.2.1
DDR2 Memory Controller Considerations When Modifying PLL2 Frequency
Before changing PLL2 and/or PLLC2 frequency, take the DDR2 memory controller requirements into
account. If the DDR2 memory controller is used in the system, follow the additional steps in this section to
change PLL2 and/or PLLC2 frequency without corrupting DDR2 memory controller operation.
• If the DDR2 memory controller is in reset when you desire to change the PLL2 frequency, follow the
steps in Section 5.3.2.1.1.
• If the DDR2 memory controller is already out of reset when you desire to change the PLL2 frequency,
follow the steps in Section 5.3.2.1.2.
5.3.2.1.1 PLL2 Frequency Change Steps When DDR2 Memory Controller is In Reset
This section discusses the steps to change the PLL2 frequency when the DDR2 memory controller is in
reset. Note that the DDR2 memory controller is in reset after these device-level global resets: power-on
reset (POR), warm reset (RESET), and max reset.
1. Leave the DDR2 memory controller in reset.
2. Program the PLL2 clocks by following the steps in the appropriate section: Section 5.3.2.2,
Section 5.3.2.3, or Section 5.3.2.4. (Discussion in Section 5.3.2 explains which is the appropriate
subsection).
3. Initialize the DDR2 memory controller. The steps for DDR2 memory controller initialization are found in
the TMS320DM646x DMSoC DDR2 Memory Controller User's Guide (SPRUEQ4).
42
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5.3.2.1.2 PLL2 Frequency Change Steps When DDR2 Memory Controller is Out of Reset
This section discusses the steps to change the PLL2 frequency when the DDR2 memory controller is
already out of reset.
1. Stop DDR2 memory controller accesses and purge any outstanding requests.
2. Put the DDR2 memory in self-refresh mode and stop the DDR2 memory controller clock. The DDR2
memory controller clock shut down sequence is in the TMS320DM646x DMSoC DDR2 Memory
Controller User's Guide (SPRUEQ4).
3. Program the PLL2 clocks by following the steps in the appropriate section: Section 5.3.2.2,
Section 5.3.2.3, or Section 5.3.2.4. (Discussion in Section 5.3.2 explains which is the appropriate
subsection).
4. Re-enable the DDR2 memory controller clock. The DDR2 memory controller clock on sequence is in
the TMS320DM646x DMSoC DDR2 Memory Controller User's Guide (SPRUEQ4).
5.3.2.2
Initialization to PLL Mode from PLL Power Down
If the PLL is powered down (PLLPWRDN bit in PLLCTL is set to 1), follow this procedure to change PLL2
frequencies.
1. Select the clock mode by programming the CLKMODE bit in PLLCTL.
2. Before changing the PLL frequency, switch to PLL bypass mode:
(a) Clear the PLLENSRC bit in PLLCTL to 0 to allow PLLCTL.PLLEN to take effect.
(b) Clear the PLLEN bit in PLLCTL to 0 (select PLL bypass mode).
(c) Wait for 20 MXI clock cycles to ensure PLLC switches to bypass mode properly.
3. Set the PLLRST bit in PLLCTL to 1 (reset PLL)
4. Set the PLLDIS bit in PLLCTL to 1 (disable PLL output).
5. Clear the PLLPWRDN bit in PLLCTL to 0 to bring the PLL out of power-down mode.
6. Clear the PLLDIS bit in PLLCTL to 0 (enable the PLL) to allow PLL outputs to start toggling. Note that
the PLLC is still at PLL bypass mode; therefore, the toggling PLL output does not get propagated to
the rest of the device.
7. Wait for PLL stabilization time. (4096 MXI clock cycles)
8. Program the required multiplier value in the PLL multiplier control register (PLLM).
9. If necessary, program the PLL controller divider 1 register (PLLDIV1) to change the SYSCLK1 divide
value:
(a) Program the RATIO field in PLLDIV1 with the desired divide factor.
(b) Set the GOSET bit in PLLCMD to 1 to initiate a new divider transition.
(c) Wait for the GOSTAT bit in the PLL controller status register (PLLSTAT) to clear to 0 (completion of
phase alignment).
10. Wait for PLL to reset properly. The PLL reset time is a minimum of 32 MXI clock cycles.
11. Clear the PLLRST bit in PLLCTL to 0 to bring the PLL out of reset.
12. Wait for 2000 MXI clock or reference clock cycles to allow PLL to lock.
13. Set the PLLEN bit in PLLCTL to 1 to remove the PLL from bypass mode.
For information on initializing the DDR2 memory controller, see the TMS320DM646x DMSoC DDR2
Memory Controller User's Guide (SPRUEQ4).
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Changing PLL Multiplier
If the PLL is not powered down (PLLPWRDN bit in PLLCTL is cleared to 0) and the PLL stabilization time
is previously met (step 7 in Section 5.3.2.2), follow this procedure to change PLL2 multiplier.
1. Before changing the PLL frequency, switch to PLL bypass mode:
(a) Clear the PLLENSRC bit in PLLCTL to 0 to allow PLLCTL.PLLEN to take effect.
(b) Clear the PLLEN bit in PLLCTL to 0 (select PLL bypass mode).
(c) Wait for 20 MXI clock cycles to ensure PLLC switches to bypass mode properly.
2. Set the PLLRST bit in PLLCTL to 1 (reset PLL).
3. Clear the PLLDIS bit in PLLCTL to 0 (enable the PLL) to allow PLL outputs to start toggling. Note that
the PLLC is still at PLL bypass mode; therefore, the toggling PLL output does not get propagated to
the rest of the device.
4. Program the required multiplier value in the PLL multiplier control register (PLLM).
5. If necessary, program the PLL controller divider 1 register (PLLDIV1) to change the SYSCLK1 divide
value:
(a) Program the RATIO field in PLLDIV1 with the desired divide factor.
(b) Set the GOSET bit in PLLCMD to 1 to initiate a new divider transition.
(c) Wait for the GOSTAT bit in the PLL controller status register (PLLSTAT) to clear to 0 (completion of
phase alignment).
6. Wait for PLL to reset properly. The PLL reset time is a minimum of 32 MXI clock cycles.
7. Clear the PLLRST bit in PLLCTL to 0 to bring the PLL out of reset.
8. Wait for 2000 MXI clock or reference clock cycles to allow PLL to lock.
9. Set the PLLEN bit in PLLCTL to 1 to remove the PLL from bypass mode.
5.3.2.4
Changing SYSCLK Dividers
This section discusses the software sequence to change the SYSCLK dividers. The SYSCLK divider
change sequence is also referred to as GO operation, as it involves hitting the GO bit (GOSET bit in
PLLCMD) to initiate the divider change.
1. Check for the GOSTAT bit in the PLL controller status register (PLLSTAT) to clear to 0 to indicate that
no GO operation is currently in progress.
2. Program the RATIO field in the PLL controller divider 1 register (PLLDIV1) with the desired divide
factor.
3. Set the GOSET bit in PLLCMD to 1 to initiate a new divider transition.
4. Wait for the GOSTAT bit in PLLSTAT to clear to 0 (completion of divider change).
NOTE: The DM646x DMSoC supports multiple speed grade devices. Program SYSCLKn with the
appropriate divider values depending on the speed of the device. See the device-specific
data manual for different speed devices and corresponding SYSCLKn divider values.
44
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5.4
PLL Controller Registers
Table 5-3. PLL and Reset Controller Module Instance Table
Instance ID
Base Address
End Address
Size
0
1C4 0800h
1C4 0BFFh
400h
1
1C4 0C00h
1C4 0FFFh
400h
Table 5-4 lists the memory-mapped registers for the PLL and Reset Controller. See the device-specific
data manual for the memory address of these registers.
Table 5-4. PLL and Reset Controller Registers
Offset
(1)
Acronym
Register Description
Section
00h
PID
Peripheral ID Register
Section 5.4.1
E4h
RSTYPE
Reset Type Status Register
Section 5.4.2
100h
PLLCTL
PLL Control Register
Section 5.4.3
110h
PLLM
PLL Multiplier Control Register
Section 5.4.4
118h
PLLDIV1
PLL Controller Divider 1 Register
Section 5.4.5
11Ch
PLLDIV2 (1)
PLL Controller Divider 2 Register
Section 5.4.6
120h
PLLDIV3 (1)
PLL Controller Divider 3 Register
Section 5.4.7
Bypass Divider Register
Section 5.4.8
(1)
12Ch
BPDIV
138h
PLLCMD
PLL Controller Command Register
Section 5.4.9
13Ch
PLLSTAT
PLL Controller Status Register
Section 5.4.10
140h
ALNCTL
PLL Controller Clock Align Control Register
Section 5.4.11
144h
DCHANGE
PLLDIV Ratio Change Status Register
Section 5.4.12
148h
CKEN
Clock Enable Control Register
Section 5.4.13
14Ch
CKSTAT
Clock Status Register
Section 5.4.14
150h
SYSTAT
SYSCLK Status Register
Section 5.4.15
160h
PLLDIV4 (1)
PLL Controller Divider 4 Register
Section 5.4.16
164h
PLLDIV5 (1)
PLL Controller Divider 5 Register
Section 5.4.16
168h
PLLDIV6
(1)
PLL Controller Divider 6 Register
Section 5.4.16
170h
PLLDIV8 (1)
PLL Controller Divider 8 Register
Section 5.4.16
174h
PLLDIV9 (1)
PLL Controller Divider 9 Register
Section 5.4.16
For PLL1 only, not supported for PLL2
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5.4.1 Peripheral ID Register (PID)
The peripheral ID register (PID) is shown in Figure 5-4 and described in Table 5-5.
Figure 5-4. Peripheral ID Register (PID)
31
24
23
16
Reserved
TYPE
R-0
R-1h
15
8
7
0
CLASS
REV
R-8h
R-2h
LEGEND: R = Read only; -n = value after reset
Table 5-5. Peripheral ID Register (PID) Field Descriptions
Bit
Field
31-24
Reserved
23-16
TYPE
15-8
CLASS
Value
0
Reserved
Peripheral type
1h
PLLC
Peripheral class
8h
7-0
Description
REV
Current class
Peripheral revision
2h
Current revision
5.4.2 Reset Type Status Register (RSTYPE)
The reset type status register (RSTYPE) is shown in Figure 5-5 and described in Table 5-6. Latches
cause of the last reset. Although the reset value of all bits is 0 after coming out of reset, one bit is set to 1
to indicate the cause of the reset.
Figure 5-5. Reset Type Status Register (RSTYPE)
31
16
Reserved
R-0
15
3
2
1
0
Reserved
4
SRST
MRST
XWRST
POR
R-0
R-0
R-0
R-0
R-0
LEGEND: R = Read only; -n = value after reset
Table 5-6. Reset Type Status Register (RSTYPE) Field Descriptions
Bit
31-4
46
Field
Reserved
Value
0
Description
Reserved
3
SRST
0-1
System reset. If 1, the system reset was the last reset to occur that is of highest priority.
2
MRST
0-1
Maximum reset. If 1, the maximum reset was the reset to occur that is of highest priority.
1
XWRST
0-1
External warm reset. If 1, the external warm reset (RESET) was the last reset to occur that is of highest
priority.
0
POR
0-1
Power-on reset. If 1, the power-on reset (POR) was the last reset to occur that is of highest priority.
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5.4.3 PLL Control Register (PLLCTL)
The PLL control register (PLLCTL) is shown in Figure 5-6 and described in Table 5-7.
Figure 5-6. PLL Control Register (PLLCTL)
31
16
Reserved
R-0
15
5
4
3
2
1
0
Reserved
9
CLKMODE
8
Reserved
7
6
PLLENSRC
PLLDIS
PLLRST
Rsvd
PLLPWRDN
PLLEN
R-0
R/W-0
R-3h
R/W-1
R/W-1
R/W-0
R-0
R/W-1
R/W-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 5-7. PLL Control Register (PLLCTL) Field Descriptions
Bit
31-9
8
Field
Reserved
Value
0
CLKMODE
Description
Reserved
Reference Clock Selection
0
Internal oscillator
1
CLKIN square wave
Reserved
1
Reserved
5
PLLENSRC
0
This bit must be cleared before PLLEN will have any effect.
4
PLLDIS
7-6
3
PLL disable is de-asserted.
1
PLL disable is asserted.
PLLRST
2
Reserved
1
PLLPWRDN
0
Asserts DISABLE to PLL if supported.
0
Asserts RESET to PLL if supported.
0
PLL reset is asserted.
1
PLL reset is not asserted.
0
Reserved
PLL power-down.
0
PLL operation
1
PLL power-down
PLLEN
PLL mode enable.
0
Bypass mode
1
PLL mode, not bypassed
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5.4.4 PLL Multiplier Control Register (PLLM)
The PLL multiplier control register (PLLM) is shown in Figure 5-7 and described in Table 5-8.
Figure 5-7. PLL Multiplier Control Register (PLLM)
31
16
Reserved
R-0
15
5
4
0
Reserved
PLLM
R-0
R/W-15h
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 5-8. PLL Multiplier Control Register (PLLM) Field Descriptions
Bit
Field
31-5
Reserved
4-0
PLLM
Value
0
D-1Fh
Description
Reserved
PLL Multiplier select. Multiplier Value = PLLM + 1. The valid range of multiplier values for a given
MXI/CLKIN is defined by the minimum and maximum frequency limits on the PLL VCO frequency. See
the device-specific data manual for PLL VCO frequency specification limits.
5.4.5 PLL Controller Divider 1 Register (PLLDIV1)
The PLL controller divider 1 register (PLLDIV1) is shown in Figure 5-8 and described in Table 5-9.
Divider 1 controls the divider for SYSCLK1.
NOTE: For PLL1, the SYSCLK1 divider value is fixed and is not programmable; for PLL2, the
SYSCLK1 divider value is programmable.
Figure 5-8. PLL Controller Divider 1 Register (PLLDIV1)
31
16
Reserved
R-0
15
14
4
3
0
D1EN
Reserved
RATIO
R/W-0
R-0
R/W-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 5-9. PLL Controller Divider 1 Register (PLLDIV1) Field Descriptions
Bit
31-16
15
48
Field
Reserved
Value
0
D1EN
14-4
Reserved
3-0
RATIO
Description
Reserved
Divider enable for SYSCLK1.
0
Disable
1
Enable
0
Reserved
0-Fh
Divider ratio. Divider Value = RATIO + 1. RATIO defaults to 0 (PLL divide by 1).
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5.4.6 PLL Controller Divider 2 Register (PLLDIV2)
The PLL controller divider 2 register (PLLDIV2) is shown in Figure 5-9 and described in Table 5-10.
Divider 2 controls the divider for SYSCLK2. PLLDIV2 is not supported for PLL2.
NOTE: The SYSCLK2 divider value is fixed and is not programmable.
Figure 5-9. PLL Controller Divider 2 Register (PLLDIV2)
31
16
Reserved
R-0
15
14
4
3
0
D2EN
Reserved
RATIO
R/W-1
R-0
R/W-1
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 5-10. PLL Controller Divider 2 Register (PLLDIV2) Field Descriptions
Bit
31-16
15
Field
Reserved
Value
0
D2EN
14-4
Reserved
3-0
RATIO
Description
Reserved
Divider enable for SYSCLK2.
0
Disable
1
Enable
0
Reserved
0-Fh
Divider ratio. Divider Value = RATIO + 1. RATIO defaults to 1 (PLL1 divide by 2).
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5.4.7 PLL Controller Divider 3 Register (PLLDIV3)
The PLL controller divider 3 register (PLLDIV3) is shown in Figure 5-10 and described in Table 5-11.
Divider 3 controls the divider for SYSCLK3. PLLDIV3 is not supported for PLL2.
NOTE: The SYSCLK3 divider value is fixed and is not programmable.
Figure 5-10. PLL Controller Divider 3 Register (PLLDIV3)
31
16
Reserved
R-0
15
14
4
3
0
D3EN
Reserved
RATIO
R/W-1
R-0
R/W-3h
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 5-11. PLL Controller Divider 3 Register (PLLDIV3) Field Descriptions
Bit
31-16
15
50
Field
Reserved
Value
0
D3EN
14-4
Reserved
3-0
RATIO
Description
Reserved
Divider enable for SYSCLK3.
0
Disable
1
Enable
0
Reserved
0-Fh
Divider ratio. Divider Value = RATIO + 1. RATIO defaults to 3h (PLL divide by 4).
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5.4.8 Bypass Divider Register (BPDIV)
The bypass divider register (BPDIV) is shown in Figure 5-11 and described in Table 5-12. Bypass divider
controls the divider for SYSCLKBP. BPDIV is not supported for PLL2.
Figure 5-11. Bypass Divider Register (BPDIV)
31
16
Reserved
R-0
15
14
5
4
0
BPDEN
Reserved
RATIO
R/W-1
R-0
R/W-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 5-12. Bypass Divider Register (BPDIV) Field Descriptions
Bit
31-16
15
Field
Value
Reserved
0
BPDEN
14-5
Reserved
4-0
RATIO
Description
Reserved
Bypass divider enable.
0
Disable
1
Enable
0
Reserved
0-1Fh
Divider ratio. Divider Value = RATIO + 1. RATIO defaults to 0 (PLL divide by 1).
5.4.9 PLL Controller Command Register (PLLCMD)
The PLL controller command register (PLLCMD) is shown in Figure 5-12 and described in Table 5-13.
Contains command bits for various operations. Writes of 1 initiate command; writes of 0 clear the bit, but
have no effect.
Figure 5-12. PLL Controller Command Register (PLLCMD)
31
16
Reserved
R-0
15
1
0
Reserved
GOSET
R-0
R/W0C-0
LEGEND: R/W = Read/Write; R = Read only; W0C = Write 0 to clear bit; -n = value after reset
Table 5-13. PLL Controller Command Register (PLLCMD) Field Descriptions
Bit
31-1
0
Field
Reserved
Value
0
GOSET
Description
Reserved
GO bit for SYSCLKn phase alignment.
0
Clear bit (no effect)
1
Phase alignment
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5.4.10 PLL Controller Status Register (PLLSTAT)
The PLL controller status register (PLLSTAT) is shown in Figure 5-13 and described in Table 5-14.
Figure 5-13. PLL Controller Status Register (PLLSTAT)
31
16
Reserved
R-0
15
2
1
0
Reserved
3
STABLE
Reserved
GOSTAT
R-0
R-0
R-0
R-0
LEGEND: R = Read only; -n = value after reset
Table 5-14. PLL Controller Status Register (PLLSTAT) Field Descriptions
Bit
52
Field
31-3
Reserved
2
STABLE
1
Reserved
0
GOSTAT
Value
0
Description
Reserved
OSC counter done, oscillator assumed to be stable. By the time the device comes out of reset, this bit
should become 1.
0
No
1
Yes
0
Reserved
Status of GO operation. If 1, indicates GO operation is in progress.
0
GO operation is not in progress.
1
GO operation is in progress.
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5.4.11 PLL Controller Clock Align Control Register (ALNCTL)
The PLL controller clock align control register (ALNCTL) is shown in Figure 5-14 and described in
Table 5-15. Indicates which SYSCLKs need to be aligned for proper device operation.
Figure 5-14. PLL Controller Clock Align Control Register (ALNCTL)
31
16
Reserved
R-0
15
8
7
6
5
4
3
2
1
0
Reserved
9
ALN9 (1)
ALN8 (1)
Rsvd
ALN6 (1)
ALN5 (1)
ALN4 (1)
ALN3 (1)
ALN2 (1)
ALN1
R-0
R/W-1
R/W-1
R-0
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
(1)
For PLL1 only, not supported for PLL2.
Table 5-15. PLL Controller Clock Align Control Register (ALNCTL) Field Descriptions
Bit
31-9
8
7
Field
Reserved
5
ALN6
2
1
0
Description
Reserved
SYSCLK9 needs to be aligned to others selected in this register. For PLL1 only, not supported for
PLL2.
0
No
1
Yes
ALN8
Reserved
3
0
ALN9
6
4
Value
SYSCLK8 needs to be aligned to others selected in this register. For PLL1 only, not supported for
PLL2.
0
No
1
Yes
0
Reserved
SYSCLK6 needs to be aligned to others selected in this register. For PLL1 only, not supported for
PLL2.
0
No
1
Yes
ALN5
SYSCLK5 needs to be aligned to others selected in this register. For PLL1 only, not supported for
PLL2.
0
No
1
Yes
ALN4
SYSCLK4 needs to be aligned to others selected in this register. For PLL1 only, not supported for
PLL2.
0
No
1
Yes
ALN3
SYSCLK3 needs to be aligned to others selected in this register. For PLL1 only, not supported for
PLL2.
0
No
1
Yes
ALN2
SYSCLK2 needs to be aligned to others selected in this register. For PLL1 only, not supported for
PLL2.
0
No
1
Yes
ALN1
SYSCLK1 needs to be aligned to others selected in this register.
0
No
1
Yes
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5.4.12 PLLDIV Ratio Change Status Register (DCHANGE)
The PLLDIV ratio change status register (DCHANGE) is shown in Figure 5-15 and described in
Table 5-16. Indicates if SYSCLKn divide ratio has been modified.
NOTE: The DM646x DMSoC supports multiple speed grade devices. Program SYSCLKn with the
appropriate divider values depending on the speed of the device. See the device-specific
data manual for different speed devices and corresponding SYSCLKn divider values.
Figure 5-15. PLLDIV Ratio Change Status Register (DCHANGE)
31
16
Reserved
R-0
15
8
7
6
5
4
3
2
1
0
Reserved
9
SYS9 (1)
SYS8 (1)
Rsvd
SYS6 (1)
SYS5 (1)
SYS4 (1)
SYS3 (1)
SYS2 (1)
SYS1
R-0
R-0
R-0
R-0
R-0
R-0
R-0
R-0
R-0
R-0
LEGEND: R = Read only; -n = value after reset
(1)
For PLL1 only, not supported for PLL2.
Table 5-16. PLLDIV Ratio Change Status Register (DCHANGE) Field Descriptions
Bit
31-9
8
7
Reserved
0
Reserved
SYS6
Description
Reserved
SYSCLK9 divide ratio is modified. SYSCLK9 divide ratio is changed during GO operation. For PLL1
only, not supported for PLL2.
0
Ratio has not been modified. When the GOSET bit in the PLL controller command register (PLLCMD) is
set, SYSCLK9 is not affected.
1
Ratio has been modified. When the GOSET bit in the PLL controller command register (PLLCMD) is
set, SYSCLK9 changes to the new divide ratio.
SYS8
5
3
Value
SYS9
6
4
54
Field
SYSCLK8 divide ratio is modified. SYSCLK8 divide ratio is changed during GO operation. For PLL1
only, not supported for PLL2.
0
Ratio has not been modified. When the GOSET bit in the PLL controller command register (PLLCMD) is
set, SYSCLK8 is not affected.
1
Ratio has been modified. When the GOSET bit in the PLL controller command register (PLLCMD) is
set, SYSCLK8 changes to the new divide ratio.
0
Reserved
SYSCLK6 divide ratio is modified. SYSCLK6 divide ratio is changed during GO operation. For PLL1
only, not supported for PLL2.
0
Ratio has not been modified. When the GOSET bit in the PLL controller command register (PLLCMD) is
set, SYSCLK6 is not affected.
1
Ratio has been modified. When the GOSET bit in the PLL controller command register (PLLCMD) is
set, SYSCLK6 changes to the new divide ratio.
SYS5
SYSCLK5 divide ratio is modified. SYSCLK5 divide ratio is changed during GO operation. For PLL1
only, not supported for PLL2.
0
Ratio has not been modified. When the GOSET bit in the PLL controller command register (PLLCMD) is
set, SYSCLK5 is not affected.
1
Ratio has been modified. When the GOSET bit in the PLL controller command register (PLLCMD) is
set, SYSCLK5 changes to the new divide ratio.
SYS4
SYSCLK4 divide ratio is modified. SYSCLK4 divide ratio is changed during GO operation. For PLL1
only, not supported for PLL2.
0
Ratio has not been modified. When the GOSET bit in the PLL controller command register (PLLCMD) is
set, SYSCLK4 is not affected.
1
Ratio has been modified. When the GOSET bit in the PLL controller command register (PLLCMD) is
set, SYSCLK4 changes to the new divide ratio.
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Table 5-16. PLLDIV Ratio Change Status Register (DCHANGE) Field Descriptions (continued)
Bit
Field
2
SYS3
1
0
Value
Description
SYSCLK3 divide ratio is modified. SYSCLK3 divide ratio is changed during GO operation. For PLL1
only, not supported for PLL2.
0
Ratio has not been modified. When the GOSET bit in the PLL controller command register (PLLCMD) is
set, SYSCLK3 is not affected.
1
Ratio has been modified. When the GOSET bit in the PLL controller command register (PLLCMD) is
set, SYSCLK3 changes to the new divide ratio.
SYS2
SYSCLK2 divide ratio is modified. SYSCLK2 divide ratio is changed during GO operation. For PLL1
only, not supported for PLL2.
0
Ratio has not been modified. When the GOSET bit in the PLL controller command register (PLLCMD) is
set, SYSCLK2 is not affected.
1
Ratio has been modified. When the GOSET bit in the PLL controller command register (PLLCMD) is
set, SYSCLK2 changes to the new divide ratio.
SYS1
SYSCLK1 divide ratio is modified. SYSCLK1 divide ratio is changed during GO operation.
0
Ratio has not been modified. When the GOSET bit in the PLL controller command register (PLLCMD) is
set, SYSCLK1 is not affected.
1
Ratio has been modified. When the GOSET bit in the PLL controller command register (PLLCMD) is
set, SYSCLK1 changes to the new divide ratio.
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PLL Controller Registers
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5.4.13 Clock Enable Control Register (CKEN)
The clock enable control register (CKEN) is shown in Figure 5-16 and described in Table 5-17. Clock
enable control for miscellaneous output clocks. CKEN is not used on PLL2.
Figure 5-16. Clock Enable Control Register (CKEN)
31
16
Reserved
R-0
15
1
0
Reserved
AUXEN
R-0
R/W-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 5-17. Clock Enable Control Register (CKEN) Field Descriptions
Bit
31-1
0
Field
Reserved
Value
0
Description
Reserved
AUXEN
AUXCLK enable. The actual clock status is shown in the clock status register (CKSTAT).
0
Clock is disabled.
1
Clock is enabled.
5.4.14 Clock Status Register (CKSTAT)
The clock status register (CKSTAT) is shown in Figure 5-17 and described in Table 5-18. Clock status for
all clocks, except SYSCLKn. CKSTAT is not used on PLL2.
Figure 5-17. Clock Status Register (CKSTAT)
31
16
Reserved
R-0
15
4
3
2
1
0
Reserved
BPON
Reserved
AUXEN
R-0
R-1
R-0
R-0
LEGEND: R = Read only; -n = value after reset
Table 5-18. Clock Status Register (CKSTAT) Field Descriptions
Bit
31-4
3
2-1
0
56
Field
Reserved
Value
0
BPON
Reserved
Description
Reserved
SYSCLKBP on status.
0
Off
1
On
0
Reserved
AUXEN
AUXCLK on status.
0
Off
1
On
PLL Controller
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PLL Controller Registers
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5.4.15 SYSCLK Status Register (SYSTAT)
The SYSCLK status register (SYSTAT) is shown in Figure 5-18 and described in Table 5-19. Indicates
SYSCLKn status. Actual default is determined by the actual clock status, which depends on the DnEN bit
in the PLL controller divider n register (PLLDIVn).
Figure 5-18. SYSCLK Status Register (SYSTAT)
31
16
Reserved
R-0
15
8
7
6
5
4
3
2
1
0
Reserved
9
SYS9ON (1)
SYS8ON (1)
Rsvd
SYS6ON (1)
SYS5ON (1)
SYS4ON (1)
SYS3ON (1)
SYS2ON (1)
SYS1ON
R-0
R-0
R-0
R-0
R-0
R-0
R-0
R-0
R-0
R-0
LEGEND: R = Read only; -n = value after reset
(1)
For PLL1 only, not supported for PLL2.
Table 5-19. SYSCLK Status Register (SYSTAT) Field Descriptions
Bit
Field
31-9
Reserved
8
SYS9ON
7
Reserved
5
SYS6ON
3
2
1
0
0
Description
Reserved
SYSCLK9 on status. For PLL1 only, not supported for PLL2.
0
Off
1
On
SYS8ON
6
4
Value
SYSCLK8 on status. For PLL1 only, not supported for PLL2.
0
Off
1
On
0
Reserved
SYSCLK6 on status. For PLL1 only, not supported for PLL2.
0
Off
1
On
SYS5ON
SYSCLK5 on status. For PLL1 only, not supported for PLL2.
0
Off
1
On
SYS4ON
SYSCLK4 on status. For PLL1 only, not supported for PLL2.
0
Off
1
On
SYS3ON
SYSCLK3 on status. For PLL1 only, not supported for PLL2.
0
Off
1
On
SYS2ON
SYSCLK2 on status. For PLL1 only, not supported for PLL2.
0
Off
1
On
SYS1ON
SYSCLK1 on status.
0
Off
1
On
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PLL Controller Registers
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5.4.16 PLL Controller Divider n Registers (PLLDIV4-PLLDIV6, PLLDIV8, PLLDIV9)
The PLL controller divider n register (PLLDIVn) is shown in Figure 5-19 and described in Table 5-20.
PLLDIV4 controls the divider for SYSCLK4, PLLDIV5 controls the divider for SYSCLK5, PLLDIV6 controls
the divider for SYSCLK6, PLLDIV8 controls the divider for SYSCLK8, and PLLDIV9 controls the divider for
SYSCLK9. PLLDIV4-PLLDIV6, PLLDIV8, PLLDIV9 are not supported for PLL2.
NOTE: The DM646x DMSoC supports multiple speed grade devices. Program SYSCLKn with the
appropriate divider values depending on the speed of the device. See the device-specific
data manual for different speed devices and corresponding SYSCLKn divider values.
Figure 5-19. PLL Controller Divider n Register (PLLDIVn)
31
16
Reserved
R-0
15
14
4
3
0
DnEN
Reserved
RATIO
R/W-1
R-0
R/W-5h or 7h (1)
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
(1)
For PLLDIV4 and PLLDIV9, RATIO defaults to 5 (PLL divide by 6); for PLLDIV5, PLLDIV6, and PLLDIV8, RATIO defaults to 7 (PLL
divide by 8).
Table 5-20. PLL Controller Divider n Register (PLLDIVn) Field Descriptions
Bit
31-16
15
58
Field
Reserved
Value
0
DnEN
14-4
Reserved
3-0
RATIO
Description
Reserved
Divider enable for SYSCLKn.
0
Disable
1
Enable
0
Reserved
0-Fh
Divider ratio. Divider Value = RATIO + 1.
PLL Controller
SPRUEP9E – August 2010
Copyright © 2010, Texas Instruments Incorporated
Chapter 6
SPRUEP9E – August 2010
Power and Sleep Controller (PSC)
Topic
6.1
6.2
6.3
6.4
6.5
6.6
...........................................................................................................................
Introduction ......................................................................................................
Power Domain and Module Topology ..................................................................
Executing Module State Transitions ....................................................................
IcePick Emulation Support in the PSC .................................................................
PSC Interrupts ..................................................................................................
PSC Registers ...................................................................................................
SPRUEP9E – August 2010
Power and Sleep Controller (PSC)
Copyright © 2010, Texas Instruments Incorporated
Page
60
61
64
65
65
67
59
Introduction
6.1
www.ti.com
Introduction
In the TMS320DM646x DMSoC system, the Power and Sleep Controller (PSC) is responsible for
managing transitions of clock on/off and reset. A block diagram of the PSC is shown in Figure 6-1. Many
of the PSC operations are transparent to software, such as hard reset operations. However, the PSC
provides you with an interface to control several important clock and reset operations. The clock and reset
operations are described in this chapter.
The PSC includes the following features:
• Manages chip resets
• Provides a software interface to:
– Control module clock ON/OFF
– Control module resets
– Control DSP local reset (CPU reset)
• Supports IcePick emulation features: power, clock, and reset
Figure 6-1. TMS320DM646x DMSoC Power and Sleep Controller (PSC)
PLLC
clks
arm clock
ARM
arm module reset
arm power
Interrupt
AINTC
dsp clock
PSC
DSP
dsp module reset
dsp local reset
dsp power
Emulation
peripheral clock
RESET
MODx
peripheral module reset
VDD
60
Always on
domain
peripheral power
Power and Sleep Controller (PSC)
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Power Domain and Module Topology
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6.2
Power Domain and Module Topology
The DM646x DMSoC system includes only one power domain (Always On) and multiple separate
modules, as shown in Figure 6-2 and summarized in Table 6-1. The Always On power domain is always in
the ON state when the chip is powered-on. The Always On domain is powered by the CVDD pins of the
DM646x DMSoC (see the device-specific data manual). All of the DM646x DMSoC modules reside within
the Always On power domain. See the device-specific data manual for details on the clock domains.
Table 6-1 shows the state of each module after chip power-on/hard reset. The default state of the DSP
module is determined by the DSP boot source (DSPBOOT) pin. If the DSP is selected to self-boot at reset
via this signal, the DSP module is enabled by default. The ARM, Timer2, and System Module are always
enabled.
Figure 6-2. TMS320DM646x DMSoC Power Domain and Module Topology
sysclk1
domain
PLL1
sysclk1
domain
Power
sysclk2
domain
sysclk3
domain
sysclk4
domain
sysclk5
domain
Always on
power domain
PLL0
sysclk6
domain
24 MHZ osc
domain
sysclkbp
domain
sysclk9
domain
sysclk8
domain
SPRUEP9E – August 2010
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domain
Power and Sleep Controller (PSC)
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Power Domain and Module Topology
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Table 6-1. Module Configuration
Default State
LPSC
Number
Module Name
Module State
[STATE bit in MDSTATn Register]
Local Reset State
[LRST bit in MDSTATn Register]
0
ARM
Enable [3h]
-
1
DSP C64x+
If DSPBOOT = 0, then Enable [3h]
If DSPBOOT = 1, then Enable [3h]
Asserted [0]
Deasserted [1]
2
HDVICP0
SwRstDisable [0]
Asserted [0]
3
HDVICP1
SwRstDisable [0]
Asserted [0]
4
EDMA3CC
SwRstDisable [0]
-
5
EDMA3TC0
SwRstDisable [0]
-
6
EDMA3TC1
SwRstDisable [0]
-
7
EDMA3TC2
SwRstDisable [0]
-
8
EDMA3TC3
SwRstDisable [0]
-
9
USB2.0
SwRstDisable [0]
-
10
ATA
SwRstDisable [0]
-
11
VLYNQ
SwRstDisable [0]
-
12
HPI
SwRstDisable [0]
-
13
PCI
SwRstDisable [0]
-
14
EMAC/MDIO
SwRstDisable [0]
-
15
VDCE
SwRstDisable [0]
-
Video Port (1)
SwRstDisable [0]
-
18
TSIF0
SwRstDisable [0]
-
19
TSIF1
SwRstDisable [0]
-
20
DDR2 Memory Contoller
SwRstDisable [0]
-
21
EMIFA
If BTMODE[3:0] ≠ 0100 and DSPBOOT = 0,
then SwRstDisable [0]
If BTMODE[3:0] = 0100 or DSPBOOT = 1,
then Enable [3h]
-
22
McASP0
SwRstDisable [0]
-
23
McASP1
SwRstDisable [0]
-
24
CRGEN0
SwRstDisable [0]
-
25
CRGEN1
SwRstDisable [0]
-
26
UART0
SwRstDisable [0]
-
27
UART1
SwRstDisable [0]
-
28
UART2
SwRstDisable [0]
-
29
PWM0
SwRstDisable [0]
-
30
PWM1
SwRstDisable [0]
-
31
I2C
SwRstDisable [0]
-
32
SPI
SwRstDisable [0]
-
33
GPIO
SwRstDisable [0]
-
34
Timer0
SwRstDisable [0]
-
35
Timer1
SwRstDisable [0]
-
36-44
Reserved
Reserved
-
45
ARM INTC
Enable [3h]
-
16-17
(1)
62
The video port has a total of 5 clock inputs that can be controlled by LPSC. One LPSC can support a maximum of 4 clocks, so
two LPSCs are assigned for the video port. Both video port LPSCs should be set to the same state.
Power and Sleep Controller (PSC)
SPRUEP9E – August 2010
Copyright © 2010, Texas Instruments Incorporated
Power Domain and Module Topology
www.ti.com
6.2.1 Power Domain States
A power domain can only be in one of two states: ON or OFF, defined as:
• ON: power to the power domain is on.
• OFF: power to the power domain is off.
In the DM646x DMSoC, there is only one power domain (Always On) .The Always On power domain is
always in the ON state when the chip is powered-on.
6.2.2 Module States
A module can be in one of four states: Disable, Enable, SyncReset, or SwRstDisable, as defined by the
STATE bit in the module status n register (MDSTATn) in the PSC. These four states correspond to
combinations of module reset asserted or deasserted and module clock on or off, as shown in Table 6-2.
NOTE: Module Reset is defined to completely reset a given module, so that all hardware returns to
its default state. See Chapter 10 for more information on module reset.
For more information on the DM646x DMSoC power management, see Chapter 7.
Table 6-2. Module States
STATE Bit
in MDSTATn
Module State
Module Reset
Module Clock
Module State Definition
0
SwRstDisable
Asserted
Off
A module in the SwResetDisable state has its module reset
asserted and it has its clock set to off. After initial power-on,
most modules are in the SwRstDisable state by default (see
Table 6-1). Generally, software is not expected to initiate this
state.
1
SyncReset
Asserted
On
A module in the SyncReset state has its module reset
asserted and it has its clock on. Generally, software is not
expected to initiate this state.
2h
Disable
Deasserted
Off
A module in the Disable state has its module reset
deasserted and it has its clock off. This state is typically used
for disabling a module clock to save power. The DM646x
DMSoC is designed in full static CMOS, so when you stop a
module clock, it retains the module's state. When the clock is
restarted, the module resumes operating from the stopping
point.
3h
Enable
Deasserted
On
A module in the Enable state has its module reset
deasserted and it has its clock on. This is the normal
run-time state for a given module.
6.2.3 DSP Local Reset
In addition to module reset (as described in Section 6.2.2), the DSP CPU can be reset using a special
local reset. When DSP local reset is asserted, the DSP’s internal memories (L1P, L1D, and L2) are still
accessible. The local reset only resets the DSP CPU core, not the rest of the DSP subsystem, as would
the DSP module reset. Local reset is useful when the DSP module is in the Enable state or in the Disable
state; since module reset is asserted in the SyncReset and SwRstDisable states, and module reset takes
precedence over local reset. The ARM uses local reset to reset the DSP to initiate the DSP boot process.
See Chapter 10 and Chapter 12 for more information on local reset, as well as DSP boot.
SPRUEP9E – August 2010
Power and Sleep Controller (PSC)
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63
Executing Module State Transitions
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The procedures for asserting and deasserting DSP local reset are:
1. Clear the LRST bit in the module control 1 register (MDCTL1) in the PSC to 0. This asserts the DSP
local reset. By default, after power-on reset or hard reset, the DSP boot source (DSPBOOT) pin
determines the default state of the LRST bit in MDCTL1. See Chapter 10 for more information on this
boot configuration pin.
2. Set the LRST bit in MDCTL1 to 1. This deasserts the DSP local reset. After reset is deasserted, if the
DSP is in the Enable state, the DSP immediately begins code execution from the boot address
programmed in the DSP boot address register (DSPBOOTADDR) in the System Module.
6.3
Executing Module State Transitions
The procedure for module state transitions is as follows (n corresponds to the module number, see
Table 6-1 for the module numbers):
1. Wait for the GOSTAT[0] bit in the power domain transition status register (PTSTAT) to clear to 0. You
must wait for any previously initiated transitions to finish before initiating a new transition.
2. Set the NEXT bit in the module control n register (MDCTLn) to SwRstDisable (0), SyncReset (1),
Disable (2h), or Enable (3h).
NOTE: You may set transitions in multiple NEXT bits in multiple MDCTLn in this step. For the video
port, the NEXT bits should be set for both video port LPSCs (MDCTL16 and MDCTL17) in
this step.
3. This is a special step required for these specific modules. This step is not required for any module that
is not listed. Set the EMURSTIE bit in MDCTLn to 1, if the module you want to transition is any of the
following:
• EMAC
• USB
• ATA
• VLYNQ
• DDR2 memory controller
• Asynchronous EMIF
• McASP
• GPIO
NOTE: The EMURSTIE bit in MDCTLn is also used for PSC emulation features. The emulation
features are described in Section 6.4.
4. Set the GO[0] bit in the power domain transition command register (PTCMD) to 1 to initiate the
transition(s).
5. Wait for the GOSTAT[0] bit in PTSTAT to clear to 0. The module is safely in the new state only after
the GOSTAT[0] bit in PTSTAT is cleared to 0.
6. Wait for the STATE bit in the module status n register (MDSTATn) to change to the required state,
SwRstDisable (0), SyncReset (1), Disable (2h), or Enable (3h), that was set in MDCTLn.
NOTE: You need to wait for the STATE bit in multiple MDSTATn to change to the required state of
all modules that were set in step 2. For the video port, wait for the STATE bit in MDSTAT16
and MDSTAT17 to change to the required state.
To put the DSP in the software reset disable (SwRstDisable) state, see Section 12.5.3.2.1; in
the synchronous reset (SyncReset) state, see Section 12.5.3.2.2; in the DSP module clock
off (Disable) state, see Section 12.5.2.2; in the DSP module clock on (Enable) state, see
Section 12.5.2.1.
64
Power and Sleep Controller (PSC)
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Copyright © 2010, Texas Instruments Incorporated
IcePick Emulation Support in the PSC
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6.4
IcePick Emulation Support in the PSC
The PSC supports IcePick commands that allow IcePick aware emulation tools to have some control over
the state of power domains and modules.
In particular, the PSC supports the following IcePick emulation commands:
Table 6-3. IcePick Emulation Commands
Power On and
Enable Features
Power On and Enable Descriptions
Reset Features
Reset Descriptions
Inhibit Sleep
Allows emulation to prevent software from
transitioning the power domain out of the on
state and to prevent software from transitioning
the module out of the enable state
Assert Reset
Allows emulation to assert the
module’s local reset.
Force Power
Allows emulation to force the power domain into Wait Reset
an on state
Allows emulation to keep local
reset asserted for an extended
period of time after software
initiates local reset de-assert.
Force Active
Allows emulation to force the power domain into Block Reset
an on state and force the module into the
enable state.
Allows emulation to block
software initiated local and
module resets.
NOTE: In the DM646x DMSoC, there is only one power domain (Always On), so all IcePick
commands do not have any control on the power domain and only control module states and
resets.
When emulation tools remove the above commands, the PSC immediately executes a state
transition based on the current values in the NEXT bit in the power domain control n register
(PDCTLn) and the NEXT bit in the module control n register (MDCTLn), as set by software.
6.5
PSC Interrupts
The PSC has one interrupt (Table 6-4) to the ARM interrupt controller (AINTC). The PSC interrupt is
generated when certain IcePick emulation events occur.
Table 6-4. PSC Interrupt
ARM Event
47
Acronym
Source
PSCINT
PSC
6.5.1 Interrupt Events
The PSC interrupt is generated when any of the following events occur:
• Module State Emulation Event
• Module Local Reset Emulation Event
These interrupt events are summarized in Table 6-5 and described in more detail in this section.
Table 6-5. PSC Interrupt Events
Interrupt Enable Bits
Control Register
Enable Bit
Interrupt Condition
MDCTLn
EMUIHBIE
Interrupt occurs when the emulation alters the module state
MDCTLn
EMURSTIE
Interrupt occurs when the emulation alters the module's local reset
SPRUEP9E – August 2010
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65
PSC Interrupts
6.5.1.1
www.ti.com
Module State Emulation Events
A module state emulation event occurs when emulation alters the state of a module. Status is reflected in
the EMUIHB bit in the module status n register (MDSTATn). In particular, a module state emulation event
occurs under the following conditions:
• When inhibit sleep is asserted by emulation and software attempts to transition the module out of the
enable state
• When force active is asserted by emulation and the module is not already in the enable state
6.5.1.2
Module Local Reset Emulation Events
A local reset emulation event occurs when emulation alters the local reset of a module. Status is reflected
in the EMURST bit in the module status n register (MDSTATn). In particular, a module local reset
emulation event occurs under the following conditions:
• When assert reset is asserted by emulation although software deasserted the local reset
• When wait reset is asserted by emulation
• When block reset is asserted by emulation and software attempts to change the state of local reset
6.5.2 Interrupt Register Bits
The PSC interrupt enable bits are the EMUIHBIE bit and the EMURSTIE bit in the module control n
register (MDCTLn).
NOTE: To interrupt the ARM, the ARM’s power and sleep controller interrupt (PSCINT) must also
be enabled in the ARM interrupt controller (AINTC). See Chapter 8 for more information on
the ARM interrupt controller.
The PSC interrupt status bits are the M[n] bits in the module error pending register n (MERRPRn), and the
EMUIHB bit and the EMURST bit in the module status n register (MDSTATn). The status bits in
MERRPR0 and MERRPR1 are read by software to determine which module has generated an emulation
interrupt, and then software can read the corresponding status bits in MDSTATn to determine which event
caused the interrupt.
The PSC interrupt clear bits are the M[n] bits in the module error clear register n (MERRCRn).
The PSC interrupt evaluation bit is the ALLEV bit in the interrupt evaluation register (INTEVAL). When set,
this bit forces the PSC interrupt logic to re-evaluate event status. If any events are still active (if any status
bits are set) when the ALLEV bit in INTEVAL is set to 1, the PSCINT is reasserted to the ARM interrupt
controller. Set the ALLEV bit in INTEVAL before exiting your PSCINT interrupt service routine to ensure
that you do not miss any PSC interrupts while the ARM interrupts are globally disabled.
See Section 6.6 for complete descriptions of all PSC registers.
66
Power and Sleep Controller (PSC)
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Copyright © 2010, Texas Instruments Incorporated
PSC Registers
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6.5.3 Interrupt Handling
Handle the PSC interrupts as described in the following procedure:
Enable the interrupt.
1. Set the EMUIHBIE bit and the EMURSTIE bit in the module control n register (MDCTLn) to enable the
interrupt events that you want.
2. Enable the ARM power and sleep controller interrupt (PSCINT) in the ARM interrupt controller. To
interrupt the ARM, PSCINT must be enabled in the ARM interrupt controller. See Chapter 8 for more
information.
The ARM enters the interrupt service routine (ISR) when it receives the interrupt.
1. Read the M[n] bit in the module error pending register n (MERRPRn) to determine the source of the
interrupt(s).
2. For each active event that you want to service:
• Read the event status bits in the module status n register (MDSTATn), depending on the status
bits read in the previous step to determine the event that caused the interrupt.
• Service the interrupt as required by your application.
• Write a 1 to the M[n] bit in the module error clear register n (MERRCRn) to clear corresponding
status.
• Set the ALLEV bit in the interrupt evaluation register (INTEVAL). Setting this bit reasserts the
PSCINT to the ARM interrupt controller, if there are still any active interrupt events.
6.6
PSC Registers
Table 6-6 lists the memory-mapped registers for the PSC. See the device-specific data manual for the
memory address of these registers.
Table 6-6. Power and Sleep Controller (PSC) Registers
Offset
Register
Description
0h
PID
Peripheral Revision and Class Information Register
Section 6.6.1
18h
INTEVAL
Interrupt Evaluation Register
Section 6.6.2
40h
MERRPR0
Module Error Pending Register 0 (modules 0-31)
Section 6.6.3
44h
MERRPR1
Module Error Pending Register 1 (modules 32-45)
Section 6.6.4
50h
MERRCR0
Module Error Clear Register 0 (modules 0-31)
Section 6.6.5
54h
MERRCR1
Module Error Clear Register 1 (modules 32-45)
Section 6.6.6
120h
PTCMD
Power Domain Transition Command Register
Section 6.6.7
128h
PTSTAT
Power Domain Transition Status Register
Section 6.6.8
200h
PDSTAT0
Power Domain Status Register
Section 6.6.9
300h
PDCTL0
Power Domain Control Register
Section 6.6.10
800h
MDSTATn
Module Status n Register (modules 0-45)
Section 6.6.11
A00h
MDCTLn
Module Control n Register (modules 0-45)
Section 6.6.12
SPRUEP9E – August 2010
Section
Power and Sleep Controller (PSC)
Copyright © 2010, Texas Instruments Incorporated
67
PSC Registers
www.ti.com
6.6.1 Peripheral Revision and Class Information Register (PID)
The peripheral revision and class information (PID) register is shown in Figure 6-3 and described in
Table 6-7.
Figure 6-3. Peripheral Revision and Class Information Register (PID)
31
30
29
28
27
16
SCHEME
Reserved
FUNC
R-1
R-0
R-482h
15
11
10
8
7
6
5
0
RTL
MAJOR
CUSTOM
MINOR
R-3h
R-1
R-0
R-5h
LEGEND: R = Read only; -n = value after reset
Table 6-7. Peripheral Revision and Class Information Register (PID) Field Descriptions
Bit
Field
Value
Description
31-30
SCHEME
0-3h
Distinguishes between the old scheme and the current scheme. There is a spare bit to encode future
schemes.
29-28
Reserved
0
27-16
FUNC
15-11
RTL
10-8
MAJOR
0-7h
Major Revision.
7-6
CUSTOM
0-3h
Indicates a special version for a particular device.
5-0
MINOR
Reserved
0-FFFh Indicates a software compatible module family.
0-1Fh
0-3Fh
RTL Version.
Minor Revision.
6.6.2 Interrupt Evaluation Register (INTEVAL)
The interrupt evaluation register (INTEVAL) is shown in Figure 6-4 and described in Table 6-8.
Figure 6-4. Interrupt Evaluation Register (INTEVAL)
31
16
Reserved
R-0
15
1
0
Reserved
ALLEV
R-0
W-0
LEGEND: R = Read only; W= Write only; -n = value after reset
Table 6-8. Interrupt Evaluation Register (INTEVAL) Field Descriptions
Bit
31-1
0
68
Field
Reserved
Value
0
ALLEV
Description
Reserved
Evaluate PSC interrupt.
0
A write of 0 has no effect.
1
A write of 1 re-evaluates the interrupt condition.
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6.6.3 Module Error Pending Register 0 (MERRPR0)
The module error pending register 0 (MERRPR0) records pending error conditions for modules 0-31.
MERRPR0 is shown in Figure 6-5 and described in Table 6-9.
Figure 6-5. Module Error Pending Register 0 (MERRPR0)
31
0
M
R- 0
LEGEND: R = Read only; -n = value after reset
Table 6-9. Module Error Pending Register 0 (MERRPR0) Field Descriptions
Bit
Field
31-0
M[n]
Value
Description
Module interrupt status bit for modules 0-31.
0
Module n does not have error condition.
1
Module n has error condition. See the module status n register (MDSTATn) for error type
6.6.4 Module Error Pending Register 1 (MERRPR1)
The module error pending register 1 (MERRPR1) records pending error conditions for modules 32-45.
MERRPR1 is shown in Figure 6-6 and described in Table 6-10.
Figure 6-6. Module Error Pending Register 1 (MERRPR1)
31
16
Reserved
R-0
15
14
13
12
4
3
0
Reserved
M
Reserved
M
R-0
R-0
R-0
R-0
LEGEND: R = Read only; -n = value after reset
Table 6-10. Module Error Pending Register 1 (MERRPR1) Field Descriptions
Bit
31-14
13
Field
Reserved
Value
0
M[n]
12-4
Reserved
3-0
M[n]
Description
Reserved
Module interrupt status bit for module 45.
0
Module n does not have error condition.
1
Module n has error condition. See the module status n register (MDSTATn) for error type.
0
Reserved. (Modules 36-44 are reserved. See Table 6-1.)
Module interrupt status bit for modules 32-35.
0
Module n does not have error condition.
1
Module n has error condition. See the module status n register (MDSTATn) for error type.
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6.6.5 Module Error Clear Register 0 (MERRCR0)
The module error clear register 0 (MERRCR0) clears the corresponding interrupt bit set (M[n]) in the
module error pending register 0 (MERRPR0) and the module status n register (MDSTATn) interrupt bit
field for modules 0-31. MERRCR0 is shown in Figure 6-7 and described in Table 6-11.
Figure 6-7. Module Error Clear Register 0 (MERRCR0)
31
0
M
W-0
LEGEND: W = Write only; -n = value after reset
Table 6-11. Module Error Clear Register 0 (MERRCR0) Field Descriptions
Bit
Field
31-0
M[n]
Value
Description
Module interrupt clear bit for modules 0-31.
0
A write of 0 has no effect.
1
Clears module interrupt n.
6.6.6 Module Error Clear Register 1 (MERRCR1)
The module error clear register 1 (MERRCR1) clears the corresponding interrupt bit set (M[n]) in the
module error pending register 1 (MERRPR1) and the module status n register (MDSTATn) interrupt bit
field for modules 32-45. MERRCR1 is shown in Figure 6-8 and described in Table 6-12.
Figure 6-8. Module Error Pending Register 1 (MERRCR1)
31
16
Reserved
R-0
15
14
13
12
4
3
0
Reserved
M
Reserved
M
R-0
R-0
R-0
R-0
LEGEND: R = Read only; -n = value after reset
Table 6-12. Module Error Clear Register 1 (MERRCR1) Field Descriptions
Bit
31-14
13
70
Field
Reserved
Value
0
M[n]
12-4
Reserved
3-0
M[n]
Description
Reserved
Module interrupt clear bit for module 45.
0
A write of 0 has no effect.
1
Clears module interrupt n.
0
Reserved. (Modules 36-44 are reserved. See Table 6-1.)
Module interrupt clear bit for modules 32-35.
0
A write of 0 has no effect.
1
Clears module interrupt n.
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6.6.7 Power Domain Transition Command Register (PTCMD)
The power domain transition command register (PTCMD) is shown in Figure 6-9 and described in
Table 6-13.
Figure 6-9. Power Domain Transition Command Register (PTCMD)
31
16
Reserved
R-0
15
1
0
Reserved
GO
R-0
W-0
LEGEND: R = Read only; W = Write only; -n = value after reset
Table 6-13. Power Domain Transition Command Register (PTCMD) Field Descriptions
Bit
31-1
0
Field
Value
Reserved
0
Description
Reserved
GO
Always On Power domain GO transition command.
0
A write of 0 has no effect.
1
Writing 1 causes the PSC to evaluate all the NEXT fields relevant to this power domain (including the
NEXT bit in the module control n register (MDCTLn) for all the modules residing on this domain). If any
of the NEXT fields are not matching the corresponding current state (the STATE bit in the module status
n register (MDSTATn)), the PSC will transition those respective domain/modules to the new NEXT
state.
6.6.8 Power Domain Transition Status Register (PTSTAT)
The power domain transition status register (PTSTAT) is shown in Figure 6-10 and described in
Table 6-14 .
Figure 6-10. Power Domain Transition Status Register (PTSTAT)
31
16
Reserved
R-0
15
1
0
Reserved
GOSTAT
R-0
R-0
LEGEND: R = Read only; -n = value after reset
Table 6-14. Power Domain Transition Status Register (PTSTAT) Field Descriptions
Bit
Field
31-1
Reserved
0
GOSTAT
Value
0
Description
Reserved
Always On Power domain transition status.
0
No transition in progress.
1
Modules in Always On power domain are transitioning. Always On Power domain is transitioning.
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6.6.9 Power Domain Status Register (PDSTAT0)
The power domain status register (PDSTAT0) is shown in Figure 6-11 and described in Table 6-15.
Figure 6-11. Power Domain Status Register (PDSTAT0)
31
16
Reserved
R-0
15
11
10
9
8
Reserved
12
EMUIHB
Reserved
PORDONE
POR
7
Reserved
5
4
STATE
0
R-0
R-0
R-0
R-0
R-0
R-0
R-0
LEGEND: R = Read only; -n = value after reset
Table 6-15. Power Domain Status Register (PDSTAT0) Field Descriptions
Bit
Field
31-12
Reserved
11
EMUIHB
10
Reserved
9
PORDONE
8
72
Value
0
Reserved
4-0
STATE
Reserved
Emulation alters domain state.
0
Interrupt is not active.
1
Interrupt is active.
0
Reserved
Power_On_Reset (POR) Done status
0
Power domain POR is not done.
1
Power domain POR is done.
POR
7-5
Description
Power Domain Power_On_Reset (POR) status. This bit reflects the POR status for this power domain
including all modules in the domain.
0
Power domain POR is asserted.
1
Power domain POR is de-asserted.
0
Reserved
Power Domain Status
0
Power domain is in the off state.
1
Power domain is in the on state.
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PSC Registers
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6.6.10 Power Domain Control Register (PDCTL0)
The power domain control register (PDCTL0) is shown in Figure 6-12 and described in Table 6-16.
Figure 6-12. Power Domain Control Register (PDCTL0)
31
16
Reserved
R-0
15
10
9
Reserved
8
7
Reserved
R-0
R/W-0
R/W-0
1
0
Reserved
NEXT
R-0
R/W-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 6-16. Power Domain Control Register (PDCTL0) Field Descriptions
Bit
Field
Value
Description
31-10
Reserved
0
Reserved
9-8
Reserved
0
Reserved. Always write 0 to these bits.
7-1
Reserved
0
Reserved
0
NEXT
Power domain next state. In the DM646x DMSoC, there is only one power domain (Always On) .The
Always On power domain is always in the ON state when the chip is powered-on. This field has no
effect.
0
Power domain off.
1
Power domain on.
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6.6.11 Module Status n Register (MDSTAT0-MDSTAT45)
The module status n register (MDSTATn) shows the status of each module. Each module has one
dedicated register. MDSTATn is shown in Figure 6-13 and described in Table 6-17.
Figure 6-13. Module Status n Register (MDSTATn)
31
18
15
13
17
16
Reserved
EMUIHB
EMURST
R-0
R-0
R-0
12
11
10
9
8
Reserved
MCKOUT
MRSTDONE
MRST
LRSTDONE
LRST
Reserved
7
6
5
STATE
0
R-0
R-0
R-0
R-0
R-0
R-0
R-0
R-0
LEGEND: R = Read only; -n = value after reset
Table 6-17. Module Status n Register (MDSTATn) Field Descriptions
Bit
Field
31-18
Reserved
17
EMUIHB
16
Reserved
12
MCKOUT
10
9
8
0
Interrupt is not active.
1
Interrupt is active.
Emulation alters module reset interrupt status.
0
Interrupt is not active.
1
Interrupt is active.
0
Reserved
Module clock output status. Shows status of module clock.
0
Module clock is off.
1
Module clock is on.
Module reset done. Software is responsible for checking that mode reset is done before accessing
the module.
0
Module reset is not done.
1
Module reset is done.
MRST
Module reset status. Reflects actual state of module reset.
0
Module reset is asserted.
1
Module reset is deasserted.
LRSTDONE
Local reset done. Software is responsible for checking if local reset is done before accessing this
module.
0
Local reset is not done.
1
Local reset is done.
LRST
Reserved
5-0
STATE
Module local reset status (this bit applies to the DSP, HDVICP0 and HDVICP1 modules only).
0
Local reset is asserted.
1
Local reset is deasserted.
0
Reserved
0-3Fh
Module state status: indicates current module status.
0
SwRstDisable state
1h
SyncReset state
2h
Disable state
3h
Enable state
4h-3Fh
74
Reserved
Emulation alters module state interrupt status.
MRSTDONE
7-6
Description
0
EMURST
15-13
11
Value
Indicates transition
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6.6.12 Module Control n Register (MDCTL0-MDCTL45)
The module control n register (MDCTLn) provides specific control for an individual module. Each module
has one dedicated register. MDCTLn is shown in Figure 6-14 and described in Table 6-18.
Figure 6-14. Module Control n Register (MDCTLn)
31
16
Reserved
R- 0
15
10
9
8
Reserved
11
EMUIHBIE
EMURSTIE
LRST
7
Reserved
3
2
NEXT
0
R- 0
R/W- 0
R/W- 0
R/W- 0
R- 0
R/W- 0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 6-18. Module Control n Register (MDCTLn) Field Descriptions
Bit
Field
31-11
Reserved
10
EMUIHBIE
9
8
Value
0
Emulation alters module state interrupt enable.
Interrupt is disabled.
1
Interrupt is enabled.
Emulation alters module reset interrupt enable.
0
Interrupt is disabled.
1
Interrupt is enabled.
LRST
Reserved
2-0
NEXT
Reserved
0
EMURSTIE
7-3
Description
Module local reset control (this bit applies to the DSP, HDVICP0 and HDVICP1 modules only.)
0
Local reset is asserted.
1
Local reset is deasserted.
0
Reserved
0-3h
Module next state.
0
SwRstDisable state
1h
SyncReset state
2h
Disable state
3h
Enable state
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Chapter 7
SPRUEP9E – August 2010
Power Management
Topic
7.1
7.2
7.3
7.4
7.5
7.6
...........................................................................................................................
Overview ..........................................................................................................
PSC and PLLC Overview ....................................................................................
Clock Management ............................................................................................
ARM and DSP Sleep Mode Management ..............................................................
I/O Management ................................................................................................
USB Phy Power Down ........................................................................................
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Power Management
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Page
78
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79
79
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Overview
7.1
www.ti.com
Overview
In many applications, there may be specific requirements to minimize power consumption for both power
supply (or battery) and thermal considerations. There are two components to power consumption: active
power and leakage power. Active power is the power consumed to perform work and scales roughly with
clock frequency and the amount of computations being performed. Active power can be reduced by
controlling the clocks in such a way either to operate at a clock setting just high enough to complete the
required operation in the required timeline or to run at a clock setting until the work is complete and then
drastically cut the clocks (that is, to PLL Bypass mode) until additional work must be performed. Leakage
power is due to static current leakage and occurs regardless of the clock rate. Leakage, or standby power,
is unavoidable while power is applied and scales roughly with the operating junction temperatures.
Leakage power can only be avoided by removing power completely from a device.
The TMS320DM646x DMSoC has several means of managing the power consumption, as detailed in the
following sections. There is extensive use of automatic clock gating in the design as well as
software-controlled module clock gating to not only reduce the clock tree power, but to also reduce
module power by basically freezing its state while not operating. Clock management allows you to slow
down the clocks on the chip in order to reduce switching power. In particular, the DM646x DMSoC
includes all of the power management features described in Table 7-1.
Table 7-1. Power Management Features
Power Management Features
Description
PLL power-down
The PLLs can be powered-down when not in use to reduce switching power
Module clock ON/OFF
Module clocks can be turned on/off to reduce switching power
Module clock frequency scaling
Module clock frequency can be scaled to reduce switching power
ARM Wait-for-Interrupt sleep mode
Disable ARM clock to reduce active power
DSP sleep modes
The DSP can be put into sleep mode to reduce switching power
3.3 Volt I/O power-down
The 3.3 V I/Os can be powered-down to reduce I/O cell power
USB Phy power-down
The USB Phy can be powered-down to reduce USB I/O power
Clock Management
ARM and DSP Sleep Management
I/O Management
7.2
PSC and PLLC Overview
The power and sleep controller (PSC) plays an important role in managing system clock on/off, and reset.
Similarly, the PLL controller (PLLC) plays an important role in device clock generation. The PSC and the
PLLC are mentioned throughout this chapter. For detailed information on the PSC, see Chapter 6. For
detailed information on the PLLC, see Chapter 5 and the device-specific data manual.
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Clock Management
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7.3
Clock Management
7.3.1 Module Clock ON/OFF
The module clock on/off feature allows software to disable clocks to module individually, in order to reduce
the module's active power consumption to 0. The DM646x DMSoC is designed in full static CMOS; thus,
when a module clock stops, the module's state is preserved. When the clock is restarted, the module
resumes operating from the stopping point.
NOTE: Stopping clocks to a module only affects active power consumption, it does not affect
leakage power consumption.
If a module's clock(s) is stopped while the configuration bus or the EDMA bus is accessing it, the access
may not occur, and could potentially lock-up the bus. Ensure that all of the transactions to the module are
finished prior to stopping the clocks.
The power and sleep controller (PSC) controls module clock gating. The procedure to turn module clocks
on/off is described in Chapter 6.
7.3.2 Module Clock Frequency Scaling
Module clock frequency is scalable by programming the PLL's multiply and divide parameters. Reducing
the clock frequency reduces the active switching power consumption linearly with frequency. It has no
impact on leakage power consumption.
Chapter 5 describes how to program the PLL frequency and the frequency constraints.
7.3.3 PLL Bypass and Power Down
The PLLs can be bypassed in the DM646x DMSoC. Bypassing the PLLs sends the PLL reference clock to
the post dividers of the PLLC instead of to the PLL VCO output. The PLL reference clock is the input clock
source at DEV_MXI; therefore, this bypass mode can be used to reduce the core and module clock
frequencies to very low maintenance levels without using the PLL during periods of very low system
activity. Furthermore, the PLL can be powered down in bypass mode to save additional active power.
Chapter 5 describes PLL bypass and PLL power down details.
7.4
ARM and DSP Sleep Mode Management
7.4.1 ARM Wait-For-Interrupt Sleep Mode
The ARM module cannot have its clock gated in the PSC module. However, the ARM includes a special
sleep mode called “wait-for-interrupt”. When the wait-for-interrupt mode is enabled, the clock to the CPU
core is shut off and the ARM9 is completely inactive and only resumes operation after receiving an
interrupt. This mode does not affect leakage consumption.
You can enable the wait-for-interrupt mode via the CP15 register #7 using the following instruction:
• mcr p15, #0, rd, c7, c0, #4
The following sequence exemplifies how to enter wait-for-interrupt mode:
• Enable any interrupt (for example, an external interrupt).
• Enable wait-for-interrupt mode using the following CP15 instruction:
– mcr p15, #0, rd, c7, c0, #4
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The following sequence describes the procedure to wake up from the wait-for-interrupt mode:
• To wake up from the wait-for-interrupt mode, trigger any enabled interrupt (for example, an external
interrupt).
• The ARM’s PC jumps to the IRQ vector and you must handle the interrupt in an interrupt service
routine (ISR).
Exit the ISR and continue normal program execution starting from the instruction immediately following the
instruction that enabled wait-for-interrupt mode: mcr p15, #0, r3, c7, c0, #4.
NOTE: The ARM interrupt controller and the module sourcing the wakeup interrupt (for example,
GPIO or watchdog timer) must not be disabled; otherwise, the device will never wake up.
For more information on this sleep mode, refer to the ARM926EJ-S Technical Reference
Manual, which is available from ARM Ltd. at www.arm.com.
7.4.2 DSP Sleep Modes
The C64x+ megamodule of the DSP subsystem includes a power-down controller (PDC). The power-down
controller can power-down all of the following components of the C64x+ megamodule and internal
memories of the DSP subsystem:
• C64x+ CPU
• Program Memory Controller (PMC)
• Data Memory Controller (DMC)
• Unified Memory Controller (UMC)
• Extended Memory Controller (EMC)
• L1P Memory
• L1D Memory
• L2 Memory
Although the C64x+ megamodule documentation mentions both dynamic and static power-down, the
DM646x DMSoC supports only static power-down.
• Static power-down: PDC initiates power-down of the entire C64x+ megamodule and all internal
memories immediately upon command from software.
Static power-down affects all components of the C64x+ megamodule and all internal memories. Software
can initiate static power-down via a register bit in the PDC register.
For more information on the DSP subsystem, see the TMS320DM646x DMSoC DSP Subsystem
Reference Guide (SPRUEP8).
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I/O Management
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7.5
I/O Management
7.5.1 3.3 V I/O Power-Down
The 3.3 V I/O drivers are fabricated out of 1.8 V transistors with design techniques that require a DC bias
current. These I/O cells have a power-down mode that turns off the DC current. The VDD3P3V_PWDN
register in the System Module controls power to the 3.3V I/O cells. The 3.3V I/Os are separated into
functional groups for independent control different modules. For these groups, only the I/O cells needed
for Host/AEMIF boot or power up operations are powered up by default (CLKOUT, boot configuration pins,
PCI/HPI/AEMIF Blocks, GPIO Block). All other I/O cells are powered down by default to save power.
NOTE: If any of these I/O pins are needed for the application, be sure that application code starts
out by programming the corresponding bits in VDD3P3V_PWDN to 0 to power up the I/O
cells.
See the device-specific data manual for details on the VDD3P3V_PWDN register.
7.6
USB Phy Power Down
You can power-down the USB Phy peripheral when it is not in use. The USB Phy is powered-down via the
PHYPDWN bit in the USBCTL register of the system control module. USBCTL is described in the
device-specific data manual.
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Chapter 8
SPRUEP9E – August 2010
ARM Interrupt Controller (AINTC)
Topic
8.1
8.2
8.3
8.4
...........................................................................................................................
Introduction ......................................................................................................
Interrupt Mapping ..............................................................................................
AINTC Methodology ...........................................................................................
AINTC Registers ................................................................................................
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ARM Interrupt Controller (AINTC)
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Page
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Introduction
8.1
www.ti.com
Introduction
The TMS320DM646x DMSoC ARM interrupt controller (AINTC) has the following features:
• Supports up to 64 interrupt channels (16 external channels)
• Interrupt mask for each channel
• Each interrupt channel is mappable to a Fast Interrupt Request (FIQ) or to an Interrupt Request (IRQ)
type of interrupt.
• Hardware prioritization of simultaneous interrupts
• Configurable interrupt priority (2 levels of FIQ and 6 levels of IRQ)
• Configurable interrupt entry table (FIQ and IRQ priority table entry) to reduce interrupt processing time
The ARM core supports two interrupt types: FIQ and IRQ. See the ARM926EJ Technical Reference
Manual for detailed information about the ARM’s FIQ and IRQ interrupts. Each interrupt channel is
mappable to an FIQ or to an IRQ type of interrupt, and each channel can be enabled or disabled. The
AINTC supports user-configurable interrupt-priority and interrupt entry addresses. Entry addresses
minimize the time spent jumping to interrupt service routines (ISRs). When an interrupt occurs, the
corresponding highest priority ISR’s address is stored in the AINTC’s ENTRY register. The IRQ or FIQ
interrupt routine can read the ENTRY register and jump to the corresponding ISR directly. Thus, the ARM
does not require a software dispatcher to determine the asserted interrupt.
8.2
Interrupt Mapping
The ARM926EJ CPU core supports 2 direct interrupts: FIQ and IRQ. The ARM interrupt controller (AINTC)
prioritizes up to 64 interrupt requests from various peripherals and subsystems, listed in Table 8-1, and
interrupts the ARM CPU. Each interrupt is programmable for up to 8 priority levels (6 levels for IRQ and 2
levels for FIQ). Interrupts at the same priority level are serviced in order by the ARM interrupt number,
with the lowest number having the highest priority.
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Interrupt Mapping
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Table 8-1. ARM Interrupt Map
ARM
Interrupt
Number
ARM
Interrupt
Number
Acronym
Source
Acronym
Source
0
VP_VERTINT0
VPIF
32
TINTL0
Timer 0 lower – TINT12
1
VP_VERTINT1
VPIF
33
TINTH0
Timer 0 upper – TINT34
2
VP_VERTINT2
VPIF
34
TINTL1
Timer 1 lower – TINT12
3
VP_VERTINT3
VPIF
35
TINTH1
Timer 1 upper – TINT34
4
VP_ERRINT
VPIF
36
PWMINT0
PWM 0
5
-
Reserved
37
PWMINT1
PWM 1
6
-
Reserved
38
VLQINT
VLYNQ
7
WDINT
WD Timer (TIMER 2) –
TINT12
39
I2CINT
I2C
8
CRGENINT0
CRGEN 0
40
UARTINT0
UART 0
9
CRGENINT1
CRGEN 1
41
UARTINT1
UART 1
10
TSINT0
TSIF 0
42
UARTINT2
UART 2
11
TSINT1
TSIF 1
43
SPINT0
SPI
12
VDCEINT
VDCE
44
SPINT1
SPI
13
USBINT
USB
45
DSP2ARM0
DSP Controller to ARM
14
USBDMAINT
USB DMA
46
-
Reserved
15
PCIINT
PCI
47
PSCINT
Power and Sleep
Controller
16
CCINT0
EDMA CC Region 0
48
GPIO0
GPIO
17
CCERRINT
EDMA CC Error
49
GPIO1
GPIO
18
TCERRINT0
EDMA TC 0 Error
50
GPIO2
GPIO
19
TCERRINT1
EDMA TC 1 Error
51
GPIO3
GPIO
20
TCERRINT2
EDMA TC 2 Error
52
GPIO4
GPIO
21
TCERRINT3
EDMA TC 3 Error
53
GPIO5
GPIO
22
IDEINT
ATA
54
GPIO6
GPIO
23
HPIINT
HPI
55
GPIO7
GPIO
24
MAC_RXTH
EMAC Receive
Threshold
56
GPIOBNK0
GPIO Bank 0
25
MAC_RX
EMAC Receive
57
GPIOBNK1
GPIO Bank 1
26
MAC_TX
EMAC Transmit
58
GPIOBNK2
GPIO Bank 2
27
MAC_MISC
EMAC Miscellaneous
59
DDRINT
DDR2 Memory Controller
28
AXINT0
McASP0 Transmit
60
EMIFAINT
EMIFA
29
ARINT0
McASP0 Receive
61
COMMTX
ARMSS
30
AXINT1
McASP1 Transmit
62
COMMRX
ARMSS
31
-
Reserved
63
EMUINT
E2ICE
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Copyright © 2010, Texas Instruments Incorporated
85
AINTC Methodology
8.3
www.ti.com
AINTC Methodology
AINTC methodology is illustrated in Figure 8-1 and described below.
• When an interrupt occurs, the status is reflected in either the FIQn or the IRQn registers, depending
upon the interrupt type selected.
• Interrupts are enabled or disabled (masked) by setting the EINTn register.
NOTE:
•
•
Even if an interrupt is masked, the status interrupt is still reflected in the FIQn and the IRQn
registers.
When an interrupt from any interrupt channel occurs (for which interrupt is enabled), an IRQ or FIQ
interrupt generates to the ARM926EJ core (depending on whether the interrupt channel is mapped to
IRQ or FIQ interrupt). The ARM then branches to the IRQ or FIQ interrupt routine.
The AINTC generates the entry address of the pending interrupt with the highest priority and stores the
entry address in the FIQENTRY or the IRQENTRY register, depending on whether the interrupt is
mapped to IRQ or FIQ interrupt. The IRQ or FIQ ISR can then read the entry address and its branch to
the ISR of the interrupt.
Figure 8-1. AINTC Functional Diagram
INTn
0-63
IRQ/FIQ
map 00
INTPRIn[2:1]
FIQn
IRQn
EINTn
INT
enable
IRQn
Prioritizer
To ARM
86
IRQz
FIQn
Prioritizer
EABASE
Entry
address
generator
Entry
address
generator
IRQENTRY
FIQENTRY
ARM Interrupt Controller (AINTC)
FIQz
To ARM
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Copyright © 2010, Texas Instruments Incorporated
AINTC Methodology
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8.3.1 Interrupt Mapping
Each event input is mapped to either the ARM IRQ or to the FIQ interrupt based on the priority level
selected in the INTPRIn register. Events with a priority of 0 or 1 are designated as FIQs; events with
priorities of 2-7 are designated as IRQs. The appropriate IRQ / FIQ registers capture interrupt events.
Each event causes an IRQ or FIQ to generate only if the corresponding EINT bit enables it. The EINT bit
enables or disables the event regardless of whether it is mapped to IRQ or to FIQ. The IRQ/FIQ register
always captures each event, regardless of whether the interrupt is actually enabled.
8.3.2 Interrupt Prioritization
Event priority is determined using both a fixed and a programmable prioritization scheme. The AINTC has
8 different programmable interrupt priorities. Priority 0 and priority 1 are mapped to the FIQ interrupt with
priority 0 being the highest priority. Priorities 2-7 are mapped to the IRQ interrupt (priority 2 is the highest,
priority 7 is the lowest). Each interrupt is mapped to a priority level using the INTPRIn registers. When
simultaneous events occur (multiple enabled events captured in IRQ or FIQ registers), the event with the
highest priority is the one whose entry table address is generated when sending the interrupt signal to the
ARM. When events of identical priority occur, the event with the lowest event number is treated as having
the higher priority.
8.3.3 Vector Table Entry Address Generation
To help speed up the ISR, the AINTC provides two vectors into the ARM’s interrupt entry table, which
correspond to the highest priority effective IRQ and FIQ interrupts. This vector is generated by modifying a
base address with a priority index. The priority index takes the size of each interrupt entry into account
using the following formulas:
IRQENTRY = EABASE + ((highest priority IRQ EVT# + 1) × SIZE)
FIQENTRY = EABASE + ((highest priority FIQ EVT# + 1) × SIZE)
The EABASE base address is contained in a register. The SIZE value is a programmable register field,
which selects 4, 8, 16, or 32 bytes for each interrupt table entry. The IRQENTRY or FIQENTRY register is
read by the ARM, depending on which type of interrupt it is servicing. The ARM interrupt entry table format
is shown in Figure 8-2.
Figure 8-2. Interrupt Entry Table
Address
EABASE
Interrupt entry table
Return from INT
EABASE + (1*SIZE)
Branch to INT
EABASE + (2*SIZE)
Branch to INT1
EABASE + (64*SIZE)
Branch to INT63
The highest priority effective IRQ or FIQ interrupt includes only those interrupts that are enabled by their
corresponding EINT bit by default. However, the IERAW and FERAW register bits, if set, allow the highest
priority event of any of those captured in the IRQ or FIQ register to be used in calculating IRQENTRY and
FIQENTRY, respectively (regardless of the EINT state).
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AINTC Methodology
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The IRQENTRY and FIQENTRY values are generated in real time as the interrupt events occur. Thus,
their values may change from the time that the IRQ or FIQ is sent to the ARM to the time the ARM reads
the register. They may also change immediately after a read by the ARM if a higher priority event occurs.
If no IRQ mapped effective interrupt is pending, then the IRQENTRY value reflects the EABASE value.
Similarly, if no FIQ mapped effective interrupt is pending, then the FIQENTRY value reflects the EABASE
value.
1. For the FIQENTRY:
• If FERAW is 0, FIQENTRY reflects the state of the highest priority pending enabled FIQ interrupt. If
the active FIQ interrupt is cleared in FIQn, then FIQENTRY is immediately updated with the vector
of the next highest priority pending enabled FIQ interrupt.
• If FERAW is 1, FIQENTRY reflects the state of the highest priority pending FIQ interrupt (enabled
or not). If the active FIQ interrupt is cleared in FIQn, then FIQENTRY is immediately updated with
the vector of the next highest priority pending interrupt (enabled or not).
2. For the IRQENTRY:
• If IERAW is 0, IRQENTRY reflects the state of the highest priority pending enabled IRQ interrupt. If
the active IRQ interrupt is cleared in IRQn, then IRQENTRY is immediately updated with the vector
of the next highest priority pending enabled IRQ interrupt.
• If IERAW is 1, IRQENTRY reflects the state of the highest priority pending IRQ interrupt (enabled
or not). If the active IRQ interrupt is cleared in IRQn, then IRQENTRY is immediately updated with
the vector of the next highest priority pending IRQ interrupt (pending or not).
8.3.4 Clearing Interrupts
Events cause their matching bit in the FIQ or IRQ register (depending on the event priority) to be cleared
to 0. An event is cleared by writing a 1 to the corresponding bit in the FIQ or IRQ register. Writing a 1 to
the corresponding bit sets the bit back to a 1. Writing a 0 to an event bit does not affect its value.
8.3.5 Enabling and Disabling Interrupts
The AINTC has two methods for enabling and disabling interrupts: immediate or delayed, based on the
setting of the IDMODE bit in the INTCTL register. When 0 (default), clearing an interrupt's EINT bit has an
immediate effect. The prioritizer removes the disabled interrupt from consideration and adjusts the
IRQ/FIQENTRY value correspondingly. If no other interrupts are pending, then the IRQz/FIQz output to
the ARM may also go inactive. Enabling the interrupt if it is already pending takes immediate affect. This is
shown in Figure 8-3.
Figure 8-3. Immediate Interrupt Disable/Enable
CLK
Event pulse
INTn
Enabled
EINTn
Disabled
IRQn/FIQn
Cleared
IRQz/FIQz
ENTRY EABASE
88
VECTORn
EABASE
VECTORn
ARM Interrupt Controller (AINTC)
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Copyright © 2010, Texas Instruments Incorporated
AINTC Registers
www.ti.com
If IDMODE is 1, then the EINT effect is delayed. Essentially, the active interrupt status is latched until
cleared by the ARM. If EINT is cleared, the prioritizer continues to use the interrupt and the IRQz/FIQz
remains active. Once the ARM clears the pending interrupt, further interrupts are disabled. In the same
way, setting EINT does not cause the previously pending interrupt event to become enabled until it has
been cleared first. The disable operation is shown in Figure 8-4.
Figure 8-4. Delayed Interrupt Disable
CLK
Event pulse
INTn
EINTn
Disabled
IRQn/FIQn
Cleared
IRQz/FIQz
ENTRY EABASE
8.4
VECTORn
EABASE
AINTC Registers
Table 8-2 lists the memory-mapped registers for the AINTC. See the device-specific data manual for the
memory address of these registers.
Table 8-2. ARM Interrupt Controller (AINTC) Registers
Offset
Acronym
Register Description
00h
FIQ0
Fast Interrupt Request Status Register 0
Section 8.4.1
Section
04h
FIQ1
Fast Interrupt Request Status Register 1
Section 8.4.2
08h
IRQ0
Interrupt Request Status Register 0
Section 8.4.3
0Ch
IRQ1
Interrupt Request Status Register 1
Section 8.4.4
10h
FIQENTRY
Fast Interrupt Request Entry Address Register
Section 8.4.5
14h
IRQENTRY
Interrupt Request Entry Address Register
Section 8.4.6
18h
EINT0
Interrupt Enable Register 0
Section 8.4.7
1Ch
EINT1
Interrupt Enable Register 1
Section 8.4.8
20h
INTCTL
Interrupt Operation Control Register
Section 8.4.9
24h
EABASE
Interrupt Entry Table Base Address Register
Section 8.4.10
30h
INTPRI0
Interrupt 0-7 Priority Register 0
Section 8.4.11
34h
INTPRI1
Interrupt 8-15 Priority Register 1
Section 8.4.12
38h
INTPRI2
Interrupt 16-23 Priority Register 2
Section 8.4.13
3Ch
INTPRI3
Interrupt 24-31 Priority Register 3
Section 8.4.14
40h
INTPRI4
Interrupt 32-39 Priority Register 4
Section 8.4.15
44h
INTPRI5
Interrupt 40-47 Priority Register 5
Section 8.4.16
48h
INTPRI6
Interrupt 48-55 Priority Register 6
Section 8.4.17
4Ch
INTPRI7
Interrupt 56-63 Priority Register 7
Section 8.4.18
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AINTC Registers
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8.4.1 Fast Interrupt Request Status Register 0 (FIQ0)
The fast interrupt request status register 0 (FIQ0) is shown in Figure 8-5 and described in Table 8-3.
Interrupt status of INT[31:0] (if mapped to FIQ).
Figure 8-5. Fast Interrupt Request Status Register 0 (FIQ0)
31
16
FIQ
R/W-1
15
0
FIQ
R/W-1
LEGEND: R/W = Read/Write; -n = value after reset
Table 8-3. Fast Interrupt Request Status Register 0 (FIQ0) Field Descriptions
Bit
Field
31-0
FIQ[n]
Value
Description
Interrupt status of INTn, if mapped to fast interrupt request (FIQ31-0).
0
When reading bit, interrupt occurred.
1
When writing bit, acknowledge interrupt.
8.4.2 Fast Interrupt Request Status Register 1 (FIQ1)
The fast interrupt request status register 1 (FIQ1) is shown in Figure 8-6 and described in Table 8-4.
Interrupt status of INT[63:32] (if mapped to FIQ).
Figure 8-6. Fast Interrupt Request Status Register 1 (FIQ1)
31
16
Reserved
R-1
15
0
FIQ
R/W-1
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 8-4. Fast Interrupt Request Status Register 1 (FIQ1) Field Descriptions
Bit
Field
31-16
Reserved
15-0
FIQ[n]
90
Value
1
Description
Reserved
Interrupt status of INTn, if mapped to fast interrupt request (FIQ47-32).
0
When reading bit, interrupt occurred.
1
When writing bit, acknowledge interrupt.
ARM Interrupt Controller (AINTC)
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AINTC Registers
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8.4.3 Interrupt Request Status Register 0 (IRQ0)
The interrupt request status register 0 (IRQ0) is shown in Figure 8-7 and described in Table 8-5. Interrupt
status of INT[31:0] (if mapped to IRQ).
Figure 8-7. Interrupt Request Status Register 0 (IRQ0)
31
16
IRQ
R/W-1
15
1
0
IRQ
IRQ0
R/W-1
R-1
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 8-5. Interrupt Request Status Register 0 (IRQ0) Field Descriptions
Bit
Field
31-1
IRQ[n]
0
IRQ0
Value
Description
Interrupt status of INTn, if mapped to interrupt request (IRQ31-1).
0
When reading bit, interrupt occurred.
1
When writing bit, acknowledge interrupt.
1
Interrupt 0 is always mapped to fast interrupt request (FIQ).
8.4.4 Interrupt Request Status Register 1 (IRQ1)
The interrupt request status register 1 (IRQ1) is shown in Figure 8-8 and described in Table 8-6. Interrupt
status of INT[63:32] (if mapped to IRQ).
Figure 8-8. Interrupt Request Status Register 1 (IRQ1)
31
16
Reserved
R-1
15
0
IRQ
R/W-1
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 8-6. Interrupt Request Status Register 1 (IRQ1) Field Descriptions
Bit
Field
31-16
Reserved
15-0
IRQ[n]
Value
1
Description
Reserved
Interrupt status of INTn, if mapped to fast interrupt request (IRQ47-32).
0
When reading bit, interrupt occurred.
1
When writing bit, acknowledge interrupt.
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8.4.5 Fast Interrupt Request Entry Address Register (FIQENTRY)
The fast interrupt request entry address register (FIQENTRY) is shown in Figure 8-9 and described in
Table 8-7. Entry address [28:0] for valid FIQ interrupt.
Figure 8-9. Fast Interrupt Request Entry Address Register (FIQENTRY)
31
29
28
16
Reserved
FIQENTRY
R-0
R-0
15
0
FIQENTRY
R-0
LEGEND: R = Read only; -n = value after reset
Table 8-7. Fast Interrupt Request Entry Address Register (FIQENTRY) Field Descriptions
Bit
Field
Value
31-29
Reserved
28-0
FIQENTRY
0
0-1FFF FFFFh
Description
Reserved
Interrupt entry table address of the current highest-priority fast interrupt request (FIQ).
8.4.6 Interrupt Request Entry Address Register (IRQENTRY)
The interrupt request entry address register (IRQENTRY) is shown in Figure 8-10 and described in
Table 8-8. Entry address [28:0] for valid IRQ interrupt.
Figure 8-10. Interrupt Request Entry Address Register (IRQENTRY)
31
29
28
16
Reserved
IRQENTRY
R-0
R-0
15
0
IRQENTRY
R-0
LEGEND: R = Read only; -n = value after reset
Table 8-8. Interrupt Request Entry Address Register (IRQENTRY) Field Descriptions
Bit
Field
31-29
Reserved
28-0
IRQENTRY
92
Value
0
0-1FFF FFFFh
Description
Reserved
Interrupt entry table address of the current highest-priority interrupt request (IRQ).
ARM Interrupt Controller (AINTC)
SPRUEP9E – August 2010
Copyright © 2010, Texas Instruments Incorporated
AINTC Registers
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8.4.7 Interrupt Enable Register 0 (EINT0)
The interrupt enable register 0 (EINT0) is shown in Figure 8-11 and described in Table 8-9.
Figure 8-11. Interrupt Enable Register 0 (EINT0)
31
16
EINT
R/W-0
15
1
0
EINT
EINT0
R/W-0
R-1
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 8-9. Interrupt Enable Register 0 (EINT0) Field Descriptions
Bit
31-1
0
Field
Value
Description
EINT[n]
EINT0
Interrupt enable for INTn. Bits 1 through 31 represent interrupts 1-31, respectively.
0
Interrupt is disabled.
1
Interrupt is enabled.
1
Interrupt 0 is nonmaskable and is always enabled.
8.4.8 Interrupt Enable Register 1 (EINT1)
The interrupt enable register 1 (EINT1) is shown in Figure 8-12 and described in Table 8-10.
Figure 8-12. Interrupt Enable Register 1 (EINT1)
31
16
Reserved
R-0
15
0
EINT
R/W-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 8-10. Interrupt Enable Register 1 (EINT1) Field Descriptions
Bit
Field
31-16
Reserved
15-0
EINT[n]
Value
0
Description
Reserved
Interrupt enable for INTn. Bits 0 through 15 represent interrupts 32-47, respectively.
0
Interrupt is disabled.
1
Interrupt is enabled.
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8.4.9 Interrupt Operation Control Register (INTCTL)
The interrupt operation control register (INTCTL) is shown in Figure 8-13 and described in Table 8-11.
Figure 8-13. Interrupt Operation Control Register (INTCTL)
31
16
Reserved
R-0
15
2
1
0
Reserved
3
IDMODE
IERAW
FERAW
R-0
R/W-0
R/W-0
R/W-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 8-11. Interrupt Operation Control Register (INTCTL) Field Descriptions
Bit
Reserved
2
IDMODE
1
0
94
Field
31-3
Value
0
Description
Reserved
Interrupt disable mode.
0
Disable immediately.
1
Disable after acknowledgement.
IERAW
Masked interrupt reflected in the interrupt request entry address register (IRQENTRY).
0
Disable reflect.
1
Enable reflect.
FERAW
Masked interrupt reflect in the fast interrupt request entry address register (FIQENTRY).
0
Disable reflect.
1
Enable reflect.
ARM Interrupt Controller (AINTC)
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AINTC Registers
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8.4.10 Interrupt Entry Table Base Address Register (EABASE)
The interrupt entry table base address register (EABASE) is shown in Figure 8-14 and described in
Table 8-12.
Figure 8-14. Interrupt Entry Table Base Address Register (EABASE)
31
29
28
16
Reserved
EABASE
R-0
R/W-0
15
3
2
1
0
EABASE
Reserved
SIZE
R/W-0
R-0
R/W-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 8-12. Interrupt Entry Table Base Address Register (EABASE) Field Descriptions
Bit
Field
31-29
Reserved
28-3
EABASE
2
Reserved
1-0
SIZE
Value
0
Description
Reserved
0-3FF FFFFh Interrupt entry table base address (8-byte aligned).
0
0-3h
Reserved
Size of each entry in the interrupt entry table.
0
4 bytes
1h
8 bytes
2h
16 bytes
3h
32 bytes
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8.4.11 Interrupt Priority Register 0 (INTPRI0)
The interrupt priority register 0 (INTPRI0) is shown in Figure 8-15 and described in Table 8-13.
Figure 8-15. Interrupt Priority Register 0 (INTPRI0)
31
30
28
27
26
24
23
22
20
19
18
16
Reserved
INT7
Reserved
INT6
Reserved
INT5
Reserved
INT4
R-0
R/W-7h
R-0
R/W-7h
R-0
R/W-7h
R-0
R/W-7h
15
14
12
11
10
8
7
6
4
3
2
0
Reserved
INT3
Reserved
INT2
Reserved
INT1
Reserved
INT0
R-0
R/W-7h
R-0
R/W-7h
R-0
R/W-7h
R-0
R/W-7h
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 8-13. Interrupt Priority Register 0 (INTPRI0) Field Descriptions
Bit
Field
Value
Reserved
0
INTn
0-7h
Description
Reserved
Selects INTn priority level.
8.4.12 Interrupt Priority Register 1 (INTPRI1)
The interrupt priority register 1 (INTPRI1) is shown in Figure 8-16 and described in Table 8-14.
Figure 8-16. Interrupt Priority Register 1 (INTPRI1)
31
30
28
27
26
24
23
22
20
19
18
16
Reserved
INT15
Reserved
INT14
Reserved
INT13
Reserved
INT12
R-0
R/W-7h
R-0
R/W-7h
R-0
R/W-7h
R-0
R/W-7h
15
14
12
11
10
8
7
6
4
3
2
0
Reserved
INT11
Reserved
INT10
Reserved
INT9
Reserved
INT8
R-0
R/W-7h
R-0
R/W-7h
R-0
R/W-7h
R-0
R/W-7h
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 8-14. Interrupt Priority Register 1 (INTPRI1) Field Descriptions
Bit
Field
Reserved
INTn
96
Value
0
0-7h
Description
Reserved
Selects INTn priority level.
ARM Interrupt Controller (AINTC)
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AINTC Registers
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8.4.13 Interrupt Priority Register 2 (INTPRI2)
The interrupt priority register 2 (INTPRI2) is shown in Figure 8-17 and described in Table 8-15.
Figure 8-17. Interrupt Priority Register 2 (INTPRI2)
31
30
28
27
26
24
23
22
20
19
18
16
Reserved
INT23
Reserved
INT22
Reserved
INT21
Reserved
INT20
R-0
R/W-7h
R-0
R/W-7h
R-0
R/W-7h
R-0
R/W-7h
15
14
12
11
10
8
7
6
4
3
2
0
Reserved
INT19
Reserved
INT18
Reserved
INT17
Reserved
INT16
R-0
R/W-7h
R-0
R/W-7h
R-0
R/W-7h
R-0
R/W-7h
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 8-15. Interrupt Priority Register 2 (INTPRI2) Field Descriptions
Bit
Field
Value
Reserved
0
INTn
0-7h
Description
Reserved
Selects INTn priority level.
8.4.14 Interrupt Priority Register 3 (INTPRI3)
The interrupt priority register 3 (INTPRI3) is shown in Figure 8-18 and described in Table 8-16.
Figure 8-18. Interrupt Priority Register 3 (INTPRI3)
31
30
28
27
26
24
23
22
20
19
18
16
Reserved
INT31
Reserved
INT30
Reserved
INT29
Reserved
INT28
R-0
R/W-7h
R-0
R/W-7h
R-0
R/W-7h
R-0
R/W-7h
15
14
12
11
10
8
7
6
4
3
2
0
Reserved
INT27
Reserved
INT26
Reserved
INT25
Reserved
INT24
R-0
R/W-7h
R-0
R/W-7h
R-0
R/W-7h
R-0
R/W-7h
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 8-16. Interrupt Priority Register 3 (INTPRI3) Field Descriptions
Bit
Field
Reserved
INTn
Value
0
0-7h
Description
Reserved
Selects INTn priority level.
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8.4.15 Interrupt Priority Register 4 (INTPRI4)
The interrupt priority register 4 (INTPRI4) is shown in Figure 8-19 and described in Table 8-17.
Figure 8-19. Interrupt Priority Register 4 (INTPRI4)
31
30
28
27
26
24
23
22
20
19
18
16
Reserved
INT39
Reserved
INT38
Reserved
INT37
Reserved
INT36
R-0
R/W-7h
R-0
R/W-7h
R-0
R/W-7h
R-0
R/W-7h
15
14
12
11
10
8
7
6
4
3
2
0
Reserved
INT35
Reserved
INT34
Reserved
INT33
Reserved
INT32
R-0
R/W-7h
R-0
R/W-7h
R-0
R/W-7h
R-0
R/W-7h
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 8-17. Interrupt Priority Register 4 (INTPRI4) Field Descriptions
Bit
Field
Value
Reserved
0
INTn
0-7h
Description
Reserved
Selects INTn priority level.
8.4.16 Interrupt Priority Register 5 (INTPRI5)
The interrupt priority register 5 (INTPRI5) is shown in Figure 8-20 and described in Table 8-18.
Figure 8-20. Interrupt Priority Register 5 (INTPRI5)
31
30
28
27
26
24
23
22
20
19
18
16
Reserved
INT47
Reserved
INT46
Reserved
INT45
Reserved
INT44
R-0
R/W-7h
R-0
R/W-7h
R-0
R/W-7h
R-0
R/W-7h
15
14
12
11
10
8
7
6
4
3
2
0
Reserved
INT43
Reserved
INT42
Reserved
INT41
Reserved
INT40
R-0
R/W-7h
R-0
R/W-7h
R-0
R/W-7h
R-0
R/W-7h
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 8-18. Interrupt Priority Register 5 (INTPRI5) Field Descriptions
Bit
Field
Reserved
INTn
98
Value
0
0-7h
Description
Reserved
Selects INTn priority level.
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8.4.17 Interrupt Priority Register 6 (INTPRI6)
The interrupt priority register 6 (INTPRI6) is shown in Figure 8-21 and described in Table 8-19.
Figure 8-21. Interrupt Priority Register 6 (INTPRI6)
31
30
28
27
26
24
23
22
20
19
18
16
Reserved
INT55
Reserved
INT54
Reserved
INT53
Reserved
INT52
R-0
R/W-7h
R-0
R/W-7h
R-0
R/W-7h
R-0
R/W-7h
15
14
12
11
10
8
7
6
4
3
2
0
Reserved
INT51
Reserved
INT50
Reserved
INT49
Reserved
INT48
R-0
R/W-7h
R-0
R/W-7h
R-0
R/W-7h
R-0
R/W-7h
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 8-19. Interrupt Priority Register 6 (INTPRI6) Field Descriptions
Bit
Field
Value
Reserved
0
INTn
0-7h
Description
Reserved
Selects INTn priority level.
8.4.18 Interrupt Priority Register 7 (INTPRI7)
The interrupt priority register 7 (INTPRI7) is shown in Figure 8-22 and described in Table 8-20.
Figure 8-22. Interrupt Priority Register 7 (INTPRI7)
31
30
28
27
26
24
23
22
20
19
18
16
Reserved
INT63
Reserved
INT62
Reserved
INT61
Reserved
INT60
R-0
R/W-7h
R-0
R/W-7h
R-0
R/W-7h
R-0
R/W-7h
15
14
12
11
10
8
7
6
4
3
2
0
Reserved
INT59
Reserved
INT58
Reserved
INT57
Reserved
INT56
R-0
R/W-7h
R-0
R/W-7h
R-0
R/W-7h
R-0
R/W-7h
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 8-20. Interrupt Priority Register 7 (INTPRI7) Field Descriptions
Bit
Field
Reserved
INTn
Value
0
0-7h
Description
Reserved
Selects INTn priority level.
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Chapter 9
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System Control Module
Topic
9.1
9.2
9.3
9.4
9.5
9.6
9.7
9.8
9.9
9.10
...........................................................................................................................
Overview of the System Control Module .............................................................
Device Identification ........................................................................................
Device Configuration .......................................................................................
ARM-DSP Integration .......................................................................................
Power Management .........................................................................................
Special Peripheral Status and Control ................................................................
Bandwidth Management ...................................................................................
Emulation Control ............................................................................................
Clock and Oscillator Control .............................................................................
System Control Register Descriptions ................................................................
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103
103
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106
106
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Overview of the System Control Module
9.1
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Overview of the System Control Module
The TMS320DM646x DMSoC system control module is a system-level module containing status and
top-level control logic required by the device. The system control module consists of a set of status and
control registers, accessible by the ARM (and DSP), supporting all of the following system features and
operations:
• Device Identification
• Device Configuration
– Pin multiplexing control
– Device boot configuration status
– Device boot process status
• ARM-DSP Integration
– ARM-DSP interrupt control and status
– DSP boot address control and status
• Power Management
– VDD 3.3 V I/O power-down control
• Special Peripheral Status and Control
– Universal serial bus (USB) interface control
– Host port interface (HPI) control
– Video clock control
– Transport stream interface (TSIF) control
– Video and TSIF clock disable
– PWM control
– EDMA3 transfer controller (EDMA3TC) default burst size configuration
– ARM memory wait state control
• Bandwidth Management
– Bus master DMA priority control
• Emulation Control
– Set emulator suspend source
• Device Unique ID
– 128-bit ID, unique to each device, suitable for digital rights management (DRM) implementation
• Clock and oscillator control
This chapter describes the system control module.
9.2
Device Identification
The JTAG ID register (JTAGID) of the System Control Module contains a software readable version of the
JTAG/Device ID. Software can use this register to determine the version of the device on which it is
executing. The register format and description are shown in the device-specific data manual.
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9.3
Device Configuration
The system control module contains registers for controlling pin multiplexing and registers that reflect the
boot configuration and boot process status.
9.3.1 Pin Multiplexing Control
The DM646x DMSoC makes extensive use of pin multiplexing to accommodate the large number of
peripheral functions in the smallest possible package. A combination of hardware configuration (at device
reset) and program control controls pin multiplexing to accomplish this. Hardware does not attempt to
ensure that the proper pin multiplexing is selected for the peripherals or that interface mode is being used.
Detailed information about the pin multiplexing and control is covered in the device-specific data manual.
9.3.2 Device Boot Configuration Status
The boot configuration status (BOOTMODE, CS2_BW, PCIEN, and DSP_BT bits) is captured in the boot
configuration register (BOOTCFG) in the System Module. See the device-specific data manual for details
on BOOTCFG.
9.3.3 Device Boot Process Status
The boot status register (BOOTSTAT) indicates the status of the device boot process (for example, boot
error, boot complete, or watchdog timer reset). See the device-specific data manual for details on
BOOTSTAT.
9.4
ARM-DSP Integration
9.4.1 ARM-DSP Interrupt Control and Status
The System Module includes registers for generating interrupts from the ARM to the DSP (DSPINT,
DSPINTSET, and DSPINTCLR) and from the DSP to the ARM (DSPINT, DSPINTSET, and DSPINTCLR).
See the device-specific data manual for details on these registers.
The ARM uses DSPINT, DSPINTSET, and DSPINTCLR to generate an interrupt to the DSP. The DSP
interrupt status register (DSPINT) shows the status of the ARM-to-DSP interrupts. The ARM may generate
an interrupt to the DSP by setting one of the four INTDSPn bits or the INTNMI bit in the DSP interrupt set
register (DSPINTSET). The interrupt set (INTDSPn) bit then self-clears and the corresponding bit in
DSPINT is automatically set to indicate that the interrupt was generated. After servicing the interrupt, the
DSP clears the status bit in DSPINT by writing a 1 to the corresponding bit in the DSP interrupt clear
register (DSPINTCLR). The ARM may poll the status bit in DSPINT to determine when the DSP has
completed the interrupt service.
The DSP may generate an interrupt to the ARM in a similar manner using the ARM interrupt set register
(ARMINTSET) and the ARM interrupt clear register (ARMINTCLR). The DSP can monitor the status of the
DSP-to-ARM interrupts using the ARM interrupt status register (ARMINT). See Chapter 12 for more
detailed information.
9.4.2 DSP Boot Address Control and Status
The DSP boot address register (DSPBOOTADDR) in the System Module contains the DSP reset vector.
See the device-specific data manual for details on DSPBOOTADDR. The boot address defaults to
4220:0000h (EMIF CS2 space) to allow DSP self-boot on power-up (selected by the DSP_BT pin), but
may be changed by the ARM for ARM-controlled booting.
For detailed information on booting the DMSoC, see Chapter 11.
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Power Management
9.5
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Power Management
9.5.1 VDD 3.3 V I/O Power-Down Control
The VDD 3.3V I/O power-down control register (VDD3P3V_PWDN) in the System Module controls power
to the 3.3 V I/O cells. The 3.3 V I/Os are separated into two groups for independent control. See the
device-specific data manual for details on VDD3P3V_PWDN.
9.6
Special Peripheral Status and Control
Several of the DM646x DMSoC peripherals require additional system-level control logic. Those registers
are discussed in this section.
9.6.1 Universal Serial Bus (USB) Interface Control
The USB control register (USBCTL) controls various features of the USB interface. See the device-specific
data manual for details on USBCTL.
9.6.2 Host Port Interface (HPI) Control
The HPI control register (HPICTL) controls write access to the HPI control and address registers and
determines the host time-out value. HPICTL also determines the output mode of the HRDY signal.
HPICTL is not reset by a soft reset, so that the HPI width remains correctly configured. See the
device-specific data manual for details on HPICTL.
9.6.3 Video Clock Control and Disable
The video clock control register (VIDCLKCTL) allows you to select/control the clock multiplexing for the
video channel (channels 1, 2, and 3) output clock source. See the device-specific data manual for details
on VIDCLKCTL.
9.6.4 Transport Stream Interface (TSIF) Control
The TSIF control register (TSIFCTL) allows you to select/control the clock multiplexing for the counter and
serial output of TSIF1 and the counter and parallel/serial output for TSIF0. See the device-specific data
manual for details on TSIFCTL.
9.6.5 Video Source Clock Control and Disable
The video source clock disable register (VSCLKDIS) allows you to disable the selected video port
interface (VPIF), transport stream interface (TSIF), and clock reference generator (CRGEN) module input
clocks. See the device-specific data manual for details on VSCLKDIS.
NOTE:
To ensure glitch-free operation, the clock should be disabled before changing the clock
source frequency or multiplexing using the video clock control register (VIDCLKCTL) and the
TSIF control register (TSIFCTL).
9.6.6 PWM Control
The PWM control register (PWMCTL) controls the chip-level connections of PWM0 and PWM1. See
device-specific data manual for details on PWMCTL.
9.6.7 EDMA3 Transfer Controller (EDMA3TC) Burst Size Configuration
The EDMA transfer controller default burst size configuration register (EDMATCCFG) configures the
default burst size (DBS) for the EDMA transfer controllers (EDMA3TC0, EDMA3TC1, EDMA3TC2, and
EDMA3TC3). See the device-specific data manual for details on EDMATCCFG.
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Bandwidth Management
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9.6.8 ARM Memory Wait State Control
The ARM memory wait state control register (ARMWAIT) is used to control ARM926 accesses to its TCM
RAM. At normal ARM operating frequency, a wait state must be inserted when accessing TCM RAM.
When the device is operating at lower speeds, performance may be increased by removing the wait state.
Note that the TCM ROM will always operate with a wait state enabled. See the device-specific data
manual for details on ARMWAIT.
9.7
Bandwidth Management
9.7.1 Bus Master DMA Priority Control
In order to determine allowed connections between masters and slaves, each master request source must
have a unique master ID (mstid) associated with it. The master ID for each DM646x DMSoC master is
shown in Table 9-1.
Table 9-1. TMS320DM646x DMSoC Master IDs
mstid
Master
0
ARM Instruction
1
ARM Data
2
DSP MDMA
3
DSP CFG
4-7
Reserved
8
HDVICP0 CFG
9
HDVICP1 CFG
10
EDMA3 CC TR
11-15
Reserved
16
EDMA3 TC0 read
17
EDMA3 TC0 write
18
EDMA3 TC1 read
19
EDMA3 TC1 write
20
EDMA3 TC2 read
21
EDMA3 TC2 write
22
EDMA3 TC3 read
23
EDMA3 TC3 write
24-31
Reserved
32
PCI
33
HPI
34
ATA
35
EMAC
36
USB
37
VLYNQ
38
VPIF mstr1 read
39
VPIF mstr0 write
40
TSIF0 read
41
TSIF0 write
42
TSIF1 read
43
TSIF1 write
44
VDCE write
45
VDCE read
46-63
Reserved
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Prioritization within each switched central resource (SCR) is selected to be either fixed or dynamic.
Dynamic prioritization is based on an incoming priority signal from each master. On the DM646x DMSoC,
all master peripherals are programmed in the bus master priority control registers (MSTRPRIn) in the
System Module. The default priority level for each bus master is listed in Table 9-2. Application software is
expected to modify these values to obtain the desired system performance.
Table 9-2. TMS320DM646x DMSoC Default Master Priorities
Default Priority Level
(1)
(2)
9.8
Bus Master
Priority Bit Field
Priority Control Register
1
VPIF Capture
VP0P
MSTPRI2 Register
1
VPIF Display
VP1P
MSTPRI2 Register
1
TSIF0
TSIF0P
MSTPRI2 Register
1
TSIF1
TSIF1P
MSTPRI2 Register
2
EDMA3TC0
EDMATC0P
MSTPRI2 Register (1)
2
EDMA3TC1
EDMATC1P
MSTPRI2 Register (1)
2
EDMA3TC2
EDMATC2P
MSTPRI2 Register (1)
2
EDMA3TC3
EDMATC3P
MSTPRI2 Register (1)
3
HDVICP0 (CFG)
HDVICP0P
MSTPRI0 Register
3
HDVICP1 (CFG)
HDVICP1P
MSTPRI0 Register
4
ARM926 (ARM Instruction)
ARMINSTP
MSTPRI0 Register
4
ARM926 (ARM Data)
ARMDATAP
MSTPRI0 Register
4
C64x+ DSP (DMA)
DSPDMAP
MSTPRI0 Register (2)
4
C64x+ DSP (CFG)
DSPCFGP
MSTPRI0 Register
4
VDCE
VDCEP
MSTPRI1 Register
5
EMAC
EMACP
MSTPRI1 Register
5
USB2.0
USBP
MSTPRI1 Register
5
ATA
ATAP
MSTPRI1 Register
5
VLYNQ
VLYNQP
MSTPRI1 Register
6
PCI
PCIP
MSTPRI1 Register
6
HPI
HPIP
MSTPRI1 Register
Default value in EDMA QUEPRI register
Default value in DSP MDMAARBE.PRI field
Emulation Control
9.8.1 Set Emulator Suspend Source
The flexibility of the DM646x DMSoC architecture allows either the ARM or the DSP to control some
various peripherals (setup registers, service interrupts, etc.). While this assignment is purely a matter of
software convention, during an emulation halt, the device must know which peripherals are associated
with the halting processor, so that only those modules receive the suspend signal. This allows peripherals
associated with the other (unhalted) processor to continue normal operation. The emulator suspend
source register (SUSPSRC) indicates the emulation suspend source for those peripherals which support
emulation suspend.
When the associated SUSPSRC bit is 0, the ARM emulator controls the peripheral’s emulation suspend
signal and when it is set to 1, the DSP emulator controls the peripheral's emulation suspend signal. See
the device-specific data manual for details on this register.
9.9
Clock and Oscillator Control
The auxiliary (24 MHz) oscillator and the clock source of the CLKOUT, AUDIO_CLK0, and AUDIO_CLK1
outputs are controlled by the clock and oscillator control register (CLKCTL). See the device-specific data
manual for details on CLKCTL.
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9.10 System Control Register Descriptions
Table 9-3 lists the memory-mapped registers for the system control. See the device-specific data manual
for the memory address of these registers and complete descriptions.
Table 9-3. System Control Registers
Offset
Acronym
Register Description
0h
PINMUX0
Pin Multiplexing Control 0
4h
PINMUX1
Pin Multiplexing Control 1
8h
DSPBOOTADDR
DSP Boot Address. Decoded by bootloader software for host boots.
Ch
SUSPSRC
Emulator Suspend Source
10h
BOOTSTAT
Boot Status
14h
BOOTCFG
Device Boot Configuration
24h
ARMBOOT
ARM926 Boot Control
28h
JTAGID
Device ID Number
30h
HPICTL
HPI Control
34h
USBCTL
USB Control
38h
VIDCLKCTL
Video Clock Control
3Ch
MSTPRI0
Bus Master Priority Control 0
40h
MSTPRI1
Bus Master Priority Control 1
44h
MSTPRI2
Bus Master Priority Control 2
48h
VDD3P3V_PWDN
VDD 3.3-V I/O Powerdown Control
50h
TSIFCTL
TSIF Control
54h
PWMCTL
PWM Control
58h
EDMATCCFG
EDMA TC Configuration
5Ch
CLKCTL
Oscillator and Output Clock Control
60h
DSPINT
ARM to DSP Interrupt Status
64h
DSPINTSET
ARM to DSP Interrupt Set
68h
DSPINTCLR
ARM to DSP Interrupt Clear
6Ch
VSCLKDIS
Video and TSIF Clock Disable
70h
ARMINT
DSP to ARM Interrupt Status
74h
ARMINTSET
DSP to ARM Interrupt Set
78h
ARMINTCLR
DSP to ARM Interrupt Clear
7Ch
ARMWAIT
ARM Memory Wait State Control
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Chapter 10
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Reset
Topic
10.1
10.2
10.3
10.4
...........................................................................................................................
Reset Overview ...............................................................................................
Reset Pins ......................................................................................................
Types of Reset ................................................................................................
Default Device Configurations ...........................................................................
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10.1 Reset Overview
There are six types of reset in the TMS320DM646x DMSoC. The types of reset differ by how they are
initiated and/or by their effect on the device. Each type is briefly described in Table 10-1 and further
described in the following sections.
Table 10-1. Reset Types
Type
Initiator
Effect
Power-on reset (POR)
POR pin active low
Total reset of the chip (cold reset). Resets all modules including
memory and emulation. Total reset of chip (cold reset). Activates
the POR signal on-chip, which resets the entire chip including
the emulation logic. POR assertion also causes internal TRST
signal to be asserted. The power-on reset (POR) must be driven
low during power-ramp of the device. Device boot and
configuration pins are latched.
Warm reset
RESET pin active low
Resets all modules including memory, except emulation logic.
Deassertion of RESET causes latching of the device boot and
configuration pins. Emulator stays alive during Warm reset.
Maximum (Max) reset
Emulator or Watchdog Timer
(Timer2)
Same as Warm reset, except the device boot and configuration
pins are not relatched.
System reset
Emulator
A soft reset. A soft reset maintains memory contents, and does
not affect or reset clocks or power states. Does not reset
emulation logic, nor relatch device boot and configuration pins.
Module reset
Software
Resets a specific module. Allows the software to independently
reset any module.
DSP local reset
ARM software
Resets the DSP CPU. The DSP internal memories (L1P, L1D,
and L2) are not reset. Allows the ARM to reset and boot the
DSP.
Test reset (TRST)
TRST pin
Test reset on JTAG interface. Drive TRST pin low to reset the
test and emulation logic (POR is also ANDed with the reset from
this pin before going to the test reset targets). For proper DSP
operation, TRST should always be 0 (active low) during normal
functional mode of operation. Also, the TRST pin is required to
be pulled high externally for proper ARM emulaton operation.
10.2 Reset Pins
Power-on reset, Warm reset, and Test reset are initiated by the POR, RESET, and TRST pins,
respectively. These pins are briefly described in Table 10-2. For more information, see the device-specific
data manual.
Table 10-2. Reset Pins
110
Pin Name
Type
Description
POR
Input
Power-on reset
RESET
Input
Active-low device reset
TRST
Input
JTAG test-port reset
Reset
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Types of Reset
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10.3 Types of Reset
10.3.1 Power-On Reset (POR)
Power-on reset (POR) is initiated by the POR pin and is used to reset the entire chip, including the test
and emulation logic. Power-on reset is also referred to as a cold reset, since the device usually goes
through a power-up cycle. During power-up, the POR pin must be asserted (driven low) until the power
supplies have reached their normal operating conditions.
The following steps describe the POR sequence:
1. Apply power and clocks to the chip and drive POR low to initiate POR.
2. Wait for the power supplies to reach normal operating conditions while keeping the POR pin asserted
(driven low).
3. Wait for the input clock source to be stable while keeping the POR pin asserted (driven low).
4. Once the power supplies and the input clock source are stable, the POR pin must remain asserted
(low) for a minimum number of DEV_MXI cycles (see device-specific data manual for number of
cycles).
5. Hardware latches the device configuration pins on the rising edge of POR. The device configuration
pins allow you to set several options at reset. See Section 10.4.1 for more information.
6. Hardware resets all of the modules, including memories and emulation circuitry.
7. POR finishes, all of the modules are now in their default configurations, and hardware begins the boot
process.
See the device-specific data manual for power sequencing and reset timing requirements.
10.3.2 Warm Reset
A Warm reset is activated by driving the RESET pin active-low. This resets everything in the device,
except the test or emulation logic. A DSP or ARM emulator session will stay alive during warm reset.
The following steps describe the Warm reset sequence:
1. Emulator drives RESET low to initiate Warm reset.
2. Emulator drives RESET high after a required minimum number of MXI clock cycles.
3. Hardware latches the device configuration pins on the rising edge of RESET. The device configuration
pins allow you to set several options at reset. See Section 10.4.1 for more information.
4. Hardware resets all of the modules including memories, but not the emulation circuitry.
5. Warm reset finishes, all of the modules except emulation logic are in their default configurations, and
hardware begins the boot process.
See the device-specific data manual for reset timing requirements.
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10.3.3 Maximum (Max) Reset
A Maximum (Max) reset is initiated by the emulator or the watchdog timer (Timer2). The effects are the
same as a Warm reset, except the device boot and configuration pins are not relatched. The emulator
initiates a Max reset via the ICEPICK module. This ICEPICK-initiated reset is nonmaskable. When the
watchdog timer counter reaches zero, this also initiates a Max reset to recover from a runaway condition.
For debug, Max reset allows an emulator to initiate chip reset using an emulation command, while
remaining active during and after the reset sequence. To invoke the Max reset via the ICEPICK module,
you can perform the following from the Code Composer Studio™ IDE menu: Debug→Advanced
Resets→System Reset.
The following steps describe the Max reset sequence:
1. To initiate Max reset, the watchdog timer expires (indicating a runaway condition), or the emulator
initiates a Max reset command via the ICEPICK module.
2. Hardware resets all of the modules including memories, but not the emulation circuitry. The device
boot and configuration pins are not relatched.
3. Warm reset finishes, all of the modules except emulation logic are in their default configurations, and
hardware begins the boot process.
NOTE: Max reset may be blocked by an emulator command. This allows an emulator to block a
watchdog timer-initiated Max reset for debug purposes.
See the TMS320DM646x DMSoC 64-Bit Timer User's Guide (SPRUER5) for information on the watchdog
timer.
10.3.4 System Reset
The emulator initiates System reset via special DSP emulation or ICECrusher. System reset is considered
a soft reset (memory contents are maintained, clock logic and power control logic are not affected). None
of the following modules are reset: DDR2 Memory Controller, PLL Controller (PLLC), Power and Sleep
Controller (PSC), and emulation circuitry.
The following steps describe the System reset sequence:
1. The emulator initiates System reset.
2. The proper modules are reset.
3. The System reset finishes, the proper modules are reset, and the CPU is out of reset.
10.3.5 Module Reset
Module reset allows the software to independently reset a module. Module reset can be used to return a
module to its default state (that is, its state as seen after POR, Warm reset, and Max reset). Module reset
is intended as a debug tool; rather than for general use, because if care is not taken arbitrarily setting a
module can result in the switch fabric locking up.
The procedures for asserting and deasserting module reset are fully described in Chapter 6. Furthermore,
special considerations for DSP module reset are described in Chapter 12.
10.3.6 DSP Local Reset
You can use DSP local reset to reset the DSP CPU. When the DSP local reset is asserted, the DSP
internal memories (L1P, L1D, and L2) are still accessible. Unlike Module reset, local reset only resets the
DSP CPU. The ARM uses local reset to reset the DSP during the DSP boot process.
NOTE: Module reset supersedes local reset, so you can execute a module reset when local reset is
asserted or deasserted.
The procedures for asserting and deasserting DSP local reset are fully described in the Chapter 12 and
Chapter 6.
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10.3.7 Test and Emulation Reset (TRST pin)
This is the Test reset on JTAG interface. Drive the TRST pin low to keep the test and emulation logic in
reset. TRST needs to be released (pulled high) whenever it is necessary to use a JTAG controller to
debug the device. You can pull the TRST pin high on the board if emulation is required.
10.4 Default Device Configurations
After POR, Warm reset, and Max reset, the chip is in its default configuration. This section highlights the
default configurations associated with PLLs, clocks, ARM boot mode, EMIFA, and DSP boot mode.
NOTE: Default configuration is the configuration before the boot process begins. The boot ROM
updates the configuration. See Chapter 11 for more information on the boot process.
10.4.1 Device Configuration Pins
The device configuration pins are latched at the end of power-on reset or Warm reset.
The boot configuration register (BOOTCFG) in the System Module is a read-only register that indicates
the value of the device configuration pins latched at the end of reset. During a hard reset (POR or RESET
pin active [low]), the values of the device configuration pins (BTMODE[3:0], CS2BW, PCIEN, and
DSPBOOT) are propagated through BOOTCFG to the Boot Controller. When RESET or POR is
deasserted (raising edge), the value of the pins is latched. The BOOTCFG value does not change as a
result of a soft reset, instead the value latched at the end of the previous global reset is retained.
BOOTCFG is shown in Figure 10-1 and described in Table 10-3. See device-specific data manual for
details on BOOTCFG.
The device configuration pins allow you to configure the following options at reset:
• Boot Mode (BTMODE[3:0] pins)
• EMIFA EM_CS2 default bus width (CS2BW pin)
• PCI enable (PCIEN pin)
• DSP Boot Mode (DSPBOOT pin)
NOTE: The device configuration pins are multiplexed with pins of the video port interface (VPIF).
After the device configuration pins are latched at reset, they automatically change to function
as VPIF pins. Pin multiplexing is described in Chapter 9.
Figure 10-1. Boot Configuration Register (BOOTCFG)
31
18
15
17
16
Reserved
DSP_BT
PCIEN
R-0
R-L
R-L
9
8
7
4
3
0
Reserved
CS2_BW
Reserved
BOOTMODE
R-0
R-L
R-0
R-L
LEGEND: R = Read only; L = Latched pin value; -n = value after reset
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Table 10-3. Boot Configuration Register (BOOTCFG) Field Descriptions
Bit
Field
31-18 Reserved
17
16
Value Description
0
DSP_BT
Reserved
8
CS2_BW
7-4
Reserved
3-0
BOOTMODE
Reserved. Read returns 0.
DSP Boot. This bit causes the DSP to be released from reset automatically. The
C64x+ boots from EMIFA (default DSPBOOTADDR address 0x4220 0000). If
BOOTMODE = 2h or 3h,
or PCIEN = 1, then the C64x+ self-boot will fail since EMIFA will be disabled.
0
ARM boots C64x+ DSP.
1
C64x+ DSP self-boots.
PCIEN
15-9
Latched pin at
the rising edge
of RESET or
POR
PCI Enable.
DSPBOOT
PCIEN
0
PCI is disabled.
1
PCI is enabled. The internal pullup and pulldown resistors on the PCI pins are
disabled and configures the pin multiplexing for PCI.
0
Reserved. Read returns 0.
EMIFA EM_CS2 Default Bus Width. This bit determines the default bus width of the
EMIFA EM_CS2 memory space. This ensures that boot from EMIFA (ARM or DSP)
correctly reads the attached memory.
0
Default to 8-bit operation.
1
Default to 16-bit operation.
0
Reserved. Read returns 0.
0-Fh
Boot Mode Configuration.
CS2BW
BTMODE[3:0]
0
Emulation boot. (BOOT from ROM)
1h
Reserved
2h
HPI-16 (if PCIEN = 0). (BOOT from ROM)
PCI without autoinitialization (if PCIEN = 1). (BOOT from ROM)
3h
HPI-32 (if PCIEN = 0). (BOOT from ROM)
PCI with autoinitialization (if PCIEN = 1). (BOOT from ROM)
4h
EMIFA direct boot (ROM/NOR) (if PCIEN = 0; error if PCIEN = 1, defaults to UART0).
5h
Reserved
6h
I2C boot. (BOOT from ROM)
7h
NAND Flash boot (if PCIEN = 0; error if PCIEN = 1).
8h
UART0 boot. (BOOT from ROM)
9h
Reserved
Ah
VLYNQ boot. (BOOT from ROM)
Bh
Reserved
Ch-Dh Reserved
114
Eh
SPI boot. (BOOT from ROM)
Fh
Reserved
Reset
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10.4.2 PLL and Clock Configuration
After POR, Warm reset, and Max reset, the PLLs and clocks are set to their default configurations.
The PLLs are in bypass mode and disabled by default. This means that the input reference clock at
DEV_MXI drives the chip after reset. For more information, see Chapter 5 and the device-specific data
manual. The default state of the PLLs is reflected by the default state of the register bits in the PLLC
registers.
Only a subset of module clocks are enabled after reset by default. Table 6-1 shows which modules are
enabled after reset. As shown in Table 6-1, the following modules are enabled by default: ARM, Timer2
(watchdog timer), System Module, and ARM interrupt controller. Some modules are enabled by default
depending on the sampled state of the device configuration pins. For example, EMIFA is enabled after
reset when the device configuration pins (BTMODE[3:0] = 0100, EMIFA direct boot and PCIEN = 0) select
EMIFA boot mode.
10.4.3 ARM Boot Mode Configuration
The device configuration pins (BTMODE[3:0]) determine whether the ARM boots from its ROM or from the
asynchronous EMIF (EMIFA).
When ROM boot is selected (BTMODE[3:0] != 0100), a jump to the internal TCM ROM (0000 8000h) is
forced into the first fetched instruction word. The embedded ROM boot loader (RBL) code then performs
certain configuration steps, reads the boot configuration register (BOOTCFG) in the System Module to
determine the desired boot method, and branches to an appropriate secondary loader utility.
If EMIFA boot is selected (BTMODE[3:0] = 0100), a jump to the highest branch address (0200 0000h) is
forced into the first fetched instruction word. ARM Instruction Address Modification logic inserts a 1 on bit
30 of the address bus to modify the access to address 4200 0000h, which is the start of the EMIFA CS2
memory region. The ARM then continues executing from external memory using the default EMIFA
timings until modified by software. Code within the EMIFA memory should execute a branch to the actual
EMIFA address, and then disable the Instruction Address Modification logic by clearing the ADDRMOD bit
in the ARM boot configuration register (ARMBOOT) in the System Module.
NOTE:
Either NOR Flash or ROM must be connected to the first EMIFA chip select space
(EM_CS2). The EMIFA does not support direct execution from NAND Flash.
The ARM boot configuration register (ARMBOOT) is used to control the ARM926 boot. The ARMBOOT
value does not change as a result of a global soft reset, instead the last value written is retained.
ARMBOOT is shown in Figure 10-2 and described in Table 10-4. See device-specific data manual for
details on ARMBOOT.
Figure 10-2. ARM Boot Configuration Register (ARMBOOT)
31
16
Reserved
R-0
15
5
4
3
1
0
Reserved
ADDRMOD
Reserved
TRAMBOOT
R-0
R/W-C
R-0
R/W-0
LEGEND: R/W = Read/Write; R = Read only; C = Clear; -n = value after reset
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Table 10-4. ARM Boot Configuration Register (ARMBOOT) Field Descriptions
Bit
31-5
4
3-1
0
Field
Reserved
Value
0
ADDRMOD
Reserved
Description
Reserved. Read returns 0.
IAHB Address Modification. The default value for this bit is determined by the BOOTMODE
configuration bits (BTMODE[3:0]). If BTMODE[3:0] = 0100 [EMIFA direct boot (ROM/NOR)] , then
ADDRMOD defaults to 1 so that instruction fetches from the ARM point to EMIFA CS2 memory
space. For all other BTMODE[3:0] values, ADDRMOD defaults to 0 so the ARM boots from its TCM
(ROM or RAM).
0
No address modification.
1
Address bit 30 is tied high to modify IAHB fetch address to point to EMIFA.
0
Reserved. Read returns 0.
TRAMBOOT
ARM TCM RAM Boot. This is a "sticky" bit that can be used to force the ARM926 to boot from
ITCM RAM. On POR reset, this bit is initialized to 0 because TCM RAM is not initialized; otherwise,
the bit retains the value. After initializing ITCM RAM, software can set this bit so that subsequent
Warm reset (RESET) or soft reset boots from the ITCM.
0
Use BTMODE[3:0] selected boot mode
1
Boot from ITCM RAM
10.4.4 EMIFA Configuration
10.4.4.1 EMIFA CS2 Bus Width Configuration
The CS2BW pin determines the default width of the first EMIFA chip select space (EM_CS2):
• if CS2BW = 0, the space defaults to 8-bits wide
• if CS2BW = 1, the space defaults to 16-bits wide
This allows the ARM to make full use of the width of the attached memory device, if booting from EMIFA
or NAND.
NOTE: CS2BW only selects the default width and needs to be set depending on whether 8-bit or
16-bit EMIFA memory or NAND is used at boot time. After boot, the width of CS2BW can be
changed by software by accessing the appropriate EMIFA control register.
The CS2BW input affects only the first EMIFA chip select space (EM_CS2). All other chip select spaces
default to 8-bits wide and must be modified using the appropriate EMIFA control register if 16-bit operation
is desired.
See the TMS320DM646x DMSoC Asynchronous External Memory Interface (EMIF) User's Guide
(SPRUEQ7) for more information on the EMIF.
10.4.4.2 EMIFA Timing Configuration
When EMIFA is enabled, the wait state registers are reset to the slowest possible configuration, which is
88 cycles per access (16 cycles of setup, 64 cycles of strobe, and 8 cycles of hold). Thus, with a 27-MHz
clock at MXI, the EMIFA is configured to run at 4.5 MHz/88, which equals approximately 51 kHz by
default. See the TMS320DM646x DMSoC Asynchronous External Memory Interface (EMIF) User's Guide
(SPRUEQ7) for more information on the EMIF.
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10.4.5 PCI Enable (PCIEN) Operation
The PCIEN is latched into the boot configuration register (BOOTCFG) in the System Module from the
PCIEN configuration pin at the end of reset (that is, rising edge of RESET or POR).
The PCIEN configuration signal is used to select the default configuration of the HPI/PCI/EMIFA pins at
reset. This allows the DM646x DMSoC to be PCI-compliant at reset when integrated into a PCI system.
When PCIEN = 1, the PCI module disables the internal pullup and pulldown resistors on the PCI pins and
configures pin multiplexing for PCI. PCIEN is also used in bootmode selection to differentiate between HPI
(PCIEN = 0) and PCI (PCIEN = 1) modes. The PCIEN input must be 0 when the EMIFA boot is selected
but need not be 0 for other boot modes. This allows the device to be part of a PCI system even if booted
from UART, SPI, etc.
See the device-specific data manual for PCIEN pin multiplexing details in the pin multiplexing control 0
register (PINMUX0).
10.4.6 DSP Boot Mode (DSP_BT) Configuration
The DSP_BT input determines the DSP operation at reset. For most applications, the ARM is the master
device and controls the reset and boot of the DSP. Under this scenario (DSP_BT = 0), the C64x+ DSP
remains disabled (held in reset) after reset. The ARM is responsible for releasing the DSP from reset.
Before releasing the DSP from reset, the ARM must transfer a valid DSP boot image to program memory
accessible by the DSP (DSP memory, EMIFA or DDR2), and configure the DSP boot address in the DSP
boot address register (DSPBOOTADDR) in the System Module from which the C64x+ DSP begins
execution.
When DSP_BT = 1, the C64x+ DSP boots itself. Under this scenario, the C64x+ DSP is released from
reset without ARM intervention. The DSP boot address is set to an EMIFA address (4220 0000h). The
C64x+ DSP begins execution with instruction (L1P) cache enabled.
NOTE: The DSP_BT operation is overridden when ARM HPI or PCI boot is selected
(BOOTMODE[3:0] = 001x). This is because the ARM HPI/PCI boot selection forces the
HPIEN or PCIEN bit in the pin multiplexing control 0 register (PINMUX0) to 1. This enables
HPI/PCI functions on the EMIFA control and data pins and prevents the DSP from using the
EMIFA. DSP_BT is treated as 0 internally when BTMODE[3:0] = 001x, regardless of the
value at the configuration pin (the actual pin value should still be latched in the boot
configuration register (BOOTCFG) in the System Module).
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Chapter 11
SPRUEP9E – August 2010
Boot Modes
The TMS320DM646x DMSoC ARM can boot either from asynchronous EMIF/NOR Flash or from ARM
ROM, as determined by the device configuration pins (BTMODE[3:0], CS2_BW, PCIEN, and DSP_BT) at
reset. The PCIEN pin configuration is used to select the default configuration of the EMIFA/PCI/HPI pins
at reset. This allows the DM646x DMSoC to be PCI-compliant at reset. PCIEN = 1 disables the internal
pullup and pulldown resistors on the PCI pins and configures the pin muxing for PCI. For all other
bootmodes (non-PCI bootmode), the PCIEN must be cleared to 0.
For a more detailed description of the ROM boot modes supported by the DM646x DMSoC, see Using the
TMS320DM646x DMSoC Bootloader Application Report (SPRAAS0).
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Chapter 12
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ARM-DSP Integration
Topic
12.1
12.2
12.3
12.4
12.5
...........................................................................................................................
Introduction ....................................................................................................
Shared Peripherals ..........................................................................................
Shared Memory ...............................................................................................
ARM-DSP Interrupts .........................................................................................
ARM Control of DSP Boot, Clock, and Reset .......................................................
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122
122
124
125
126
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12.1 Introduction
The TMS320DM646x DMSoC integrates an ARM core for overall system control functions and a DSP
subsystem for complex data and image/video processing functions. Figure 12-1 shows the
interconnections between the ARM and the DSP cores and the shared resources. Both the ARM and the
DSP have access to the EDMA, McASP, Timer0, and Timer1 peripherals. Both the ARM and DSP have
access to several blocks of shared memory, including ARM internal memory, DSP internal memory, and
external memory of the DDR2 memory controller and asynchronous EMIF (EMIF). The system control
module includes registers that allow the ARM to interrupt the DSP and conversely allow the DSP to
interrupt the ARM. The power and sleep controller (PSC) and the system control module (SYS) provide
the ARM with a set of registers to boot the DSP, enable/disable the DSP clock, and reset the DSP.
In summary, ARM-DSP integration includes all of the following features:
• Shared peripherals
– ARM and DSP have access to EDMA
– ARM and DSP have access to McASP
– ARM and DSP have access to Timer0 and Timer1
• Shared memory
– ARM has access to DSP internal memory (L1P, L1D, L2)
– DSP has access to ARM internal memory
– ARM and DSP have access to DDR2 memory controller and asynchronous EMIF
• ARM-DSP interrupts
– ARM can interrupt the DSP (via 4 general interrupts and 1 NMI)
– DSP can interrupt the ARM (via 1 general interrupt)
• ARM control of DSP clock, reset, and boot
– ARM can boot the DSP
– ARM can control the DSP
– Clock on/off
– ARM can assert/deassert DSP module and local resets
These features are described in the following sections.
12.2 Shared Peripherals
The following peripherals are fully accessible by both the ARM and the DSP.
• EDMA
• McASP
• Timer0 and Timer1
Both the ARM and the DSP access these peripherals through the configuration bus. See Chapter 4 for
information on the configuration bus.
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Figure 12-1. ARM-DSP Integration
Shared
memory
ARM
memory
Data
Data
DSP
memory
DDR2/
EMIF
ARM
EDMA
CFG
DSP
CFG
McASP
Timer0/
Timer1
ARM DSP2ARM INT
INTC
PSC
System Boot address
control Chip shorting
module
ARM2DSP INT
DSP
INTC
Clock on/off and reset
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Shared Memory
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12.3 Shared Memory
The DM646x DMSoC memory-map is described in detail in Chapter 4. As noted in Chapter 4, ARM, DSP,
and EDMA all have access to ARM internal memory, DSP internal memory, and external memory of the
DDR2 memory controller and EMIFA. The EDMA can transfer data among shared memory without ARM
or DSP intervention. See the TMS320DM646x DMSoC Enhanced Direct Memory Access (EDMA)
Controller User's Guide (SPRUEQ5) for more information on the EDMA.
12.3.1 ARM Internal Memories
The ARM, DSP, and EDMA can access the ARM’s internal memories:
• 32 KB ARM internal RAM
• 8 KB ARM internal ROM
12.3.2 DSP Memories
The ARM, DSP, and EDMA can access the DSP’s internal memories:
• L1P RAM (32 KB)
• L1D RAM (32 KB)
• L2 RAM (128 KB)
This feature allows the ARM and EDMA to load DSP memories with program instructions and data.
NOTE: Portions of the above DSP memories are configurable as DSP cache memory. When
configured as cache, neither the ARM nor the EDMA can access the cache portions. For
more information on the DSP internal memories and cache configuration, see the
TMS320DM646x DMSoC DSP Subsystem Reference Guide (SPRUEP8).
12.3.3 External Memories
Both the ARM and the DSP have access to devices connected to the DDR2 memory controller and the
EMIFA. This allows the ARM and DSP to access program and data from DDR on the DDR2 memory
controller and from devices attached to the EMIFA, such as NOR flash or SRAM.
NOTE: The DSP can access the data space of the DDR2 memory controller and of the EMIFA.
However, the DSP cannot access the control register space of these EMIFs. Therefore, it is
the ARM's responsibility to configure the control registers of the DDR2 memory controller
and the EMIFA.
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12.4 ARM-DSP Interrupts
The ARM can interrupt the DSP; conversely, the DSP can interrupt the ARM. These interrupts are
generally used to allow the ARM and the DSP to coordinate. For example, the ARM may interrupt the
DSP when it is ready to have the DSP process some data buffer in shared memory. A typical sequence is
as follows:
• ARM writes command in shared memory
• ARM interrupts DSP
• DSP responds to interrupt and reads command in shared memory
• DSP executes a task based on the command
• DSP interrupts ARM upon completion of the task
This sequence is often referred to as ARM-DSP communication.
The ARM has access to five DSP interrupt events, ARM2DSP0, ARM2DSP1, ARM2DSP2, ARM2DSP3,
and NMI, in the DSP interrupt event map. The DSP has access to one ARM interrupt event, DSP2ARM0,
in the ARM interrupt event map. The ARM-DSP interrupts/events are summarized in Table 12-1.
Table 12-1. ARM-DSP Interrupt Mapping
Source
Name
Description
DSP2ARM0
ARM2DSP0
Interrupt Number
ARM
DSP
AINTC
INTC
DSP Controller to ARM Interrupt
-
x
45
-
ARM to DSP Controller 0 Interrupt
x
-
-
16
ARM2DSP1
ARM to DSP Controller 1 Interrupt
x
-
-
17
ARM2DSP2
ARM to DSP Controller 2 Interrupt
x
-
-
18
ARM2DSP3
ARM to DSP Controller 3 Interrupt
x
-
-
19
NMI
Nonmaskable Interrupt
x
-
-
-
The System Module includes registers for generating interrupts from the ARM to the DSP (DSPINT,
DSPINTSET, and DSPINTCLR) and from the DSP to the ARM (DSPINT, DSPINTSET, and DSPINTCLR).
See the device-specific data manual for details on these registers.
The ARM uses DSPINT, DSPINTSET, and DSPINTCLR to generate an interrupt to the DSP. The DSP
interrupt status register (DSPINT) shows the status of the ARM-to-DSP interrupts. The ARM may generate
an interrupt to the DSP by setting one of the four INTDSPn bits or the INTNMI bit in the DSP interrupt set
register (DSPINTSET). The interrupt set (INTDSPn) bit then self-clears and the corresponding bit in
DSPINT is automatically set to indicate that the interrupt was generated. After servicing the interrupt, the
DSP clears the status bit in DSPINT by writing a 1 to the corresponding bit in the DSP interrupt clear
register (DSPINTCLR). The ARM may poll the status bit in DSPINT to determine when the DSP has
completed the interrupt service.
The DSP may generate an interrupt to the ARM in a similar manner using the ARM interrupt set register
(ARMINTSET) and the ARM interrupt clear register (ARMINTCLR). The DSP can monitor the status of the
DSP-to-ARM interrupts using the ARM interrupt status register (ARMINT).
For more information on ARM interrupts, see Chapter 8. For more information on DSP interrupts, see the
DSP interrupts section of the TMS320DM646x DMSoC DSP Subsystem Reference Guide (SPRUEP8).
For more information on the system control module, see Chapter 9.
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12.5 ARM Control of DSP Boot, Clock, and Reset
As
•
•
•
system master, the ARM can control all of the following functions:
Boot the DSP
Turn the clock on/off
Reset the DSP
To initiate these operations, firmware on the ARM must coordinate with the DSP and use the power and
sleep controller (PSC) module. This section provides specific details on how to initiate these operations.
For more information on the PSC and system control module, see Chapter 6 and Chapter 9.
NOTE: The DM646x DMSoC has only one power domain (Always On); therefore, the ARM has no
control of the DSP power on/off.
12.5.1 DSP Boot
The DSP can boot in either of two modes: ARM boots DSP mode or DSP self-boot mode.
• In the ARM boots DSP mode, the ARM is responsible for managing the DSP boot after power-on/reset.
• In the DSP self-boot mode, the DSP boots without ARM intervention immediately upon power-on/reset.
The boot mode is determined by sampling the DSP boot source (DSPBOOT) pin at power-on/reset
(Table 12-2). See Chapter 10 and Chapter 11 for more information on boot and reset modes. This section
describes the procedure to boot the DSP with the ARM, when in ARM boots DSP mode.
Table 12-2. DSP Boot Configuration
Device Configuration
Function
Sampled Pin
Default Setting
DSP boot
0 = ARM boots DSP
DSPBOOT
ARM boots DSP
1 = DSP self-boots
To boot the DSP, the ARM must specify a boot address in the DSP boot address register
(DSPBOOTADDR) in the System Module and ensure that the DSP program code is loaded properly into
memory. When the ARM releases the DSP from reset, the DSP immediately begins code execution from
the boot address programmed in DSPBOOTADDR. To boot the DSP:
1. Put the DSP module in the enable state. Prior to beginning the DSP boot sequence, the DSP module
must be in the enable state. See Section 12.5.2 for information on how to execute DSP module clock
on.
2. Clear the LRST bit in the module control 1 register (MDCTL1) in the PSC to 0. This asserts the DSP
local reset. By default, after power-on reset or hard reset, the value of the LRST bit in MDCTL1 is
cleared to 0.
3. Set the DSP boot address in DSPBOOTADDR. By default, after power-on or hard reset, the value in
DSPBOOTADDR is 4220 0000h, which maps to the EMIFA. The ARM software can specify a boot
address that maps to L1P internal DSP memory, EMIFA, or DDR2 memory controller. The DSP can
execute program instructions from any of these memories.
4. Ensure that the DSP program code is loaded/stored with a reset vector at the DSP boot address
specified in the previous step.
5. Set the LRST bit in MDCTL1 to 1. This deasserts the DSP local reset. After reset is deasserted, the
DSP immediately begins code execution from the boot address programmed in DSPBOOTADDR.
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12.5.2 DSP Module Clock ON/OFF
12.5.2.1 DSP Module Clock On (Enable)
In the clock enable state, the DSP’s module clock is enabled while the DSP module reset is deasserted.
This is the state for normal DSP run-time.
• ARM: Enable clocks to the DSP:
1. Wait for the GOSTAT[0] bit in the power domain transition status register (PTSTAT) in the PSC to
clear to 0. You must wait for the power domain to finish any previously initiated transitions before
initiating a new transition.
2. Set the NEXT bit in the module control 1 register (MDCTL1) in the PSC to 3h to prepare the DSP
module for an enable transition.
3. Set the GO[0] bit in the power domain transition command register (PTCMD) in the PSC to 1 to
initiate the state transition.
4. Wait for the GOSTAT[0] bit in PTSTAT to clear to 0. The domain is only safely in the new state
after the GOSTAT[0] bit is cleared to 0.
5. Wait for the STATE bit in the module status 1 register (MDSTAT1) in the PSC to change to 3h. The
module is only safely in the new state after the STATE bit in MDSTAT1 changes to reflect the new
state.
6. Clocks are enabled to the DSP.
• ARM: Wake the DSP. If transitioning from the disable or idle state, trigger a DSP interrupt that has
previously been configured as a wake-up interrupt, (for example, set the INTDSPn or INTNMI bit in the
DSP interrupt set register (DSPINTSET) in the System Module.
NOTE: This step only applies if you are transitioning from the disable state. If previously in the
disable state, a wake-up interrupt must be triggered in order to wake the DSP. This example
assumes that the DSP enabled this interrupt before entering its IDLE state. If previously in
the software reset disable or synchronous reset state, it is not necessary to wake the DSP
because these states assert the DSP module reset. See Chapter 10 for information on the
software reset disable and synchronous reset states. See the TMS320C64x+ DSP
Megamodule Reference Guide (SPRU871) for more information on DSP interrupts.
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12.5.2.2 DSP Module Clock Off (Disable)
In the clock disable state, the DSP’s module clock is disabled while the DSP module reset remains
deasserted. This state is typically used to disable the DSP clock to save power.
• ARM: Notify the DSP to prepare for power-down.
• DSP: Prepare for power-down:
1. Set the power-down command register (PDCCMD) in the DSP power-down controller (PDC)
module to 0001 5555h
NOTE: PDCCMD can only be written while the DSP is in supervisor mode. See the
TMS320DM646x DMSoC DSP Subsystem Reference Guide (SPRUEP8) and the
TMS320C64x+ DSP Megamodule Reference Guide (SPRU871) for more information on
the power-down controller (PDC).
•
2. Enable one of the interrupts: ARM2DSP0, ARM2DSP1, ARM2DSP2, ARM2DSP3, or NMI. This
interrupt wakes the DSP in the DSP clock-on sequence.
3. Execute the IDLE instruction. IDLE is a program instruction in the C64x+ CPU instruction set. When
the CPU executes IDLE, the PDC is notified and initiates DSP power-down according to the bits set
in PDCCMD. See the TMS320C64x+ DSP Megamodule Reference Guide (SPRU871) for more
information on the PDC and the IDLE instruction.
ARM: Disable the DSP clock:
1. Wait for the GOSTAT[0] bit in the power domain transition status register (PTSTAT) in the PSC to
clear to 0. You must wait for the power domain to finish any previously initiated transitions before
initiating a new transition.
2. Set the NEXT bit in the module control 1 register (MDCTL1) in the PSC to 2h to prepare the DSP
module for a disable transition.
3. Set the GO[0] bit in the power domain transition command register (PTCMD) in the PSC to 1 to
initiate the state transition.
4. Wait for the GOSTAT[0] bit in PTSTAT to clear to 0. The domain is only safely in the new state
after the GOSTAT[0] bit is cleared to 0.
5. Wait for the STATE bit in the module status 1 register (MDSTAT1) in the PSC to change to 2h. The
module is only safely in the new state after the STATE bit in MDSTAT1 changes to reflect the new
state.
6. Clocks to the DSP are disabled.
12.5.3 DSP Reset
With access to the PSC registers, the ARM can assert and deassert DSP local reset and DSP module
reset. When DSP local reset is asserted, the DSP’s internal memories (L1P, L1D, and L2) are still
accessible. Local reset only resets the DSP CPU. Local reset is useful when the DSP module is in the
enable or disable states, since module reset is asserted in the SyncReset and SwRstDisable states and
module reset supersedes local reset. The intent of local reset is for the ARM to use local reset to reset the
DSP during the DSP boot process. The intent of module reset is for it to completely reset the DSP (like
hard reset). For more information on the PSC, see Chapter 6. For more information on local reset and on
module reset, see Chapter 10. This section describes how to initiate DSP local reset and module reset.
12.5.3.1 DSP Local Reset
To assert/deassert local reset:
1. Clear the LRST bit in the module control 1 register (MDCTL1) in the PSC to 0 to assert DSP reset.
2. Set the LRST bit in MDCTL1 to 1 to deassert DSP reset.
128
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SPRUEP9E – August 2010
Copyright © 2010, Texas Instruments Incorporated
ARM Control of DSP Boot, Clock, and Reset
www.ti.com
12.5.3.2 DSP Module Reset
12.5.3.2.1 Software Reset Disable (SwRstDisable)
In the software reset disable (SwRstDisable) state, the DSP’s module reset is asserted and its module
clock is turned off. You can use this state to reset the DSP. The following steps describe how to put the
DSP in the software reset disable state:
• ARM: Notify the DSP to prepare for power-down.
• DSP: Put the DSP in the IDLE state:
1. Set the power-down command register (PDCCMD) in the DSP power-down controller (PDC)
module to 0001 5555h.
NOTE: PDCCMD can only be written while the DSP is in supervisor mode. See the
TMS320DM646x DMSoC DSP Subsystem Reference Guide (SPRUEP8) and the
TMS320C64x+ DSP Megamodule Reference Guide (SPRU871) for more information on
the power-down controller (PDC).
•
•
2. Execute the IDLE instruction if the DSP is in the enable state. IDLE is a program instruction in the
C64x+ CPU instruction set. When the CPU executes IDLE, the PDC is notified and initiates DSP
power-down according to the bits set in PDCCMD. See the TMS320C64x+ DSP Megamodule
Reference Guide (SPRU871) for more information on the PDC and the IDLE instruction.
ARM: Software reset disable DSP:
1. Wait for the GOSTAT[0] bit in the power domain transition status register (PTSTAT) in the PSC to
clear to 0. You must wait for the power domain to finish any previously initiated transitions before
initiating a new transition.
2. Clear the NEXT bit in the module control 1 register (MDCTL1) in the PSC to 0 to prepare the DSP
module for a software reset disable transition.
3. Set the GO[0] bit in the power domain transition command register (PTCMD) in the PSC to 1 to
initiate the state transition.
4. Wait for GOSTAT[0] bit in PTSTAT to clear to 0. The domain is safely in the new state only after
the GOSTAT[0] bit is cleared to 0.
5. Wait for the STATE bit in the module status 1 register (MDSTAT1) in the PSC to change to 0. The
module is safely in the new state only after the STATE bit in MDSTAT1 changes to reflect the new
state.
ARM: Assert the DSP local reset. Clear the LRST bit in the module control 1 register (MDCTL1) in the
PSC to 0. This step is optional. This step asserts the DSP local reset and is included here so that the
DSP does not start running immediately upon power-on/enable. Typically, software deasserts local
reset sometime after finishing the enable sequence.
SPRUEP9E – August 2010
ARM-DSP Integration
Copyright © 2010, Texas Instruments Incorporated
129
ARM Control of DSP Boot, Clock, and Reset
www.ti.com
12.5.3.2.2 Synchronous Reset (SyncReset)
In the synchronous reset (SyncReset) state, the DSP’s module reset is asserted and its module clock is
enabled. You can use this state to reset the DSP. The following steps describe how to put the DSP in the
synchronous reset state:
• ARM: Notify the DSP to prepare for power-down.
• DSP: Put the DSP in the IDLE state:
1. Set the power-down command register (PDCCMD) in the DSP power-down controller (PDC)
module to 0001 5555h.
NOTE: PDCCMD can only be written while the DSP is in supervisor mode. See the
TMS320DM646x DMSoC DSP Subsystem Reference Guide (SPRUEP8) and the
TMS320C64x+ DSP Megamodule Reference Guide (SPRU871) for more information on
the power-down controller (PDC).
•
•
130
2. Execute the IDLE instruction if the DSP is in the enable state. IDLE is a program instruction in the
C64x+ CPU instruction set. When the CPU executes IDLE, the PDC is notified and initiates DSP
power-down according to the bits set in PDCCMD. See the TMS320C64x+ DSP Megamodule
Reference Guide (SPRU871) for more information on the PDC and the IDLE instruction.
ARM: Sync reset DSP:
1. Wait for the GOSTAT[0] bit in the power domain transition status register (PTSTAT) in the PSC to
clear to 0. You must wait for the power domain to finish any previously initiated transitions before
initiating a new transition.
2. Set the NEXT bit in the module control 1 register (MDCTL1) in the PSC to 1 to prepare the DSP
module for a sync reset transition.
3. Set the GO[0] bit in the power domain transition command register (PTCMD) in the PSC to 1 to
initiate the state transition.
4. Wait for GOSTAT[0] bit in PTSTAT to clear to 0. The domain is safely in the new state only after
the GOSTAT[0] bit is cleared to 0.
5. Wait for the STATE bit in the module status 1 register (MDSTAT1) in the PSC to change to 1. The
module is safely in the new state only after the STATE bit in MDSTAT1 changes to reflect the new
state.
ARM: Assert DSP local reset. Clear the LRST bit in the module control 1 register (MDCTL1) in the
PSC to 0. This step is optional. This step asserts the DSP local reset and is included here so that the
DSP does not start running immediately upon power-on/enable. Typically, software deasserts local
reset sometime after finishing the enable sequence.
ARM-DSP Integration
SPRUEP9E – August 2010
Copyright © 2010, Texas Instruments Incorporated
Appendix A
SPRUEP9E – August 2010
Revision History
Table A-1 lists the changes made since the previous version of this document.
Table A-1. Document Revision History
Reference
Additions/Modifications/Deletions
Table 5-8
Changed Value range for PLLM bit.
SPRUEP9E – August 2010
Revision History
Copyright © 2010, Texas Instruments Incorporated
131
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