Compatible Systems | RISC 2800i | MPC7447A RISC Microprocessor Hardware Specifications

Freescale Semiconductor
MPC7447AEC
Rev. 5, 01/2006
Technical Data
MPC7447A
RISC Microprocessor
Hardware Specifications
This document is primarily concerned with the PowerPC™
MPC7447A; however, unless otherwise noted, all
information here also applies to the MPC7447. The
MPC7447A is an implementation of the PowerPC
microprocessor family of reduced instruction set computer
(RISC) microprocessors. This document describes pertinent
electrical and physical characteristics of the MPC7447A. For
functional characteristics of the processor, refer to the
MPC7450 RISC Microprocessor Family Reference Manual.
To locate any published updates for this document, refer to
the Freescale website located at
http://www.freescale.com.
1
Overview
The MPC7447A is the fifth implementation of the
fourth-generation (G4) microprocessors from Freescale. The
MPC7447A implements the full PowerPC 32-bit
architecture and is targeted at networking and computing
systems applications. The MPC7447A consists of a
processor core and a 512-Kbyte L2.
Figure 1 shows a block diagram of the MPC7447A. The core
is a high-performance superscalar design supporting a
double-precision floating-point unit and a SIMD multimedia
unit. The memory storage subsystem supports the MPX bus
protocol and a subset of the 60x bus protocol to main
memory and other system resources.
© Freescale Semiconductor, Inc., 2006. All rights reserved.
Contents
1. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
2. Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. Comparison with the MPC7447, MPC7445, and
MPC7441 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4. General Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
5. Electrical and Thermal Characteristics . . . . . . . . . . . . 9
6. Pin Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
7. Pinout Listings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
8. Package Description . . . . . . . . . . . . . . . . . . . . . . . . . 27
9. System Design Information . . . . . . . . . . . . . . . . . . . 34
10. Document Revision History . . . . . . . . . . . . . . . . . . . 52
11. Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . 52
2
Vector
Integer
Unit 2
L1 Service
Queues
Vector
Integer
Unit 1
+++
x÷
32-Bit
Integer
Integer
Integer
Unit
122
Unit
Unit
(3)
Integer
Unit 2
32-Bit
Reservation
Reservation
Reservation
Station
Station
Station
L2 Store Queue (L2SQ)
Snoop Push/
Interventions
L1 Castouts
(4)
Line Block 0 (32-Byte)
Block 1 (32-Byte)
Tags Status
Status
32-Bit
16 Rename
Buffers
GPR File
Vector
Touch
Queue
FPR Issue
(2-Entry/1-Issue)
512-Kbyte Unified L2 Cache Controller
128-Bit
Dispatch
Unit
Instruction Queue
(12-Word)
Notes: The Castout Queue and Push Queue share resources such that they have a combined total of 6 entries.
The Castout Queue itself is limited to 9 entries, ensuring 1 entry will be available for a push.
Cacheable Store Miss (1)
128-Bit
Vector
FPU
L2 Prefetch (3)
Instruction Fetch (2)
L1 Load Miss (5)
L1 Load Queue (LLQ)
L1 Store Queue
(LSQ)
Memory Subsystem
Vector
Permute
Unit
16 Rename
Buffers
VR File
Reservation
Stations (2)
LR
BHT (2048-Entry)
VR Issue
(4-Entry/2-Issue)
CTR
BTIC (128-Entry)
Fetcher
GPR Issue
(6-Entry/3-Issue)
Instruction Unit
Branch Processing Unit
Reservation Reservation Reservation Reservation
Station
Station
Station
Station
Completes up
to three
instructions
per clock
Completion Unit 96-Bit (3 Instructions)
Completion Queue
(16-Entry)
• Time Base Counter/Decrementer
• Clock Multiplier
• JTAG/COP Interface
• Thermal/Power Management
• Performance Monitor
• Dynamic Frequency Switching (DFS)
• Temperature Diode
Additional Features
128-Entry
ITLB
Completed
Stores
L1 Push
Finished
Stores
FPR File
Tags
64-Bit
FPSCR
+ x÷
FloatingPoint Unit
Reservation
Stations (2)
36-Bit
Address Bus
64-Bit
Data Bus
Bus Accumulator
Bus Store Queue
Castout
Queue (5) /
Push
Queue (6)1
System Bus Interface
64-Bit
32-Kbyte
I Cache
32-Kbyte
D Cache
Tags
128-Bit (4 Instructions)
16 Rename
Buffers
PA
Load
Queue (11)
Load Miss
L1 Castout
+ (EA Calculation)
Vector Touch Engine
Load/Store Unit
Reservation
Stations (2-Entry)
EA
128-Entry
DTLB
DBAT Array
SRs
(Original)
Data MMU
IBAT Array
SRs
(Shadow)
Instruction MMU
Overview
Figure 1. MPC7447A Block Diagram
MPC7447A RISC Microprocessor Hardware Specifications, Rev. 5
Freescale Semiconductor
Features
NOTE
The MPC7447A is a footprint-compatible, drop-in replacement in an
MPC7447 application if the core power supply is 1.3 V.
2
Features
This section summarizes features of the MPC7447A implementation of the PowerPC architecture.
Major features of the MPC7447A are as follows:
• High-performance, superscalar microprocessor
— Up to four instructions can be fetched from the instruction cache at a time.
— Up to 12 instructions can be in the instruction queue (IQ).
— Up to 16 instructions can be at some stage of execution simultaneously.
— Single-cycle execution for most instructions
— One instruction per clock cycle throughput for most instructions
— Seven-stage pipeline control
• Eleven independent execution units and three register files
— Branch processing unit (BPU) features static and dynamic branch prediction
– 128-entry (32-set, four-way set-associative) branch target instruction cache (BTIC), a cache
of branch instructions that have been encountered in branch/loop code sequences. If a target
instruction is in the BTIC, it is fetched into the instruction queue a cycle sooner than it can
be made available from the instruction cache. Typically, a fetch that hits the BTIC provides
the first four instructions in the target stream.
– 2048-entry branch history table (BHT) with 2 bits per entry for four levels of
prediction—not taken, strongly not taken, taken, and strongly taken
– Up to three outstanding speculative branches
– Branch instructions that do not update the count register (CTR) or link register (LR) are
often removed from the instruction stream.
– Eight-entry link register stack to predict the target address of Branch Conditional to Link
Register (bclr) instructions
— Four integer units (IUs) that share 32 GPRs for integer operands
– Three identical IUs (IU1a, IU1b, and IU1c) can execute all integer instructions except
multiply, divide, and move to/from special-purpose register instructions.
– IU2 executes miscellaneous instructions including the CR logical operations, integer
multiplication and division instructions, and move to/from special-purpose register
instructions.
— Five-stage FPU and a 32-entry FPR file
– Fully IEEE 754-1985–compliant FPU for both single- and double-precision operations
– Supports non-IEEE mode for time-critical operations
– Hardware support for denormalized numbers
– Thirty-two 64-bit FPRs for single- or double-precision operands
MPC7447A RISC Microprocessor Hardware Specifications, Rev. 5
Freescale Semiconductor
3
Features
•
•
•
•
— Four vector units and 32-entry vector register file (VRs)
– Vector permute unit (VPU)
– Vector integer unit 1 (VIU1) handles short-latency AltiVec™ integer instructions, such as
vector add instructions (for example, vaddsbs, vaddshs, and vaddsws).
– Vector integer unit 2 (VIU2) handles longer-latency AltiVec integer instructions, such as
vector multiply add instructions (for example, vmhaddshs, vmhraddshs, and
vmladduhm).
– Vector floating-point unit (VFPU)
— Three-stage load/store unit (LSU)
– Supports integer, floating-point, and vector instruction load/store traffic
– Four-entry vector touch queue (VTQ) supports all four architected AltiVec data stream
operations
– 3-cycle GPR and AltiVec load latency (byte, half word, word, vector) with 1-cycle
throughput
– 4-cycle FPR load latency (single, double) with 1-cycle throughput
– No additional delay for misaligned access within double-word boundary
– Dedicated adder calculates effective addresses (EAs)
– Supports store gathering
– Performs alignment, normalization, and precision conversion for floating-point data
– Executes cache control and TLB instructions
– Performs alignment, zero padding, and sign extension for integer data
– Supports hits under misses (multiple outstanding misses)
– Supports both big- and little-endian modes, including misaligned little-endian accesses
Three issue queues, FIQ, VIQ, and GIQ, can accept as many as one, two, and three instructions,
respectively, in a cycle. Instruction dispatch requires the following:
— Instructions can only be dispatched from the three lowest IQ entries—IQ0, IQ1, and IQ2.
— A maximum of three instructions can be dispatched to the issue queues per clock cycle.
— Space must be available in the CQ for an instruction to dispatch. (This includes instructions that
are assigned a space in the CQ but not in an issue queue.)
Rename buffers
— 16 GPR rename buffers
— 16 FPR rename buffers
— 16 VR rename buffers
Dispatch unit
— Decode/dispatch stage fully decodes each instruction
Completion unit
— The completion unit retires an instruction from the 16-entry completion queue (CQ) when all
instructions ahead of it have been completed, the instruction has finished execution, and no
exceptions are pending.
MPC7447A RISC Microprocessor Hardware Specifications, Rev. 5
4
Freescale Semiconductor
Features
•
•
•
— Guarantees sequential programming model (precise exception model)
— Monitors all dispatched instructions and retires them in order
— Tracks unresolved branches and flushes instructions after a mispredicted branch
— Retires as many as three instructions per clock cycle
Separate on-chip L1 instruction and data caches (Harvard architecture)
— 32-Kbyte, eight-way set-associative instruction and data caches
— Pseudo least-recently-used (PLRU) replacement algorithm
— 32-byte (eight-word) L1 cache block
— Physically indexed/physical tags
— Cache write-back or write-through operation programmable on a per-page or per-block basis
— Instruction cache can provide four instructions per clock cycle; data cache can provide four
words per clock cycle
— Caches can be disabled in software.
— Caches can be locked in software.
— MESI data cache coherency maintained in hardware
— Separate copy of data cache tags for efficient snooping
— Parity support on cache and tags
— No snooping of instruction cache except for icbi instruction
— Data cache supports AltiVec LRU and transient instructions
— Critical double- and/or quad-word forwarding is performed as needed. Critical quad-word
forwarding is used for AltiVec loads and instruction fetches. Other accesses use critical
double-word forwarding.
Level 2 (L2) cache interface
— On-chip, 512-Kbyte, eight-way set-associative unified instruction and data cache
— Fully pipelined to provide 32 bytes per clock cycle to the L1 caches
— A total 9-cycle load latency for an L1 data cache miss that hits in L2
— Cache write-back or write-through operation programmable on a per-page or per-block basis
— 64-byte, two-sectored line size
— Parity support on cache
Separate memory management units (MMUs) for instructions and data
— 52-bit virtual address, 32- or 36-bit physical address
— Address translation for 4-Kbyte pages, variable-sized blocks, and 256-Mbyte segments
— Memory programmable as write-back/write-through, caching-inhibited/caching-allowed, and
memory coherency enforced/memory coherency not enforced on a page or block basis
— Separate IBATs and DBATs (eight each) also defined as SPRs
— Separate instruction and data translation lookaside buffers (TLBs)
– Both TLBs are 128-entry, two-way set-associative, and use an LRU replacement algorithm.
MPC7447A RISC Microprocessor Hardware Specifications, Rev. 5
Freescale Semiconductor
5
Features
•
•
•
•
•
•
– TLBs are hardware- or software-reloadable (that is, a page table search is performed in
hardware or by system software on a TLB miss).
Efficient data flow
— Although the VR/LSU interface is 128 bits, the L1/L2 bus interface allows up to 256 bits.
— The L1 data cache is fully pipelined to provide 128 bits/cycle to or from the VRs.
— The L2 cache is fully pipelined to provide 256 bits per processor clock cycle to the L1 cache.
— As many as eight outstanding out-of-order cache misses are allowed between the L1 data cache
and the L2 bus.
— As many as 16 out-of-order transactions can be present on the MPX bus.
— Store merging for multiple store misses to the same line. Only coherency action taken
(address-only) for store misses merged to all 32 bytes of a cache block (no data tenure needed).
— Three-entry finished store queue and five-entry completed store queue between the LSU and
the L1 data cache
— Separate additional queues for efficient buffering of outbound data (such as castouts and
write-through stores) from the L1 data cache and L2 cache
Multiprocessing support features include the following:
— Hardware-enforced, MESI cache coherency protocols for data cache
— Load/store with reservation instruction pair for atomic memory references, semaphores, and
other multiprocessor operations
Power and thermal management
— A new dynamic frequency switching (DFS) feature allows processor core frequency to be
halved through software to reduce power consumption.
— The following three power-saving modes are available to the system:
– Nap—Instruction fetching is halted. Only the clocks for the time base, decrementer, and
JTAG logic remain running. The part goes into the doze state to snoop memory operations
on the bus and then back to nap using a QREQ/QACK processor-system handshake
protocol.
– Sleep—Power consumption is further reduced by disabling bus snooping, leaving only the
PLL in a locked and running state. All internal functional units are disabled.
– Deep sleep—When the part is in the sleep state, the system can disable the PLL. The system
can then disable the SYSCLK source for greater system power savings. Power-on reset
procedures for restarting and relocking the PLL must be followed upon exiting the deep
sleep state.
— Instruction cache throttling provides control of instruction fetching to limit device temperature.
— A new temperature diode can determine the temperature of the microprocessor.
— Support for core voltage derating to further reduce power consumption
Performance monitor can be used to help debug system designs and improve software efficiency.
In-system testability and debugging features through JTAG boundary-scan capability
Testability
— LSSD scan design
MPC7447A RISC Microprocessor Hardware Specifications, Rev. 5
6
Freescale Semiconductor
Comparison with the MPC7447, MPC7445, and MPC7441
•
3
— IEEE 1149.1 JTAG interface
— Array built-in self test (ABIST)—factory test only
Reliability and serviceability
— Parity checking on system bus
— Parity checking on the L1 and L2 caches
Comparison with the MPC7447, MPC7445, and
MPC7441
Table 1 compares the key features of the MPC7447A with the key features of the earlier MPC7447,
MPC7445, and MPC7441. All are based on the MPC7450 RISC microprocessor and are very similar
architecturally. The MPC7447A is identical to the MPC7447 but includes the DFS and temperature diode
features.
Table 1. Microarchitecture Comparison
Microarchitectural Specs
MPC7447A
MPC7447
MPC7445
MPC7441
Basic Pipeline Functions
Logic inversions per cycle
18
Pipeline stages up to execute
5
Total pipeline stages (minimum)
7
Pipeline maximum instruction throughput
3 + branch
Pipeline Resources
Instruction buffer size
12
Completion buffer size
16
Renames (integer, float, vector)
16, 16, 16
Maximum Execution Throughput
SFX
3
Vector
2 (any 2 of 4 units)
Scalar floating-point
1
Out-of-Order Window Size in Execution Queues
SFX integer units
1 entry × 3 queues
Vector units
In order, 4 queues
Scalar floating-point unit
In order
Branch Processing Resources
Prediction structures
BTIC size, associativity
BTIC, BHT, link stack
128-entry, 4-way
MPC7447A RISC Microprocessor Hardware Specifications, Rev. 5
Freescale Semiconductor
7
Comparison with the MPC7447, MPC7445, and MPC7441
Table 1. Microarchitecture Comparison (continued)
Microarchitectural Specs
MPC7447A
MPC7447
BHT size
MPC7445
MPC7441
2K-entry
Link stack depth
8
Unresolved branches supported
3
Branch taken penalty (BTIC hit)
1
Minimum misprediction penalty
6
Execution Unit Timings (Latency-Throughput)
Aligned load (integer, float, vector)
3-1, 4-1, 3-1
Misaligned load (integer, float, vector)
4-2, 5-2, 4-2
L1 miss, L2 hit latency
9 data/13 instruction
SFX (aDd Sub, Shift, Rot, Cmp, logicals)
1-1
Integer multiply (32 × 8, 32 × 16, 32 × 32)
3-1, 3-1, 4-2
Scalar float
5-1
VSFX (vector simple)
1-1
VCFX (vector complex)
4-1
VFPU (vector float)
4-1
VPER (vector permute)
2-1
MMUs
TLBs (instruction and data)
128-entry, 2-way
Tablewalk mechanism
Hardware + software
Instruction BATs/data BATs
8/8
8/8
8/8
4/4
L1 I Cache/D Cache Features
Size
32K/32K
Associativity
8-way
Locking granularity
Way
Parity on Instruction cache
Word
Parity on data cache
Byte
Number of data cache misses (load/store)
5/1
Data stream touch engines
4 streams
On-Chip Cache Features
Cache level
Size/associativity
Access width
L2
512-Kbyte/8-way
256-Kbyte/8-way
256 bits
MPC7447A RISC Microprocessor Hardware Specifications, Rev. 5
8
Freescale Semiconductor
General Parameters
Table 1. Microarchitecture Comparison (continued)
Microarchitectural Specs
MPC7447A
MPC7447
Number of 32-byte sectors/line
MPC7445
MPC7441
2
Parity
Byte
Thermal Control
4
Dynamic frequency switching (DFS)
Yes
No
No
No
Thermal diode
Yes
No
No
No
General Parameters
The following list is a summary of the general parameters of the MPC7447A:
Technology
Die size
Transistor count
Logic design
Packages
Core power supply
I/O power supply
5
0.13-μm CMOS, nine-layer metal
8.51 mm × 9.86 mm
48.6 million
Fully-static
Surface mount 360 ceramic ball grid array (HCTE)
Surface mount RoHS-compliant 360 ceramic ball grid array (HCTE)
Surface mount 360 ceramic land grid array (HCTE)
1.3 V ± 50 mV DC (nominal), or
1.2 V ± 50 mV DC (derated)
1.8 V ± 5% DC, or
2.5 V ± 5% DC
Electrical and Thermal Characteristics
This section provides the AC and DC electrical specifications and thermal characteristics for the
MPC7447A.
5.1
DC Electrical Characteristics
The tables in this section describe the MPC7447A DC electrical characteristics. Table 2 provides the
absolute maximum ratings.
Table 2. Absolute Maximum Ratings1
Characteristic
Symbol
Maximum Value
Core supply voltage
VDD
–0.3 to 1.60
V
2
PLL supply voltage
AVDD
–0.3 to 1.60
V
2
BVSEL = 0
OVDD
–0.3 to 1.95
V
3, 4
BVSEL = HRESET or OVDD
OVDD
–0.3 to 2.7
V
3, 5
Processor bus
Vin
–0.3 to OVDD + 0.3
V
6, 7
JTAG signals
Vin
–0.3 to OVDD + 0.3
V
—
Processor bus supply voltage
Input voltage
Unit Notes
MPC7447A RISC Microprocessor Hardware Specifications, Rev. 5
Freescale Semiconductor
9
Electrical and Thermal Characteristics
Table 2. Absolute Maximum Ratings1 (continued)
Characteristic
Symbol
Maximum Value
Tstg
–55 to 150
Storage temperature range
Unit Notes
°C
—
Notes:
1. Functional and tested operating conditions are given in Table 4. Absolute maximum ratings are stress ratings only, and
functional operation at the maximums is not guaranteed. Stresses beyond those listed may affect device reliability or cause
permanent damage to the device.
2. Caution: VDD/AVDD must not exceed OVDD by more than 1.0 V during normal operation; this limit may be exceeded for a
maximum of 20 ms during the power-on reset and power-down sequences.
3. Caution: OVDD must not exceed VDD/AVDD by more than 2.0 V during normal operation; this limit may be exceeded for a
maximum of 20 ms during the power-on reset and power-down sequences.
4. BVSEL must be set to 0, such that the bus is in 1.8-V mode.
5. BVSEL must be set to HRESET or 1, such that the bus is in 2.5-V mode.
6. Caution: Vin must not exceed OVDD by more than 0.3 V at any time including during power-on reset.
7. Vin may overshoot/undershoot to a voltage and for a maximum duration as shown in Figure 2.
Figure 2 shows the undershoot and overshoot voltage on the MPC7447A.
OVDD + 20%
OV DD + 5%
OVDD
VIH
VIL
GND
GND – 0.3 V
GND – 0.7 V
Not to Exceed 10%
of tSYSCLK
Figure 2. Overshoot/Undershoot Voltage
The MPC7447A provides several I/O voltages to support both compatibility with existing systems and
migration to future systems. The MPC7447A core voltage must always be provided at the nominal voltage
(see Table 4) or at the supported derated voltage (see Section 5.3, “Voltage and Frequency Derating”). The
input voltage threshold for each bus is selected by sampling the state of the voltage select pins at the
negation of the signal HRESET. The output voltage will swing from GND to the maximum voltage applied
to the OVDD power pins. Table 3 provides the input threshold voltage settings. Because these settings may
change in future products, it is recommended that BVSEL be configured using resistor options, jumpers,
or some other flexible means, with the capability to reconfigure the termination of this signal in the future
if necessary.
MPC7447A RISC Microprocessor Hardware Specifications, Rev. 5
10
Freescale Semiconductor
Electrical and Thermal Characteristics
Table 3. Input Threshold Voltage Settings
BVSEL Signal
Processor Bus Input Threshold is Relative to:
Notes
0
1.8 V
1, 2
¬HRESET
Not available
1
HRESET
2.5 V
1
1
2.5 V
1
Notes:
1. Caution: The input threshold selection must agree with the OV DD voltages supplied. See notes in Table 2.
2. If used, pull-down resistors should be less than 250 Ω.
Table 4 provides the recommended operating conditions for the MPC7447A.
NOTE
Table 4 describes the nominal operating conditions of the device. For
information regarding the operation of the device at supported derated core
voltage conditions, see Section 5.3, “Voltage and Frequency Derating.”
Table 4. Recommended Operating Conditions1
Recommended Value
Characteristic
Symbol
Minimum
Unit
Notes
Maximum
Core supply voltage
VDD
1.3 V ± 50 mV
V
3
PLL supply voltage
AVDD
1.3 V ± 50 mV
V
2, 3
BVSEL = 0
OV DD
1.8 V ± 5%
V
BVSEL = HRESET or OVDD
OV DD
2.5 V ± 5%
Processor bus supply voltage
Input voltage
Processor bus
Vin
GND
OV DD
JTAG signals
Vin
GND
OV DD
Tj
0
105
Die-junction temperature
V
°C
Notes:
1. These are the recommended and tested operating conditions. In addition, these devices also support voltage
derating; see Section 5.3, “Voltage and Frequency Derating.” Proper device operation outside of these conditions
and those specified in Section 5.3 is not guaranteed.
2. This voltage is the input to the filter discussed in Section 9.2, “PLL Power Supply Filtering,” and not necessarily the
voltage at the AVDD pin, which may be reduced from VDD by the filter.
3. VDD and AVDD may be reduced in order to reduce power consumption if further maximum core frequency
constraints are observed. See Section 5.3, “Voltage and Frequency Derating,” for specific information.
Table 5 provides the package thermal characteristics for the MPC7447A.
Table 5. Package Thermal Characteristics1
Characteristic
Symbol
Value
Unit
Notes
Junction-to-ambient thermal resistance, natural convection, single-layer (1s) board
RθJA
26
°C/W
2, 3
Junction-to-ambient thermal resistance, natural convection, four-layer (2s2p) board
RθJMA
19
°C/W
2, 4
Junction-to-ambient thermal resistance, 200 ft/min airflow, single-layer (1s) board
RθJMA
20
°C/W
2, 4
MPC7447A RISC Microprocessor Hardware Specifications, Rev. 5
Freescale Semiconductor
11
Electrical and Thermal Characteristics
Table 5. Package Thermal Characteristics1 (continued)
Characteristic
Junction-to-ambient thermal resistance, 200 ft/min airflow, four-layer (2s2p) board
Symbol
Value
Unit
Notes
RθJMA
16
°C/W
2, 4
Junction-to-board thermal resistance
RθJB
10
°C/W
5
Junction-to-case thermal resistance
RθJC
< 0.1
°C/W
6
Notes:
1. Refer to Section 9.8, “Thermal Management Information,” for details about thermal management.
2. Junction temperature is a function of on-chip power dissipation, package thermal resistance, mounting site (board)
temperature, ambient temperature, airflow, power dissipation of other components on the board, and board thermal resistance.
3. Per SEMI G38-87 and JEDEC JESD51-2 with the single-layer board horizontal.
4. Per JEDEC JESD51-6 with the board horizontal.
5. Thermal resistance between the die and the printed-circuit board per JEDEC JESD51-8. Board temperature is measured on
the top surface of the board near the package.
6. This is the thermal resistance between the die and the case top surface as measured by the cold plate method (MIL SPEC-883
Method 1012.1) with the calculated case temperature. The actual value of RθJC for the part is less than 0.1°C/W.
Table 6 provides the DC electrical characteristics for the MPC7447A.
Table 6. DC Electrical Specifications
At recommended operating conditions. See Table 4.
Nominal
Bus
Voltage 1
Symbol
Min
Max
Unit
Notes
Input high voltage
(all inputs)
1.8
VIH
OVDD × 0.65
OVDD + 0.3
V
2
1.7
OVDD + 0.3
Input low voltage
(all inputs)
1.8
–0.3
OVDD × 0.35
V
2, 6
–0.3
0.7
µA
2, 3
µA
2, 3, 4
Characteristic
2.5
VIL
2.5
Input leakage current,
Vin = OV DD
Vin = GND
—
High-impedance (off-state) leakage current,
Vin = OV DD
Vin = GND
—
Output high voltage @ IOH = –5 mA
1.8
Iin
—
30
– 30
ITSI
30
– 30
VOH
2.5
Output low voltage @ IOL = 5 mA
—
1.8
2.5
VOL
OVDD – 0.45
—
1.8
—
—
0.45
—
0.6
V
V
MPC7447A RISC Microprocessor Hardware Specifications, Rev. 5
12
Freescale Semiconductor
Electrical and Thermal Characteristics
Table 6. DC Electrical Specifications (continued)
At recommended operating conditions. See Table 4.
Nominal
Bus
Voltage 1
Characteristic
Capacitance,
Vin = 0 V, f = 1 MHz
Symbol
Min
Max
Unit
Notes
Cin
—
8.0
pF
5
All other inputs
Notes:
1. Nominal voltages; see Table 4 for recommended operating conditions.
2. For processor bus signals, the reference is OVDD
3. Excludes test signals and IEEE 1149.1 boundary scan (JTAG) signals
4. The leakage is measured for nominal OVDD and V DD, or both OVDD and VDD must vary in the same direction (for
example, both OV DD and VDD vary by either +5% or –5%).
5. Capacitance is periodically sampled rather than 100% tested.
6. Excludes signals with internal pullups: BVSEL, LSSD_MODE, TDI, TMS, and TRST.
Table 7 provides the power consumption for the MPC7447A. For information regarding power
consumption when dynamic frequency switching is enabled, see Section 9.8.5, “Dynamic Frequency
Switching (DFS).”
NOTE
The power consumption information in this table applies when the device is
operated at the nominal core voltage indicated in Table 4. For power
consumption at derated core voltage conditions, see Section 5.3, “Voltage
and Frequency Derating.”
Table 7. Power Consumption for MPC7447A
Processor (CPU) Frequency
1000
1267
1333 5
Unit
Notes
1420 MHz
Full-Power Mode
Typical
16.0
18.3
18.0
21.0
W
1, 2
Maximum
23.0
26.0
25.0
30.0
W
1, 3
3.3
4.1
W
1, 2
3.3
4.1
W
1, 2
Nap Mode
Typical
4.1
4.1
Sleep Mode
Typical
4.1
4.1
Deep Sleep Mode (PLL Disabled)
MPC7447A RISC Microprocessor Hardware Specifications, Rev. 5
Freescale Semiconductor
13
Electrical and Thermal Characteristics
Table 7. Power Consumption for MPC7447A (continued)
Processor (CPU) Frequency
Typical
1000
1267
1333 5
1420 MHz
4.1
4.0
3.2
4.0
Unit
Notes
W
1, 2
Notes:
1. These values specify the power consumption for the core power supply (VDD) at nominal voltage and apply
to all valid processor bus frequencies and configurations. The values do not include I/O supply power (OVDD)
or PLL supply power (AVDD). OVDD power is system dependent but is typically < 5% of VDD power. Worst
case power consumption for AVDD < 3 mW.
2. Typical power is an average value measured at the nominal recommended VDD (see Table 4) and 65°C while
running the Dhrystone 2.1 benchmark and achieving 2.3 Dhrystone MIPs/MHz.
3. Maximum power is the average measured at nominal VDD and maximum operating junction temperature (see
Table 4) while running an entirely cache-resident, contrived sequence of instructions which keep all the
execution units maximally busy.
4. Doze mode is not a user-definable state; it is an intermediate state between full-power and either nap or sleep
mode. As a result, power consumption for this mode is not tested.
5. Power consumption for these devices is artificially constrained during screening to assure lower power
consumption than other speed grades.
5.2
AC Electrical Characteristics
This section provides the AC electrical characteristics for the MPC7447A. After fabrication, functional
parts are sorted by maximum processor core frequency as shown in Section 5.2.1, “Clock AC
Specifications,” and tested for conformance to the AC specifications for that frequency. The processor core
frequency is determined by the bus (SYSCLK) frequency and the settings of the PLL_CFG[0:4] signals,
and can be dynamically modified using dynamic frequency switching (DFS). Parts are sold by maximum
processor core frequency; see Section 11, “Ordering Information,” for information on ordering parts. DFS
is described in Section 9.8.5, “Dynamic Frequency Switching (DFS).”
5.2.1
Clock AC Specifications
Table 8 provides the clock AC timing specifications as defined in Figure 3 and represents the tested
operating frequencies of the devices. The maximum system bus frequency, fSYSCLK, given in Table 8, is
considered a practical maximum in a typical single-processor system. The actual maximum SYSCLK
frequency for any application of the MPC7447A will be a function of the AC timings of the MPC7447A,
the AC timings for the system controller, bus loading, printed-circuit board topology, trace lengths, and so
forth, and may be less than the value given in Table 8.
NOTE
The core frequency information in this table applies when operating the
device at the nominal core voltage indicated in Table 4. For core frequency
specifications at derated core voltage conditions, see Section 5.3, “Voltage
and Frequency Derating.”
MPC7447A RISC Microprocessor Hardware Specifications, Rev. 5
14
Freescale Semiconductor
Electrical and Thermal Characteristics
Table 8. Clock AC Timing Specifications
At recommended operating conditions. See Table 4.
Maximum Processor Core Frequency
Characteristic
Symbol
1000 MHz
1267 MHz
1333 MHz
1420 MHz
Unit Notes
Min
Max
Min
Max
Min
Max
Min
Max
1000
600
1267
600
1333
600
1420
Processor core frequency
fcore
600
VCO frequency
fVCO
1200 2000 1200 2533 1200 2667 1200 2840
MHz 1, 8, 9
MHz
1, 9
SYSCLK frequency
fSYSCLK
33
167
33
167
33
167
33
167
SYSCLK cycle time
tSYSCLK
6.0
30
6.0
30
6.0
30
6.0
30
ns
2
SYSCLK rise and fall time
tKR, tKF
—
1.0
—
1.0
—
1.0
—
1.0
ns
3
SYSCLK duty cycle measured at
OVDD/2
tKHKL/
tSYSCLK
40
60
40
60
40
60
40
60
%
4
SYSCLK cycle-to-cycle jitter
—
150
—
150
—
150
—
150
ps
5, 6
Internal PLL relock time
—
100
—
100
—
100
—
100
μs
7
MHz 1, 2, 8
Notes:
1. Caution: The SYSCLK frequency and PLL_CFG[0:4] settings must be chosen such that the resulting SYSCLK (bus)
frequency, processor core frequency, and PLL (VCO) frequency do not exceed their respective maximum or minimum
operating frequencies. Refer to the PLL_CFG[0:4] signal description in Section 9.1.1, “PLL Configuration,” for valid
PLL_CFG[0:4] settings.
2. Assumes a lightly-loaded, single-processor system.
3. Rise and fall times for the SYSCLK input measured from 0.4 to 1.4 V.
4. Timing is guaranteed by design and characterization.
5. Guaranteed by design.
6. The SYSCLK driver’s closed loop jitter bandwidth should be less than 1.5 MHz at –3 dB.
7. Relock timing is guaranteed by design and characterization. PLL relock time is the maximum amount of time required
for PLL lock after a stable V DD and SYSCLK are reached during the power-on reset sequence. This specification also
applies when the PLL has been disabled and subsequently re-enabled during sleep mode. Also note that HRESET
must be held asserted for a minimum of 255 bus clocks after the PLL relock time during the power-on reset sequence.
8. Caution: If DFS is enabled, the SYSCLK frequency and PLL_CFG[0:4] settings must be chosen such that the
resulting processor frequency is greater than or equal to the minimum core frequency.
9. Caution: These values specify the maximum processor core and VCO frequencies when the device is operated at
the nominal core voltage. If operating the device at the derated core voltage, the processor core and VCO frequencies
must be reduced. See Section 5.3, “Voltage and Frequency Derating,” for more information.
Figure 3 provides the SYSCLK input timing diagram.
SYSCLK
VM
VM
tKHKL
VM
CVIH
CVIL
tKR
tKF
tSYSCLK
VM = Midpoint Voltage (OV DD/2)
Figure 3. SYSCLK Input Timing Diagram
MPC7447A RISC Microprocessor Hardware Specifications, Rev. 5
Freescale Semiconductor
15
Electrical and Thermal Characteristics
5.2.2
Processor Bus AC Specifications
Table 9 provides the processor bus AC timing specifications for the MPC7447A as defined in Figure 4 and
Figure 5.
Table 9. Processor Bus AC Timing Specifications1
At recommended operating conditions. See Table 4.
Parameter
Input setup times:
A[0:35], AP[0:4]
D[0:63], DP[0:7]
AACK, ARTRY, BG, CKSTP_IN, DBG, DTI[0:3], GBL,
TT[0:3], QACK, TA, TBEN, TEA, TS, EXT_QUAL,
PMON_IN, SHD[0:1]
BMODE[0:1], BVSEL
Input hold times:
A[0:35], AP[0:4]
D[0:63], DP[0:7]
AACK, ARTRY, BG, CKSTP_IN, DBG, DTI[0:3], GBL,
TT[0:3], QACK, TA, TBEN, TEA, TS, EXT_QUAL,
PMON_IN, SHD[0:1]
BMODE[0:1], BVSEL
Output valid times:
A[0:35], AP[0:4]
D[0:63], DP[0:7]
AACK, BR, CI, CKSTP_IN, DRDY, DTI[0:3], GBL, HIT,
PMON_OUT, QREQ, TBST, TSIZ[0:2], TT[0:3], WT
TS
ARTRY, SHD[0:1]
Symbol 2
All Speed Grades
Unit
Notes
Min
Max
tAVKH
tDVKH
tIVKH
1.8
1.8
1.8
—
—
—
—
—
—
tMVKH
1.8
—
8
tAXKH
tDXKH
tIXKH
0
0
0
—
—
—
—
—
—
—
tMXKH
0
—
8
tKHAV
tKHDV
tKHOV
—
—
—
2.0
2.0
2.0
tKHTSV
tKHARV
—
—
2.0
2.0
ns
ns
ns
ns
Output hold times:
A[0:35], AP[0:4]
D[0:63], DP[0:7]
AACK, BR, CI, CKSTP_IN, DRDY, DTI[0:3], GBL, HIT,
PMON_OUT, QREQ, TBST, TSIZ[0:2], TT[0:3], WT
TS
ARTRY, SHD[0:1]
tKHAX
tKHDX
tKHOX
0.5
0.5
0.5
—
—
—
tKHTSX
tKHARX
0.5
0.5
—
—
SYSCLK to output enable
tKHOE
0.5
—
ns
5
SYSCLK to output high impedance (all except TS, ARTRY,
SHD0, SHD1)
tKHOZ
—
3.5
ns
5
SYSCLK to TS high impedance after precharge
tKHTSPZ
—
1
tSYSCLK
3, 4, 5
Maximum delay to ARTRY/SHD0/SHD1 precharge
tKHARP
—
1
tSYSCLK 3, 5, 6, 7
MPC7447A RISC Microprocessor Hardware Specifications, Rev. 5
16
Freescale Semiconductor
Electrical and Thermal Characteristics
Table 9. Processor Bus AC Timing Specifications1 (continued)
At recommended operating conditions. See Table 4.
All Speed Grades
Symbol 2
Parameter
SYSCLK to ARTRY/SHD0/SHD1 high impedance after
precharge
Unit
tKHARPZ
Min
Max
—
2
Notes
tSYSCLK 3, 5, 6, 7
Notes:
1. All input specifications are measured from the midpoint of the signal in question to the midpoint of the rising edge
of the input SYSCLK. All output specifications are measured from the midpoint of the rising edge of SYSCLK to
the midpoint of the signal in question. All output timings assume a purely resistive 50-Ω load (see Figure 4). Input
and output timings are measured at the pin; time-of-flight delays must be added for trace lengths, vias, and
connectors in the system.
2. The symbology used for timing specifications herein follows the pattern of t(signal)(state)(reference)(state) for inputs
and t(reference)(state)(signal)(state) for outputs. For example, tIVKH symbolizes the time input signals (I) reach the valid
state (V) relative to the SYSCLK reference (K) going to the high (H) state or input setup time. And tKHOV
symbolizes the time from SYSCLK(K) going high (H) until outputs (O) are valid (V) or output valid time. Input hold
time can be read as the time that the input signal (I) went invalid (X) with respect to the rising clock edge (KH)
(note the position of the reference and its state for inputs) and output hold time can be read as the time from the
rising edge (KH) until the output went invalid (OX).
3. tsysclk is the period of the external clock (SYSCLK) in ns. The numbers given in the table must be multiplied by
the period of SYSCLK to compute the actual time duration (in ns) of the parameter in question.
4. According to the bus protocol, TS is driven only by the currently active bus master. It is asserted low and
precharged high before returning to high impedance, as shown in Figure 6. The nominal precharge width for TS
is 0.5 × tSYSCLK, that is, less than the minimum tSYSCLK period, to ensure that another master asserting TS on
the following clock will not contend with the precharge. Output valid and output hold timing is tested for the signal
asserted. Output valid time is tested for precharge.The high-impedance behavior is guaranteed by design.
5. Guaranteed by design and not tested.
6. According to the bus protocol, ARTRY can be driven by multiple bus masters through the clock period immediately
following AACK. Bus contention is not an issue because any master asserting ARTRY will be driving it low. Any
master asserting it low in the first clock following AACK will then go to high impedance for 1 clock before
precharging it high during the second cycle after the assertion of AACK. The nominal precharge width for ARTRY
is 1.0 tSYSCLK; that is, it should be high impedance as shown in Figure 6 before the first opportunity for another
master to assert ARTRY. Output valid and output hold timing is tested for the signal asserted.The high-impedance
behavior is guaranteed by design.
7. According to the MPX bus protocol, SHD0 and SHD1 can be driven by multiple bus masters beginning the cycle
of TS. Timing is the same as ARTRY, that is, the signal is high impedance for a fraction of a cycle, then negated
for up to an entire cycle (crossing a bus cycle boundary) before being three-stated again. The nominal precharge
width for SHD0 and SHD1 is 1.0 tSYSCLK. The edges of the precharge vary depending on the programmed ratio
of core to bus (PLL configurations).
8. BMODE[0:1] and BVSEL are mode select inputs and are sampled before and after HRESET negation. These
parameters represent the input setup and hold times for each sample. These values are guaranteed by design
and not tested. These inputs must remain stable after the second sample. See Figure 5 for sample timing.
Figure 4 provides the AC test load for the MPC7447A.
Output
Z0 = 50 Ω
RL = 50 Ω
OVDD/2
Figure 4. AC Test Load
MPC7447A RISC Microprocessor Hardware Specifications, Rev. 5
Freescale Semiconductor
17
Electrical and Thermal Characteristics
Figure 5 provides the mode select input timing diagram for the MPC7447A. The mode select inputs are
sampled twice, once before and once after HRESET negation.
VM
VM
SYSCLK
HRESET
Mode Signals
2nd Sample
1st Sample
VM = Midpoint Voltage (OV DD/2)
Figure 5. Mode Input Sample Timing Diagram
Figure 6 provides the input/output timing diagram for the MPC7447A.
SYSCLK
VM
VM
VM
tAVKH
tIVKH
tMVKH
tAXKH
tIXKH
tMXKH
All Inputs
All Outputs
(Except TS,
ARTRY, SHD0, SHD1)
tKHAV
tKHAX
tKHDV
tKHDX
tKHOV
tKHOX
tKHOE
tKHOZ
All Outputs
(Except TS,
ARTRY, SHD0, SHD1)
tKHTSPZ
tKHTSV
tKHTSX
tKHTSV
TS
tKHARPZ
tKHARV
ARTRY,
SHD0,
SHD1
tKHARP
tKHARX
VM = Midpoint Voltage (OV DD/2)
Figure 6. Input/Output Timing Diagram
MPC7447A RISC Microprocessor Hardware Specifications, Rev. 5
18
Freescale Semiconductor
Electrical and Thermal Characteristics
5.2.3
IEEE 1149.1 AC Timing Specifications
Table 10 provides the IEEE 1149.1 (JTAG) AC timing specifications as defined in Figure 16 through
Figure 19.
Table 10. JTAG AC Timing Specifications (Independent of SYSCLK)1
At recommended operating conditions. See Table 4.
Parameter
Symbol
Min
Max
Unit
TCK frequency of operation
fTCLK
0
33.3
MHz
TCK cycle time
tTCLK
30
—
ns
TCK clock pulse width measured at 1.4 V
tJHJL
15
—
ns
tJR and tJF
—
2
ns
TRST assert time
tTRST
25
—
ns
2
Input setup times:
Boundary-scan data
TMS, TDI
ns
3
tDVJH
tIVJH
4
0
—
—
Input hold times:
Boundary-scan data
TMS, TDI
ns
3
tDXJH
tIXJH
20
25
—
—
Valid times:
Boundary-scan data
TDO
ns
4
tJLDV
tJLOV
4
4
20
25
Output hold times:
Boundary-scan data
TDO
ns
4
tJLDX
tJLOX
30
30
—
—
TCK to output high impedance:
Boundary-scan data
TDO
ns
4, 5
tJLDZ
tJLOZ
3
3
19
9
TCK rise and fall times
Notes
Notes:
1. All outputs are measured from the midpoint voltage of the falling/rising edge of TCLK to the midpoint of the signal
in question. The output timings are measured at the pins. All output timings assume a purely resistive 50-Ω load
(see Figure 7). Time-of-flight delays must be added for trace lengths, vias, and connectors in the system.
2. TRST is an asynchronous level sensitive signal. The time is for test purposes only.
3. Non-JTAG signal input timing with respect to TCK.
4. Non-JTAG signal output timing with respect to TCK.
5. Guaranteed by design and characterization.
Figure 7 provides the AC test load for TDO and the boundary-scan outputs of the MPC7447A.
Output
Z0 = 50 Ω
RL = 50 Ω
OVDD/2
Figure 7. Alternate AC Test Load for the JTAG Interface
MPC7447A RISC Microprocessor Hardware Specifications, Rev. 5
Freescale Semiconductor
19
Electrical and Thermal Characteristics
Figure 8 provides the JTAG clock input timing diagram.
TCLK
VM
VM
VM
tJHJL
tJR
tJF
tTCLK
VM = Midpoint Voltage (OVDD/2)
Figure 8. JTAG Clock Input Timing Diagram
Figure 9 provides the TRST timing diagram.
VM
VM
TRST
tTRST
VM = Midpoint Voltage (OVDD/2)
Figure 9. TRST Timing Diagram
Figure 10 provides the boundary-scan timing diagram.
TCK
VM
VM
tDVJH
Boundary
Data Inputs
tDXJH
Input
Data Valid
tJLDV
tJLDX
Boundary
Data Outputs
Output Data Valid
tJLDZ
Boundary
Data Outputs
Output Data Valid
VM = Midpoint Voltage (OV DD/2)
Figure 10. Boundary-Scan Timing Diagram
MPC7447A RISC Microprocessor Hardware Specifications, Rev. 5
20
Freescale Semiconductor
Electrical and Thermal Characteristics
Figure 11 provides the test access port timing diagram.
TCK
VM
VM
tIVJH
tIXJH
Input
Data Valid
TDI, TMS
tJLOV
tJLOX
Output Data Valid
TDO
tJLOZ
TDO
Output Data Valid
VM = Midpoint Voltage (OVDD/2)
Figure 11. Test Access Port Timing Diagram
5.3
Voltage and Frequency Derating
To reduce the power consumption of the device, these devices support voltage and frequency derating
whereby the core voltage (VDD) may be reduced if the reduced maximum processor core frequency
requirements are observed. The supported derated core voltage, resulting maximum processor core
frequency (fcore), and power consumption are provided in Table 11. Only those parameters in Table 11 are
affected; all other parameter specifications are unaffected.
Table 11. Supported Voltage, Core Frequency, and Power Consumption Derating
Maximum Rated
Core Frequency
(Device Marking)
Supported
Derated Core
Voltage (VDD)
Maximum Derated Core
Frequency (fcore)
1000
1.20 V ±50mV
Full-Power Mode Power
Consumption
Maximum
Typical
867 MHz
15.5 W
10.5 W
1267
1065 MHz
18.2 W
12.3 W
1333
1167 MHz
18.1 W
12.3 W
1420
1267 MHz
21.0 W
14.2 W
MPC7447A RISC Microprocessor Hardware Specifications, Rev. 5
Freescale Semiconductor
21
Pin Assignments
6
Pin Assignments
Figure 12 (in Part A) shows the pinout of the MPC7447A, 360 high coefficient of thermal expansion
ceramic ball grid array (HCTE) package as viewed from the top surface. Part B shows the side profile of
the HCTE package to indicate the direction of the top surface view.
Part A
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16 17 18 19
A
B
C
D
E
F
G
H
J
K
L
M
N
P
R
T
U
V
W
Not to Scale
Part B
Substrate Assembly
Encapsulant
View
Die
Figure 12. Pinout of the MPC7447A, 360 HCTE Package as Viewed from the Top Surface
MPC7447A RISC Microprocessor Hardware Specifications, Rev. 5
22
Freescale Semiconductor
Pinout Listings
7
Pinout Listings
Table 12 provides the pinout listing for the MPC7447A, 360 HCTE package. The pinouts of the
MPC7447A and MPC7447 are pin compatible, but there have been some changes. An MPC7447A may
be populated on a board designed for a MPC7447 provided all pins defined as ‘no connect’ for the
MPC7447 are unterminated as required by the MPC7457 RISC Microprocessor Hardware Specifications.
The MPC7447A uses pins previously marked ‘no connect’ for the temperature diode pins and for
additional power and ground connections. Because these ‘no connect’ pins in the MPC7447 360 pin
package are not driven in functional mode, an MPC7447 can be populated in an MPC7447A board. See
Section 9.4, “Connection Recommendations,” for additional information.
NOTE
Caution must be exercised when performing boundary scan test operations
on a board designed for an MPC7447A but populated with an MPC7447.
This is because in the MPC7447 it is possible to drive the latches associated
with the former ‘no connect’ pins in the MPC7447, potentially causing
contention on those pins. To prevent this, ensure that these pins are not
connected on the board or, if they are connected, ensure that the states of
internal MPC7447 latches do not cause these pins to be driven during board
testing.
NOTE
This pinout is not compatible with the MPC750, MPC7400, or MPC7410
360 BGA and LGA package.
Table 12. Pinout Listing for the MPC7447A, 360 HCTE Package
Pin Number
Active
I/O
I/F Select1
Notes
A[0:35]
E11, H1, C11, G3, F10, L2, D11, D1, C10, G2, D12,
L3, G4, T2, F4, V1, J4, R2, K5, W2, J2, K4, N4, J3, M5,
P5, N3, T1, V2, U1, N5, W1, B12, C4, G10, B11
High
I/O
BVSEL
2
AACK
R1
Low
Input
BVSEL
AP[0:4]
C1, E3, H6, F5, G7
High
I/O
BVSEL
2
ARTRY
N2
Low
I/O
BVSEL
3
AVDD
A8
—
Input
N/A
BG
M1
Low
Input
BVSEL
BMODE0
G9
Low
Input
BVSEL
4
BMODE1
F8
Low
Input
BVSEL
5
BR
D2
Low
Output
BVSEL
BVSEL
B7
High
Input
BVSEL
CI
J1
Low
Output
BVSEL
CKSTP_IN
A3
Low
Input
BVSEL
CKSTP_OUT
B1
Low
Output
BVSEL
Signal Name
1, 6
MPC7447A RISC Microprocessor Hardware Specifications, Rev. 5
Freescale Semiconductor
23
Pinout Listings
Table 12. Pinout Listing for the MPC7447A, 360 HCTE Package (continued)
Signal Name
Pin Number
Active
I/O
I/F Select1
Notes
CLK_OUT
H2
High
Output
BVSEL
D[0:63]
R15, W15, T14, V16, W16, T15, U15, P14, V13, W13,
T13, P13, U14, W14, R12, T12, W12, V12, N11, N10,
R11, U11, W11, T11, R10, N9, P10, U10, R9, W10,
U9, V9, W5, U6, T5, U5, W7, R6, P7, V6, P17, R19,
V18, R18, V19, T19, U19, W19, U18, W17, W18, T16,
T18, T17, W3, V17, U4, U8, U7, R7, P6, R8, W8, T8
High
I/O
BVSEL
DBG
M2
Low
Input
BVSEL
DP[0:7]
T3, W4, T4, W9, M6, V3, N8, W6
High
I/O
BVSEL
DRDY
R3
Low
Output
BVSEL
7
DTI[0:3]
G1, K1, P1, N1
High
Input
BVSEL
8
EXT_QUAL
A11
High
Input
BVSEL
9
GBL
E2
Low
I/O
BVSEL
GND
B5, C3, D6, D13, E17, F3, G17, H4, H7, H9, H11, H13,
J6, J8, J10, J12, K7, K3, K9, K11, K13, L6, L8, L10,
L12, M4, M7, M9, M11, M13, N7, P3, P9, P12, R5,
R14, R17, T7, T10, U3, U13, U17, V5, V8, V11, V15
—
—
N/A
GND
A17, A19, B13, B16, B18, E12, E19, F13, F16, F18,
G19, H18, J14, L14, M15, M17, M19, N14, N16, P15,
P19
—
—
N/A
15
GND_SENSE
G12, N13
—
—
N/A
19
HIT
B2
Low
Output
BVSEL
7
HRESET
D8
Low
Input
BVSEL
INT
D4
Low
Input
BVSEL
L1_TSTCLK
G8
High
Input
BVSEL
9
L2_TSTCLK
B3
High
Input
BVSEL
10
NC (no connect)
A6, A14, A15, B14, B15, C14, C15, C16, C17, C18,
C19, D14, D15, D16, D17, D18, D19, E14, E15, F14,
F15, G14, G15, H15, H16, J15, J16, J17, J18, J19,
K15, K16, K17, K18, K19, L15, L16, L17, L18, L19
—
—
—
11
LSSD_MODE
E8
Low
Input
BVSEL
6, 12
MCP
C9
Low
Input
BVSEL
OVDD
B4, C2, C12, D5, F2, H3, J5, K2, L5, M3, N6, P2, P8,
P11, R4, R13, R16, T6, T9, U2, U12, U16, V4, V7,
V10, V14
—
—
N/A
OVDD_SENSE
E18, G18
—
—
N/A
PLL_CFG[0:4]
B8, C8, C7, D7, A7
High
Input
BVSEL
PMON_IN
D9
Low
Input
BVSEL
PMON_OUT
A9
Low
Output
BVSEL
16
13
MPC7447A RISC Microprocessor Hardware Specifications, Rev. 5
24
Freescale Semiconductor
Pinout Listings
Table 12. Pinout Listing for the MPC7447A, 360 HCTE Package (continued)
Signal Name
Pin Number
Active
I/O
I/F Select1
Notes
QACK
G5
Low
Input
BVSEL
QREQ
P4
Low
Output
BVSEL
SHD[0:1]
E4, H5
Low
I/O
BVSEL
SMI
F9
Low
Input
BVSEL
SRESET
A2
Low
Input
BVSEL
SYSCLK
A10
—
Input
BVSEL
TA
K6
Low
Input
BVSEL
TBEN
E1
High
Input
BVSEL
TBST
F11
Low
Output
BVSEL
TCK
C6
High
Input
BVSEL
TDI
B9
High
Input
BVSEL
TDO
A4
High
Output
BVSEL
TEA
L1
Low
Input
BVSEL
TEMP_ANODE
N18
17
TEMP_CATHODE
N19
17
TEST[0:3]
A12, B6, B10, E10
—
Input
BVSEL
12
TEST[4]
D10
—
Input
BVSEL
9
TMS
F1
High
Input
BVSEL
6
TRST
A5
Low
Input
BVSEL
6, 14
TS
L4
Low
I/O
BVSEL
3
TSIZ[0:2]
G6, F7, E7
High
Output
BVSEL
TT[0:4]
E5, E6, F6, E9, C5
High
I/O
BVSEL
WT
D3
Low
Output
BVSEL
VDD
H8, H10, H12, J7, J9, J11, J13, K8, K10, K12, K14, L7,
L9, L11, L13, M8, M10, M12
—
—
N/A
VDD
A13, A16, A18, B17, B19, C13, E13, E16, F12, F17,
F19, G11, G16, H14, H17, H19, M14, M16, M18, N15,
N17, P16, P18
—
—
N/A
3
6
15
MPC7447A RISC Microprocessor Hardware Specifications, Rev. 5
Freescale Semiconductor
25
Pinout Listings
Table 12. Pinout Listing for the MPC7447A, 360 HCTE Package (continued)
Signal Name
VDD_SENSE
Pin Number
G13, N12
Active
I/O
I/F Select1
Notes
—
—
N/A
18
Notes:
1. OVDD supplies power to the processor bus, JTAG, and all control signals; VDD supplies power to the processor core and the
PLL (after filtering to become AVDD). To program the I/O voltage, connect BVSEL to either GND (selects 1.8 V), or to
HRESET or OVDD (selects 2.5 V); see Table 3. If used, the pull-down resistor should be less than 250 Ω. Because these
settings may change in future products, it is recommended BVSEL be configured using resistor options, jumpers, or some
other flexible means, with the capability to reconfigure the termination of this signal in the future if necessary. For actual
recommended value of Vin or supply voltages see Table 4.
2. Unused address pins must be pulled down to GND and corresponding address parity pins pulled up to OVDD.
3. These pins require weak pull-up resistors (for example, 4.7 KΩ ) to maintain the control signals in the negated state after they
have been actively negated and released by the MPC7447A and other bus masters.
4. This signal selects between MPX bus mode (asserted) and 60x bus mode (negated) and will be sampled at HRESET going
high.
5. This signal must be negated during reset, by pull-up resistor to OV DD or negation by ¬HRESET (inverse of HRESET), to
ensure proper operation.
6. Internal pull up on die.
7. Ignored in 60x bus mode.
8. These signals must be pulled down to GND if unused, or if the MPC7447A is in 60x bus mode.
9. These input signals are for factory use only and must be pulled down to GND for normal machine operation.
10.This test signal is recommended to be tied to HRESET; however, other configurations will not adversely affect performance.
11.These signals are for factory use only and must be left unconnected for normal machine operation. Some pins that were
NCs on the MPC7447, MPC7445, and MPC7441 have now been defined for other purposes.
12.These input signals are for factory use only and must be pulled up to OVDD for normal machine operation.
13.This pin can externally cause a performance monitor event. Counting of the event is enabled through software.
14.This signal must be asserted during reset, by pull down to GND or assertion by HRESET, to ensure proper operation.
15.These pins were NCs on the MPC7447, MPC7445, and MPC7441. They may be left unconnected for backward compatibility
with these devices, but it is recommended they be connected in new designs to facilitate future products. See Section 9.4,
“Connection Recommendations,” for more information.
16.These pins were OVDD pins on the MPC7447, MPC7445, and MPC7441. These pins are internally connected to OVDD and
are intended to allow an external device to detect the I/O voltage level present inside the device package. If unused, they
must be connected directly to OVDD or left unconnected.
17.These pins provide connectivity to the on-chip temperature diode that can be used to determine the die junction temperature
of the processor. These pins may be left unterminated if unused.
18.These pins are internally connected to V DD and are intended to allow an external device to detect the processor core voltage
level present inside the device package. If unused, they must be connected directly to VDD or left unconnected.
19.These pins are internally connected to GND and are intended to allow an external device to detect the processor ground
voltage level present inside the device package. If unused, they must be connected directly to GND or left unconnected.
MPC7447A RISC Microprocessor Hardware Specifications, Rev. 5
26
Freescale Semiconductor
Package Description
8
Package Description
The following sections provide the package parameters and mechanical dimensions for the HCTE
package.
8.1
Package Parameters for the MPC7447A, 360 HCTE BGA
The package parameters are as provided in the following list. The package type is 25 × 25 mm, 360-lead
high coefficient of thermal expansion ceramic ball grid array (HCTE).
Package outline
Interconnects
Pitch
Minimum module height
Maximum module height
Ball diameter
25 × 25 mm
360 (19 × 19 ball array – 1)
1.27 mm (50 mil)
2.72 mm
3.24 mm
0.89 mm (35 mil)
Coefficient of thermal expansion 12.3 ppm/°C
MPC7447A RISC Microprocessor Hardware Specifications, Rev. 5
Freescale Semiconductor
27
Package Description
8.2
Mechanical Dimensions for the MPC7447A, 360 HCTE BGA
Figure 13 provides the mechanical dimensions and bottom surface nomenclature for the MPC7447A, 360
HCTE BGA package.
2X
0.2
D
Capacitor Region
B
D1
D3
A1 CORNER
D2
A
1
0.15 A
NOTES:
1. Dimensioning and
tolerancing per ASME
Y14.5M, 1994
2. Dimensions in millimeters.
3. Top side A1 corner index is a
metalized feature with
various shapes. Bottom side
A1 corner is designated with
a ball missing from the array.
E3
E4
E
Millimeters
E2
E1
2X
0.2
D4
C
1 2 3 4 5 6 7 8 9 10 111213141516 171819
W
V
U
T
R
P
N
M
L
K
J
H
G
F
E
D
C
B
A
e
360X
b
0.3 A B C
0.15 A
A3
A2
A1
A
0.35 A
Dim
Min
Max
A
2.72
3.24
A1
0.80
1.00
A2
1.10
1.30
A3
—
0.6
b
0.82
0.93
D
25.00 BSC
D1
—
11.3
D2
8.0
—
D3
—
6.5
D4
9.76
9.96
e
1.27 BSC
E
25.00 BSC
E1
—
11.3
E2
8.0
—
E3
—
6.5
E4
8.41
8.61
Figure 13. Mechanical Dimensions and Bottom Surface Nomenclature for the MPC7447A,
360 HCTE BGA Package
MPC7447A RISC Microprocessor Hardware Specifications, Rev. 5
28
Freescale Semiconductor
Package Description
8.3
Package Parameters for the MPC7447A, 360 HCTE LGA
The package parameters are as provided in the following list. The package type is 25 × 25 mm, 360 high
coefficient of thermal expansion ceramic land grid array (HCTE).
Package outline
Interconnects
Pitch
Minimum module height
Maximum module height
Coefficient of thermal expansion
25 × 25 mm
360 (19 × 19 ball array – 1)
1.27 mm (50 mil)
1.92 mm
2.20 mm
12.3 ppm/°C
MPC7447A RISC Microprocessor Hardware Specifications, Rev. 5
Freescale Semiconductor
29
Package Description
8.4
Mechanical Dimensions for the MPC7447A, 360 HCTE LGA
Figure 14 provides the mechanical dimensions and bottom surface nomenclature for the MPC7447A, 360
HCTE LGA package.
2X
0.2
D
Capacitor Region
B
D1
D3
A1 CORNER
D2
A
1
0.15 A
NOTES:
1. Dimensioning and
tolerancing per ASME
Y14.5M, 1994
2. Dimensions in millimeters.
3. Top side A1 corner index is a
metalized feature with
various shapes. Bottom side
A1 corner is designated with
a pad missing from the array.
E3
E4
E
Millimeters
E2
E1
2X
0.2
D4
C
1 2 3 4 5 6 7 8 9 10 111213141516 171819
W
V
U
T
R
P
N
M
L
K
J
H
G
F
E
D
C
B
A
e
360X
b
0.3 A B C
A2
A1
A
0.35 A
Dim
Min
Max
A
1.92
2.20
A1
1.10
1.30
A2
—
0.6
b
0.82
0.93
D
25.00 BSC
D1
—
11.3
D2
8.0
—
D3
—
6.5
D4
9.76
9.96
e
1.27 BSC
E
25.00 BSC
E1
—
11.3
E2
8.0
—
E3
—
6.5
E4
8.41
8.61
0.15 A
Figure 14. Mechanical Dimensions and Bottom Surface Nomenclature for the MPC7447A,
360 HCTE LGA Package
MPC7447A RISC Microprocessor Hardware Specifications, Rev. 5
30
Freescale Semiconductor
Package Description
8.5
Package Parameters for the MPC7447A, 360 HCTE
RoHS-Compliant BGA
The package parameters are as provided in the following list. The package type is 25 × 25 mm, 360
lead-free high coefficient of thermal expansion ceramic ball grid array (HCTE).
Package outline
Interconnects
Pitch
Minimum module height
Maximum module height
Ball diameter
Coefficient of thermal expansion
25 × 25 mm
360 (19 × 19 ball array – 1)
1.27 mm (50 mil)
2.32 mm
2.80 mm
0.75 mm (30 mil)
12.3 ppm/°C
MPC7447A RISC Microprocessor Hardware Specifications, Rev. 5
Freescale Semiconductor
31
Package Description
8.6
Mechanical Dimensions for the MPC7447A, 360 HCTE
RoHS-Compliant BGA
Figure 15 provides the mechanical dimensions and bottom surface nomenclature for the MPC7447A, 360
HCTE BGA package.
2X
0.2
D
Capacitor Region
B
D1
D3
A1 CORNER
D2
A
1
0.15 A
E3
NOTES:
1. Dimensioning and
tolerancing per ASME
Y14.5M, 1994
2. Dimensions in millimeters.
3. Top side A1 corner index is a
metalized feature with
various shapes. Bottom side
A1 corner is designated with
a ball missing from the array.
4. Dimension A1 represents the
collapsed sphere diameter.
E4
E
Millimeters
E2
E1
2X
Dim
Min
Max
A
2.32
2.80
0.40
0.60
A2
1.10
1.30
A3
—
0.6
b
0.60
0.90
A1
0.2
D4
C
1 2 3 4 5 6 7 8 9 10 111213141516 171819
W
V
U
T
R
P
N
M
L
K
J
H
G
F
E
D
C
B
A
e
360X
b
0.3 A B C
0.15 A
A3
A2
A1
A
0.35 A
4
D
25.00 BSC
D1
—
11.3
D2
8.0
—
D3
—
6.5
D4
9.76
9.96
e
1.27 BSC
E
25.00 BSC
E1
—
11.3
E2
8.0
—
E3
—
6.5
E4
8.41
8.61
Figure 15. Mechanical Dimensions and Bottom Surface Nomenclature for the MPC7447A,
360 HCTE RoHS-Compliant BGA Package
MPC7447A RISC Microprocessor Hardware Specifications, Rev. 5
32
Freescale Semiconductor
Package Description
8.7
Substrate Capacitors for the MPC7447A, 360 HCTE
Figure 16 shows the connectivity of the substrate capacitor pads for the MPC7447A, 360 HCTE. All
capacitors are 100 nF.
Pad Number
Capacitor
A1 CORNER
C1-1
C2-1 C3-1
C4-1
C5-1
C6-1
1
C8-2
C18-2 C17-2 C16-2 C15-2 C14-2 C13-2
C18-1 C17-1 C16-1 C15-1 C14-1 C13-1
C7-1
C6-2
C8-1
C5-2
C12-1 C11-1 C10-1 C9-1
C4-2
C7-2
C2-2 C3-2
C12-2 C11-2 C10-2 C9-2
C19-2 C20-2 C21-2 C22-2 C23-2 C24-2
C19-1 C20-1 C21-1 C22-1 C23-1 C24-1
C1-2
–1
–2
C1
GND
VDD
C2
GND
VDD
C3
GND
OV DD
C4
GND
VDD
C5
GND
VDD
C6
GND
VDD
C7
GND
VDD
C8
GND
VDD
C9
GND
VDD
C10
GND
VDD
C11
GND
VDD
C12
GND
VDD
C13
GND
VDD
C14
GND
VDD
C15
GND
VDD
C16
GND
OV DD
C17
GND
VDD
C18
GND
OV DD
C19
GND
OV DD
C20
GND
VDD
C21
GND
OV DD
C22
GND
VDD
C23
GND
OV DD
C24
GND
VDD
Figure 16. Substrate Bypass Capacitors for the MPC7447A, 360 HCTE
MPC7447A RISC Microprocessor Hardware Specifications, Rev. 5
Freescale Semiconductor
33
System Design Information
9
System Design Information
This section provides system and thermal design recommendations for successful application of the
MPC7447A.
9.1
9.1.1
Clocks
PLL Configuration
The MPC7447A PLL is configured by the PLL_CFG[0:4] signals. For a given SYSCLK (bus) frequency,
the PLL configuration signals set the internal CPU and VCO frequency of operation. The PLL
configuration for the MPC7447A is shown in Table 13 for a set of example frequencies. In this example,
shaded cells represent settings that, for a given SYSCLK frequency, result in core and/or VCO frequencies
that do not comply with the 1400 MHz column in Table 8. When enabled, dynamic frequency switching
(DFS) also affects the core frequency by halving the bus-to-core multiplier; see Section 9.8.5, “Dynamic
Frequency Switching (DFS),” for more information. Note that when DFS is enabled the resulting core
frequency must meet the minimum core frequency requirements described in Table 8.
Table 13. MPC7447A Microprocessor PLL Configuration Example for 1420-MHz Parts
Example Bus-to-Core Frequency in MHz (VCO Frequency in MHz)
PLL_
CFG[0:4]
Bus (SYSCLK) Frequency
Bus-toCore
Multiplier
Core-toVCO
Multiplier
01000
2x 1
2x
10000
3x 1
2x
10100
4x 1
2x
10110
5x
2x
665
(1333)
835
(1670)
10010
5.5x
2x
732
(1466)
919
(1837)
11010
6x
2x
600
(1200)
798
(1600)
1002
(2004)
01010
6.5x
2x
650
(1300)
865
(1730)
1086
(2171)
00100
7x
2x
700
(1400)
931
(1862)
1169
(2338)
00010
7.5x
2x
623
(1245)
750
(1500)
998
(2000)
1253
(2505)
11000
8x
2x
664
(1328)
800
(1600)
1064
(2128)
1336
(2672)
33
MHz
50
MHz
67
MHz
75
MHz
83
MHz
100
MHz
133
MHz
167
MHz
668
(1333)
600
(1200)
MPC7447A RISC Microprocessor Hardware Specifications, Rev. 5
34
Freescale Semiconductor
System Design Information
Table 13. MPC7447A Microprocessor PLL Configuration Example for 1420-MHz Parts (continued)
Example Bus-to-Core Frequency in MHz (VCO Frequency in MHz)
PLL_
CFG[0:4]
Bus-toCore
Multiplier
Core-toVCO
Multiplier
01100
8.5x
2x
01111
9x
2x
01110
9.5x
10101
Bus (SYSCLK) Frequency
33
MHz
50
MHz
67
MHz
75
MHz
83
MHz
100
MHz
133
MHz
167
MHz
638
(1276)
706
(1412)
850
(1700)
1131
(2261)
1420
(2833)
603
(1200)
675
(1350)
747
(1494)
900
(1800)
1197
(2394)
2x
637
(1266)
713
(1524)
789
(1578)
950
(1900)
1264
(2528)
10x
2x
670
(1333)
750
(1500)
830
(1660)
1000
(2000)
1330
(2667)
10001
10.5x
2x
704
(1400)
788
(1876)
872
(1744)
1050
(2100)
1397
(2793)
10011
11x
2x
737
(1466)
825
(1650)
913
(1826)
1100
(2200)
00000
11.5x
2x
771
(532)
863
(1726)
955
(1910)
1150
(2300)
10111
12x
2x
600
(1200)
804
(1600)
900
(1800)
996
(1992)
1200
(2400)
11111
12.5x
2x
625
(1200)
838
(1666)
938
(1876)
1038
(2076)
1250
(2500)
01011
13x
2x
650
(1300)
871
(1730)
975
(1950)
1079
(2158)
1300
(2600)
11100
13.5x
2x
675
(1350)
905
(1800)
1013
(2026)
1121
(2242)
1350
(2700)
11001
14x
2x
700
(1400)
938
(1866)
1050
(2100)
1162
(2324)
1400
(2800)
00011
15x
2x
750
(1500)
1005
(2000)
1125
(2250)
1245
(2490)
11011
16x
2x
800
(1600)
1072
(2132)
1200
(2400)
1328
(2656)
00001
17x
2x
850
(1900)
1139
(2264)
1275
(2550)
1411
(2822)
00101
18x
2x
900
(1800)
1206
(2400)
1350
(2700)
00111
20x
2x
660
(1334)
1000
(2000)
1340
(2664)
01001
21x
2x
693
(1400)
1050
(2100)
1407
(2797)
MPC7447A RISC Microprocessor Hardware Specifications, Rev. 5
Freescale Semiconductor
35
System Design Information
Table 13. MPC7447A Microprocessor PLL Configuration Example for 1420-MHz Parts (continued)
Example Bus-to-Core Frequency in MHz (VCO Frequency in MHz)
PLL_
CFG[0:4]
Bus-toCore
Multiplier
Core-toVCO
Multiplier
01101
24x
11101
28x
Bus (SYSCLK) Frequency
33
MHz
50
MHz
2x
792
(1600)
1200
(2400)
2x
924
(1866)
1400
(2800)
00110
PLL bypass
11110
PLL off
67
MHz
75
MHz
83
MHz
100
MHz
133
MHz
167
MHz
PLL off, SYSCLK clocks core circuitry directly
PLL off, no core clocking occurs
Notes:
1. Ratios below 5:1 require an AACK delay See MPC7450 RISC Microprocessor Family Reference Manual, Section
9.3.3, “MPX Bus Address Tenure Termination.”
2. The sample bus-to-core frequencies shown are for reference only. Some PLL configurations may select bus, core,
or VCO frequencies that are not useful, not supported, or not tested for by the MPC7455; see Section 5.2.1, “Clock
AC Specifications,” for valid SYSCLK, core, and VCO frequencies.
3. In PLL-bypass mode, the SYSCLK input signal clocks the internal processor directly and the PLL is disabled.
However, the bus interface unit requires a 2x clock to function. Therefore, an additional signal, EXT_QUAL, must be
driven at one-half the frequency of SYSCLK and offset in phase to meet the required input setup tIVKH and hold time
tIXKH (see Table 9). The result will be that the processor bus frequency will be one-half SYSCLK while the internal
processor is clocked at SYSCLK frequency. This mode is intended for factory use and emulator tool use only.
Note: The AC timing specifications given in this document do not apply in PLL-bypass mode.
4. In PLL-off mode, no clocking occurs inside the MPC7447A regardless of the SYSCLK input.
9.1.2
System Bus Clock (SYSCLK) and Spread Spectrum Sources
Spread spectrum clock sources are an increasingly popular way to control electromagnetic interference
emissions (EMI) by spreading the emitted noise to a wider spectrum and reducing the peak noise
magnitude in order to meet industry and government requirements. These clock sources intentionally add
long-term jitter in order to diffuse the EMI spectral content. The jitter specification given in Table 8
considers short-term (cycle-to-cycle) jitter only and the clock generator’s cycle-to-cycle output jitter
should meet the MPC7457 input cycle-to-cycle jitter requirement. Frequency modulation and spread are
separate concerns, and the MPC7457 is compatible with spread spectrum sources if the recommendations
listed in Table 14 are observed.
MPC7447A RISC Microprocessor Hardware Specifications, Rev. 5
36
Freescale Semiconductor
System Design Information
Table 14. Spread Specturm Clock Source Recommendations
At recommended operating conditions. See Table 4.
Parameter
Min
Max
Unit
Notes
Frequency modulation
—
50
kHz
1
Frequency spread
—
1.0
%
1, 2
Notes:
1. Guaranteed by design.
2. SYSCLK frequencies resulting from frequency spreading, and the resulting core and VCO
frequencies, must meet the minimum and maximum specifications given in Table 8.
It is imperative to note that the processor’s minimum and maximum SYSCLK, core, and VCO frequencies
must not be exceeded regardless of the type of clock source. Therefore, systems in which the processor is
operated at its maximum rated core or bus frequency should avoid violating the stated limits by using
down-spreading only.
9.2
PLL Power Supply Filtering
The AVDD power signal is provided on the MPC7447A to provide power to the clock generation PLL. To
ensure stability of the internal clock, the power supplied to the AVDD input signal should be filtered of any
noise in the 500-KHz to 10-MHz resonant frequency range of the PLL. A circuit similar to the one shown
in Figure 17 using surface-mount capacitors with minimum effective series inductance (ESL) is
recommended.
The circuit should be placed as close as possible to the AVDD pin to minimize noise coupled from nearby
circuits. It is often possible to route directly from the capacitors to the AVDD pin, which is on the periphery
of the 360 HCTE footprint.
10 Ω
VDD
AVDD
2.2 µF
2.2 µF
Low ESL Surface Mount Capacitors
GND
Figure 17. PLL Power Supply Filter Circuit
9.3
Decoupling Recommendations
Due to the MPC7447A dynamic power management feature, large address and data buses, and high
operating frequencies, the MPC7447A can generate transient power surges and high frequency noise in its
power supply, especially while driving large capacitive loads. This noise must be prevented from reaching
other components in the MPC7447A system, and the MPC7447A itself requires a clean, tightly regulated
source of power. Therefore, it is recommended that the system designer use sufficient decoupling
capacitors, typically one capacitor for every 1–2 VDD pins, and a similar or lesser number for the OVDD
pins, placed as close as possible to the power pins of the MPC7447A. It is also recommended that these
decoupling capacitors receive their power from separate VDD, OVDD, and GND power planes in the PCB,
utilizing short traces to minimize inductance.
MPC7447A RISC Microprocessor Hardware Specifications, Rev. 5
Freescale Semiconductor
37
System Design Information
These capacitors should have a value of 0.01 or 0.1 µF. Only ceramic surface mount technology (SMT)
capacitors should be used to minimize lead inductance. Orientations where connections are made along
the length of the part, such as 0204, are preferable but not mandatory. Consistent with the
recommendations of Dr. Howard Johnson in High Speed Digital Design: A Handbook of Black Magic
(Prentice Hall, 1993) and contrary to previous recommendations for decoupling Freescale
microprocessors, multiple small capacitors of equal value are recommended over using multiple values of
capacitance.
In addition, it is recommended that there be several bulk storage capacitors distributed around the PCB,
feeding the VDD and OVDD planes, to enable quick recharging of the smaller chip capacitors. These bulk
capacitors should have a low equivalent series resistance (ESR) rating to ensure the quick response time
necessary. They should also be connected to the power and ground planes through two vias to minimize
inductance. Suggested bulk capacitors are: 100–330 µF (AVX TPS tantalum or Sanyo OSCON).
9.4
Connection Recommendations
To ensure reliable operation, it is highly recommended to connect unused inputs to an appropriate signal
level. Unless otherwise noted, unused active-low inputs should be tied to OVDD, and unused active-high
inputs should be connected to GND. All NC (no connect) signals must remain unconnected.
Power and ground connections must be made to all external VDD, OVDD, and GND pins in the
MPC7447A. For backward compatibility with the MPC7447, MPC7445, and MP7441, or for migrating a
system originally designed for one of these devices to the MPC7447A, the new power and ground signals
(formerly NC, see Table 12) may be left unconnected. There is no performance degradation associated
with leaving these pins unconnected. However, future devices may require these additional power and
ground signals to be connected to achieve maximum performance, and it is recommended that new designs
include the additional connections to facilitate future upgrades. See also Section 7, “Pinout Listings,” for
additional information.
9.5
Output Buffer DC Impedance
The MPC7447A processor bus drivers are characterized over process, voltage, and temperature. To
measure Z0, an external resistor is connected from the chip pad to OVDD or GND. The value of each
resistor is varied until the pad voltage is OVDD/2. Figure 18 shows the driver impedance measurement.
The output impedance is the average of two components—the resistances of the pull-up and pull-down
devices. When data is held low, SW2 is closed (SW1 is open), and RN is trimmed until the voltage at the
pad equals OVDD/2. RN then becomes the resistance of the pull-down devices. When data is held high,
SW1 is closed (SW2 is open), and RP is trimmed until the voltage at the pad equals OVDD/2. RP then
becomes the resistance of the pull-up devices. RP and RN are designed to be close to each other in value.
Then, Z0 = (RP + RN)/2.
MPC7447A RISC Microprocessor Hardware Specifications, Rev. 5
38
Freescale Semiconductor
System Design Information
OVDD
RN
SW2
Data
Pad
SW1
RP
OGND
Figure 18. Driver Impedance Measurement
Table 15 summarizes the signal impedance results. The impedance increases with junction temperature
and is relatively unaffected by bus voltage.
Table 15. Impedance Characteristics
VDD = 1.5 V, OVDD = 1.8 V ± 5%, Tj = 5°–85°C
Impedance
Z0
9.6
Processor Bus
Unit
Typical
33–42
Ω
Maximum
31–51
Ω
Pull-Up/Pull-Down Resistor Requirements
The MPC7447A requires high-resistive (weak: 4.7 KΩ) pull-up resistors on several control pins of the bus
interface to maintain the control signals in the negated state after they have been actively negated and
released by the MPC7447A or other bus masters. These pins are: TS, ARTRY, SHDO, and SHD1.
Some pins designated as being factory test pins must be pulled up to OVDD or down to GND to ensure
proper device operation. The pins that must be pulled up to OVDD are: LSSD_MODE and TEST[0:3]; the
pins that must be pulled down to GND are: L1_TSTCLK and TEST[4]. The CKSTP_IN signal should
likewise be pulled up through a pull-up resistor (weak or stronger: 4.7 KΩ–1 KΩ) to prevent erroneous
assertions of this signal.
In addition, the MPC7447A has one open-drain style output that requires a pull-up resistor (weak or
stronger: 4.7 KΩ–1 KΩ) if it is used by the system. This pin is CKSTP_OUT.
If pull-down resistors are used to configure BVSEL, the resistors should be less than 250 Ω (see Table 12).
Because PLL_CFG[0:4] must remain stable during normal operation, strong pull-up and pull-down
resistors (1 KΩ or less) are recommended to configure these signals in order to protect against erroneous
switching due to ground bounce, power supply noise or noise coupling.
MPC7447A RISC Microprocessor Hardware Specifications, Rev. 5
Freescale Semiconductor
39
System Design Information
During inactive periods on the bus, the address and transfer attributes may not be driven by any master and
may, therefore, float in the high-impedance state for relatively long periods of time. Because the
MPC7447A must continually monitor these signals for snooping, this float condition may cause excessive
power draw by the input receivers on the MPC7447A or by other receivers in the system. These signals
can be pulled up through weak (10-KΩ) pull-up resistors by the system, address bus driven mode enabled
(see the MPC7450 RISC Microprocessor Family Users’ Manual for more information on this mode), or
they may be otherwise driven by the system during inactive periods of the bus to avoid this additional
power draw. Preliminary studies have shown the additional power draw by the MPC7447A input receivers
to be negligible and, in any event, none of these measures are necessary for proper device operation. The
snooped address and transfer attribute inputs are: A[0:35], AP[0:4], TT[0:4], CI, WT, and GBL.
If address or data parity is not used by the system, and respective parity checking is disabled through HID1,
the input receivers for those pins are disabled and do not require pull-up resistors, and may be left
unconnected by the system. If extended addressing is not used (HID0[XAEN] = 0), A[0:3] are unused and
must be pulled low to GND through weak pull-down resistors; additionally, if address parity checking is
enabled (HID1[EBA] = 1) and extended addressing is not used, AP[0] must be pulled up to OVDD through
a weak pull-up resistor. If the MPC7447A is in 60x bus mode, DTI[0:3] must be pulled low to GND
through weak pull-down resistors.
The data bus input receivers are normally turned off when no read operation is in progress and, therefore,
do not require pull-up resistors on the bus. Other data bus receivers in the system, however, may require
pull-ups, or that those signals be otherwise driven by the system during inactive periods. The data bus
signals are: D[0:63] and DP[0:7].
9.7
JTAG Configuration Signals
Boundary-scan testing is enabled through the JTAG interface signals. The TRST signal is optional in the
IEEE 1149.1 specification but is provided on all processors that implement the PowerPC architecture.
While it is possible to force the TAP controller to the reset state using only the TCK and TMS signals, more
reliable power-on reset performance will be obtained if the TRST signal is asserted during power-on reset.
Because the JTAG interface is also used for accessing the common on-chip processor (COP) function,
simply tying TRST to HRESET is not practical.
The COP function of these processors allows a remote computer system (typically a PC with dedicated
hardware and debugging software) to access and control the internal operations of the processor. The COP
interface connects primarily through the JTAG port of the processor, with some additional status
monitoring signals. The COP port requires the ability to independently assert HRESET or TRST in order
to fully control the processor. If the target system has independent reset sources, such as voltage monitors,
watchdog timers, power supply failures, or push-button switches, then the COP reset signals must be
merged into these signals with logic.
The arrangement shown in Figure 19 allows the COP port to independently assert HRESET or TRST,
while ensuring that the target can drive HRESET as well. If the JTAG interface and COP header will not
be used, TRST should be tied to HRESET through a 0-Ω isolation resistor so that it is asserted when the
system reset signal (HRESET) is asserted, ensuring that the JTAG scan chain is initialized during
power-on. Although Freescale recommends that the COP header be designed into the system as shown in
Figure 19, if this is not possible, the isolation resistor will allow future access to TRST in the case where
a JTAG interface may need to be wired onto the system in debug situations.
MPC7447A RISC Microprocessor Hardware Specifications, Rev. 5
40
Freescale Semiconductor
System Design Information
The COP header shown in Figure 19 adds many benefits—breakpoints, watchpoints, register and memory
examination/modification, and other standard debugger features are possible through this interface—and
can be as inexpensive as an unpopulated footprint for a header to be added when needed.
The COP interface has a standard header for connection to the target system, based on the 0.025"
square-post, 0.100" centered header assembly (often called a Berg header). The connector typically has
pin 14 removed as a connector key.
There is no standardized way to number the COP header shown in Figure 19; consequently, many different
pin numbers have been observed from emulator vendors. Some are numbered top-to-bottom then
left-to-right, while others use left-to-right then top-to-bottom, while still others number the pins counter
clockwise from pin 1 (as with an IC). Regardless of the numbering, the signal placement recommended in
Figure 19 is common to all known emulators.
The QACK signal shown in Figure 19 is usually connected to the PCI bridge chip in a system and is an
input to the MPC7447A informing it that it can go into the quiescent state. Under normal operation this
occurs during a low-power mode selection. In order for COP to work, the MPC7447A must see this signal
asserted (pulled down). While shown on the COP header, not all emulator products drive this signal. If the
product does not, a pull-down resistor can be populated to assert this signal. Additionally, some emulator
products implement open-drain type outputs and can only drive QACK asserted; for these tools, a pull-up
resistor can be implemented to ensure this signal is negated when it is not being driven by the tool. Note
that the pull-up and pull-down resistors on the QACK signal are mutually exclusive and it is never
necessary to populate both in a system. To preserve correct power-down operation, QACK should be
merged through logic so that it also can be driven by the PCI bridge.
MPC7447A RISC Microprocessor Hardware Specifications, Rev. 5
Freescale Semiconductor
41
System Design Information
From Target
Board Sources
(if any)
SRESET
SRESET
HRESET
HRESET 6
QACK
13
11
HRESET
10 KΩ
SRESET
10 KΩ
OVDD
OVDD
10 KΩ
OVDD
10 KΩ
OVDD
0Ω5
1
2
3
4
5
6
7
8
9
10
11
12
6
5
10 KΩ
OVDD
OVDD
CHKSTP_OUT
CHKSTP_OUT
Key
14 2
10 KΩ
OVDD
OVDD
CHKSTP_IN
COP Header
COP Connector
Physical Pin Out
2 KΩ
10 KΩ
KEY
16
VDD_SENSE
1
15
13 No Pin
15
TRST 6
TRST
4
CHKSTP_IN
8
TMS
9
1
3
TMS
TDO
TDO
TDI
TDI
TCK
7
2
10
12
16
TCK
QACK
QACK
NC
NC
2 KΩ 3
OV DD
10 KΩ
10 KΩ 4
OV DD
Notes:
1. RUN/STOP, normally found on pin 5 of the COP header, is not implemented on the MPC7447A. Connect
pin 5 of the COP header to OV DD with a 10-KΩ pull-up resistor.
2. Key location; pin 14 is not physically present on the COP header.
3. Component not populated. Populate only if debug tool does not drive QACK.
4. Populate only if debug tool uses an open-drain type output and does not actively negate QACK.
5. If the JTAG interface is implemented, connect HRESET from the target source to TRST from the COP
header though an AND gate to TRST of the part. If the JTAG interface is not implemented, connect
HRESET from the target source to TRST of the part through a 0-Ω isolation resistor.
6. The COP port and target board should be able to independently assert HRESET and TRST to the
processor in order to fully control the processor as shown above.
Figure 19. JTAG Interface Connection
MPC7447A RISC Microprocessor Hardware Specifications, Rev. 5
42
Freescale Semiconductor
System Design Information
9.8
Thermal Management Information
This section provides thermal management information for the high coefficient of thermal expansion
(HCTE) package for air-cooled applications. Proper thermal control design is primarily dependent on the
system-level design—the heat sink, airflow, and thermal interface material. The MPC7447A implements
several features designed to assist with thermal management, including DFS and the temperature diode.
DFS reduces the power consumption of the device by reducing the core frequency; see Section 9.8.5.1,
“Power Consumption with DFS Enabled,” for specific information regarding power reduction and DFS.
The temperature diode allows an external device to monitor the die temperature in order to detect excessive
temperature conditions and alert the system; see Section 9.8.4, “Temperature Diode,” for more
information.
To reduce the die-junction temperature, heat sinks may be attached to the package by several
methods—spring clip to holes in the printed-circuit board or package, and mounting clip and screw
assembly (see Figure 20 and Figure 21); however, due to the potential large mass of the heat sink,
attachment through the printed-circuit board is suggested. In any implementation of a heat sink solution,
the force on the die should not exceed ten pounds.
Heat Sink
HCTE BGA Package
Heat Sink
Clip
Thermal
Interface Material
Printed-Circuit Board
Figure 20. BGA Package Exploded Cross-Sectional View with Several Heat Sink Options
NOTE
A clip on heat sink is not recommended for LGA because there may not be
adequate clearance between the device and the circuit board. A through-hole
solution is recommended, as shown in Figure 21 below.
MPC7447A RISC Microprocessor Hardware Specifications, Rev. 5
Freescale Semiconductor
43
System Design Information
Heat Sink
HCTE LGA Package
Heat Sink
Clip
Thermal
Interface Material
Printed-Circuit Board
Figure 21. LGA Package Exploded Cross-Sectional View with Several Heat Sink Options
The board designer can choose between several types of heat sinks to place on the MPC7447A. There are
several commercially-available heat sinks for the MPC7447A provided by the following vendors:
Aavid Thermalloy
80 Commercial St.
Concord, NH 03301
Internet: www.aavidthermalloy.com
603-224-9988
Alpha Novatech
473 Sapena Ct. #12
Santa Clara, CA 95054
Internet: www.alphanovatech.com
408-567-8082
Calgreg Thermal Solutions
60 Alhambra Road
Warwick, RI 02886
Internet: www.calgregthermalsolutions.com
401-732-8100
International Electronic Research Corporation (IERC)
413 North Moss St.
Burbank, CA 91502
Internet: www.ctscorp.com
818-842-7277
Tyco Electronics
Chip Coolers™
P.O. Box 3608
Harrisburg, PA 17105-3608
Internet: www.chipcoolers.com
717-564-0100
Wakefield Engineering
33 Bridge St.
Pelham, NH 03076
Internet: www.wakefield.com
603-635-2800
Ultimately, the final selection of an appropriate heat sink depends on many factors, such as thermal
performance at a given air velocity, spatial volume, mass, attachment method, assembly, and cost.
MPC7447A RISC Microprocessor Hardware Specifications, Rev. 5
44
Freescale Semiconductor
System Design Information
9.8.1
Internal Package Conduction Resistance
For the exposed-die packaging technology described in Table 5, the intrinsic conduction thermal resistance
paths are as follows:
• The die junction-to-case thermal resistance (the case is actually the top of the exposed silicon die)
•
The die junction-to-board thermal resistance
Figure 22 depicts the primary heat transfer path for a package with an attached heat sink mounted to a
printed-circuit board.
External Resistance
Radiation
Convection
Heat Sink
Thermal Interface Material
Die/Package
Die Junction
Package/Leads
Internal Resistance
Printed-Circuit Board
External Resistance
Radiation
Convection
(Note the internal versus external package resistance.)
Figure 22. C4 Package with Heat Sink Mounted to a Printed-Circuit Board
Heat generated on the active side of the chip is conducted through the silicon, through the heat sink attach
material (or thermal interface material), and finally to the heat sink where it is removed by forced-air
convection.
Because the silicon thermal resistance is quite small, the temperature drop in the silicon may be neglected
for a first-order analysis. Thus the thermal interface material and the heat sink conduction/convective
thermal resistances are the dominant terms.
9.8.2
Thermal Interface Materials
A thermal interface material is recommended at the package lid-to-heat sink interface to minimize the
thermal contact resistance. For those applications where the heat sink is attached by spring clip
mechanism, Figure 23 shows the thermal performance of three thin-sheet thermal interface materials
(silicone, graphite/oil, fluoroether oil), a bare joint, and a joint with thermal grease as a function of contact
pressure. As shown, the performance of these thermal interface materials improves with increasing contact
pressure. The use of thermal grease significantly reduces the interface thermal resistance. That is, the bare
joint results in a thermal resistance approximately seven times greater than the thermal grease joint.
Often, heat sinks are attached to the package by means of a spring clip to holes in the printed-circuit board
(see Figure 20). Therefore, synthetic grease offers the best thermal performance, considering the low
interface pressure, and is recommended due to the high power dissipation of the MPC7447A. Of course,
MPC7447A RISC Microprocessor Hardware Specifications, Rev. 5
Freescale Semiconductor
45
System Design Information
the selection of any thermal interface material depends on many factors—thermal performance
requirements, manufacturability, service temperature, dielectric properties, cost, and so on.
Silicone Sheet (0.006 in.)
Bare Joint
Fluoroether Oil Sheet (0.007 in.)
Graphite/Oil Sheet (0.005 in.)
Synthetic Grease
Specific Thermal Resistance (K-in.2/W)
2
1.5
1
0.5
0
0
10
20
30
40
50
60
70
80
Contact Pressure (psi)
Figure 23. Thermal Performance of Select Thermal Interface Material
The board designer can choose between several types of thermal interface. Heat sink adhesive materials
should be selected based on high conductivity and mechanical strength to meet equipment shock/vibration
requirements. There are several commercially available thermal interfaces and adhesive materials
provided by the following vendors:
The Bergquist Company
18930 West 78th St.
Chanhassen, MN 55317
Internet: www.bergquistcompany.com
800-347-4572
Chomerics, Inc.
77 Dragon Ct.
Woburn, MA 01801
Internet: www.chomerics.com
781-935-4850
Dow-Corning Corporation
Dow-Corning Electronic Materials
2200 W. Salzburg Rd.
Midland, MI 48686-0997
Internet: www.dowcorning.com
800-248-2481
MPC7447A RISC Microprocessor Hardware Specifications, Rev. 5
46
Freescale Semiconductor
System Design Information
Shin-Etsu MicroSi, Inc.
10028 S. 51st St.
Phoenix, AZ 85044
Internet: www.microsi.com
888-642-7674
Thermagon Inc.
4707 Detroit Ave.
Cleveland, OH 44102
Internet: www.thermagon.com
888-246-9050
The following section provides a heat sink selection example using one of the commercially available heat
sinks.
9.8.3
Heat Sink Selection Example
For preliminary heat sink sizing, the die-junction temperature can be expressed as follows:
Tj = Ti + Tr + (RθJC + Rθint + Rθsa) × Pd
where:
Tj is the die-junction temperature
Ti is the inlet cabinet ambient temperature
Tr is the air temperature rise within the computer cabinet
RθJC is the junction-to-case thermal resistance
Rθint is the adhesive or interface material thermal resistance
Rθsa is the heat sink base-to-ambient thermal resistance
Pd is the power dissipated by the device
During operation, the die-junction temperatures (Tj) should be maintained less than the value specified in
Table 4. The temperature of air cooling the component greatly depends on the ambient inlet air temperature
and the air temperature rise within the electronic cabinet. An electronic cabinet inlet-air temperature (Ti)
may range from 30° to 40°C. The air temperature rise within a cabinet (Tr) may be in the range of 5° to
10°C. The thermal resistance of the thermal interface material (Rθint) is typically about 1.5°C/W. For
example, assuming a Ti of 30°C, a Tr of 5°C, an HCTE package RθJC = 0.1, and a typical power
consumption (Pd) of 18.7 W, the following expression for Tj is obtained:
Die-junction temperature: Tj = 30°C + 5°C + (0.1°C/W + 1.5°C/W + Rθsa) × 18.7 W
For this example, a Rθsavalue of 2.1°C/W or less is required to maintain the die junction temperature below
the maximum value of Table 4.
Though the die-junction-to-ambient and the heat-sink-to-ambient thermal resistances are a common
figure-of-merit used for comparing the thermal performance of various microelectronic packaging
technologies, one should exercise caution when only using this metric in determining thermal management
because no single parameter can adequately describe three-dimensional heat flow. The final die-junction
operating temperature is not only a function of the component-level thermal resistance, but the
system-level design and its operating conditions. In addition to the component's power consumption, a
number of factors affect the final operating die-junction temperature—airflow, board population (local
MPC7447A RISC Microprocessor Hardware Specifications, Rev. 5
Freescale Semiconductor
47
System Design Information
heat flux of adjacent components), heat sink efficiency, heat sink attach, heat sink placement, next-level
interconnect technology, system air temperature rise, altitude, and so on.
Due to the complexity and variety of system-level boundary conditions for today's microelectronic
equipment, the combined effects of the heat transfer mechanisms (radiation, convection, and conduction)
may vary widely. For these reasons, we recommend using conjugate heat transfer models for the board, as
well as system-level designs.
For system thermal modeling, the MPC7447A thermal model is shown in Figure 24. Four volumes
represent this device. Two of the volumes, solder ball-air and substrate, are modeled using the package
outline size of the package. The other two, die and bump-underfill, have the same size as the die. The
silicon die should be modeled 8.5 × 9.9 × 0.7 mm3 with the heat source applied as a uniform source at the
bottom of the volume. The bump and underfill layer is modeled as 8.5 × 9.9 × 0.07 mm3 (or as a collapsed
volume) with orthotropic material properties: 0.6 W/(m • K) in the xy-plane and 1.9 W/(m • K) in the
direction of the z-axis. The substrate volume is 25 × 25 × 1.2 mm3, and has 8.1 W/(m • K) isotropic
conductivity in the xy-plane and 4 W/(m • K) in the direction of the z-axis. The solder ball and air layer
are modeled with the same horizontal dimensions as the substrate and are 0.6 mm thick. They can also be
modeled as a collapsed volume using orthotropic material properties: 0.034 W/(m • K) in the xy-plane
direction and 3.8 W/(m • K) in the direction of the z-axis.
Conductivity
Value
Unit
Die
3
Bump and Underfill (8.5 × 9.9 × 0.07 mm )
Bump and Underfill
z
kx
0.6
ky
0.6
kz
1.9
W/(m • K)
Substrate
Solder and Air
Side View of Model (Not to Scale)
3
Substrate (25 × 25 × 1.2 mm )
kx
8.1
ky
8.1
kz
4.0
x
Substrate
Solder Ball and Air (25 × 25 × 0.6 mm3)
kx
0.034
ky
0.034
kz
3.8
Die
y
Top View of Model (Not to Scale)
Figure 24. Recommended Thermal Model of MPC7447A
MPC7447A RISC Microprocessor Hardware Specifications, Rev. 5
48
Freescale Semiconductor
System Design Information
9.8.4
Temperature Diode
The MPC7447A has a temperature diode on the microprocessor that can be used in conjunction with other
system temperature monitoring devices (such as Analog Devices, ADT7461™). These devices use the
negative temperature coefficient of a diode operated at a constant current to determine the temperature of
the microprocessor and its environment. For proper operation, the monitoring device used should
auto-calibrate the device by canceling out the VBE variation of each MPC7447A’s internal diode.
The following are the specifications of the MPC7447A on-board temperature diode:
0.40 V <Vf <0.90 V
Operating range 2–300 μA
Diode leakage < 10 nA @ 125 C
Ideality factor (n) over 5–150 μA @ 60 C: 1.0275 ± 0.9 %
Ideality factor is defined as the deviation from the ideal diode equation:
qVf
___
Ifw = Is e nKT – 1
Where:
Ifw = Forward current
Is = Saturation current
V d = Voltage at diode BM: this does not show up in any equations.
V f = Voltage forward biased
q = Charge of electron (1.6 x 10 -19 C)
n = Ideality factor (normally 1.0)
K = Boltzman’s constant (1.38 x 10-23 Joules/K)
T = Temperature (Kelvins)
Another useful equation is :
KT
IH
VH – VL = n__ ln __
q
IL
Where:
V H = Diode voltage while IH is flowing
V L = Diode voltage while IL is flowing
IH = Larger diode bias current
IL = Smaller diode bias current
MPC7447A RISC Microprocessor Hardware Specifications, Rev. 5
Freescale Semiconductor
49
System Design Information
The ratio of IH to IL is usually selected to be 10:1. The above simplifies to the following:
VH – VL = 1.986 × 10-4 × nT
Solving for T, the equation becomes:
nT =
9.8.5
VH – VL
__________
1.986 × 10-4
Dynamic Frequency Switching (DFS)
The new DFS feature in the MPC7447A adds the ability to divide the processor-to-system bus ratio by two
during normal functional operation by setting the HID1[DFS2] bit. The frequency change occurs in 1 clock
cycle, and no idle waiting period is required to switch between modes. Additional information regarding
DFS can be found in the MPC7450 RISC Microprocessor Family Reference Manual.
9.8.5.1
Power Consumption with DFS Enabled
Power consumption with DFS enabled can be approximated using the following formula:
fDFS
PDFS = ___
(P – PDS) + PDS
f
Where:
PDFS = Power consumption with DFS enabled
fDFS = Core frequency with DFS enabled
f = Core frequency prior to enabling DFS
P = Power consumption prior to enabling DFS (see Table 7)
PDS = Deep sleep mode power consumption (see Table 7)
The above is an approximation only. Power consumption with DFS enabled is not tested or guaranteed.
9.8.5.2
Bus-to-Core Multiplier Constraints with DFS
DFS is not available for all bus-to-core multipliers as configured by PLL_CFG[0:4] during hard reset.
Specifically, because the MPC7447A does not support quarter clock ratios or the 1x multiplier, the DFS
feature is limited to integer PLL multipliers of 4x and higher. The complete listing is shown in Table 16.
Table 16. Valid Divide Ratio Configurations
Bus-to-Core Multiplier Configured
by PLL_CFG[0:4]
(see Table 13)
Bus-to-Core Multiplier with
HID1[DFS1] = 1
(÷2)
2x
N/A
3x
N/A
MPC7447A RISC Microprocessor Hardware Specifications, Rev. 5
50
Freescale Semiconductor
System Design Information
Table 16. Valid Divide Ratio Configurations (continued)
9.8.5.3
Bus-to-Core Multiplier Configured
by PLL_CFG[0:4]
(see Table 13)
Bus-to-Core Multiplier with
HID1[DFS1] = 1
(÷2)
4x
2x
5x
2.5x
5.5x
N/A
6x
3x
6.5x
N/A
7x
3.5x
7.5x
N/A
8x
4x
8.5x
N/A
9x
4.5x
9.5x
N/A
10x
5x
10.5x
N/A
11x
5.5x
11.5x
N/A
12x
6x
12.5x
N/A
13x
6.5x
13.5x
N/A
14x
7x
15x
7.5x
16x
8x
17x
8.5x
18x
9x
20x
10x
21x
10.5x
24x
12x
28x
14x
Minimum Core Frequency Requirements with DFS
In many systems, enabling DFS can result in very low processor core frequencies. However, care must be
taken to ensure that the resulting processor core frequency is within the limits specified in Table 8. Proper
operation of the device is not guaranteed at core frequencies below the specified minimum fcore.
MPC7447A RISC Microprocessor Hardware Specifications, Rev. 5
Freescale Semiconductor
51
Document Revision History
10 Document Revision History
Table 17 provides a revision history for this hardware specification.
Table 17. Document Revision History
Revision
Number
Date
Substantive Changes
5
01/30/2005 Corrected RoHS BGA sphere diameter dimensions
4
09/23/2005 Added RoHS BGA case outlines and part numbers.
Removed note references for CI and WT in Table 12
3
08/23/2005 Added “Section 9.1.2, “System Bus Clock (SYSCLK) and Spread Spectrum Sources”
Section 9.8, “Thermal Management Information”: Added vendor to list
Section 9.8.3, “Heat Sink Selection Example”: Correct silicon die and underfil/bump model dimensions
2
02/16/2005 Changed die size
Table 8: Modified jitter specifications to conform to JEDEC standards, changed jitter specification to
cycle-to-cycle jitter (instead of long- and short-term jitter); changed jitter bandwidth recommendations.
Added information for LGA package.
1
—
Added tKHTSV, tKHARV, tKHTSX, and tKHARX to Table 9; these were previously grouped with tKHOV and
tKHOX. NOTE: Documentation change only; the values for the output valid and output hold AC timing
specifications remain unchanged for TS, ARTRY, and SHD[0:1].
Added derating section with table; added 1000 MHz speed bin
0.1
—
Retitled Table 19 to include document order information for MC7447AnnnnNx series hardware
specification addendum.
0
—
Initial revision.
11 Ordering Information
Ordering information for the parts fully covered by this specification document is provided in
Section 11.1, “Part Numbers Fully Addressed by This Document.” Note that the individual part numbers
correspond to a maximum processor core frequency. For available frequencies, contact a local Freescale
sales office. In addition to the processor frequency, the part numbering scheme also includes an application
modifier that may specify special application conditions. Each part number also contains a revision level
code that refers to the die mask revision number. Section 11.2, “Part Numbers Not Fully Addressed by This
Document,” lists the part numbers that do not fully conform to the specifications of this document. These
special part numbers require an additional document called a hardware specification addendum.
MPC7447A RISC Microprocessor Hardware Specifications, Rev. 5
52
Freescale Semiconductor
Ordering Information
11.1
Part Numbers Fully Addressed by This Document
Table 18 provides the Freescale part numbering nomenclature for the MPC7447A.
Table 18. Part Numbering Nomenclature
MC
7447A
xx
nnnn
L
x
Product
Code
Part
Identifier
Package
Processor
Frequency
Application
Modifier
Revision Level
MC
7447A
11.2
HX = HCTE BGA
VS = RoHS LGA
VU = RoHS BGA
1000
1267
1333
1420
L: 1.3 V ± 50 mV
0 to 105°C
B: 1.1:PVR = 8003 0101
Part Numbers Not Fully Addressed by This Document
Parts with application modifiers or revision levels not fully addressed in this specification document are
described in separate hardware specification addenda which supplement and supersede this document. As
such parts are released, these specifications will be listed in this section.
Table 19. Part Numbers Addressed by MC7447Axxnnnn Nx Series Hardware Specification Addendum
(Document Order No. MPC7447AECS01AD)
MC
7447A
xx
nnnn
N
x
Product
Code
Part
Identifier
Package
Processor
Frequency
Application Modifier
Revision Level
MC
7447A
HX = HCTE BGA
VS = RoHS LGA
VU = RoHS BGA
600
733
867
1000
1167
N: 1.1 V ± 50 mV
0 to 105°C
B:1.1: PVR = 8003 0101
MPC7447A RISC Microprocessor Hardware Specifications, Rev. 5
Freescale Semiconductor
53
Ordering Information
Table 20. Part Numbers Addressed by MC7447ATxxnnnn N x Series Hardware Specification Addendum
(Document Order No. MPC7447AECS02AD)
MC
7447A
T
xx
nnnn
N
x
Product
Code
Part
Identifier
Specification
Modifier
Package
Processor
Frequency
Application
Modifier
Revision Level
MC
7447A
T = Extended
Temperature
Device
11.3
HX = HCTE BGA
867
1000
1167
N: 1.1 V ± 50 mV
–40 to 105°C
B:1.1: PVR = 8003 0101
Part Marking
Parts are marked as the example shown in Figure 25.
MC7447A
xxnnnnLx
AWLYYWW
MMMMMM
YWWLAZ
7447A
BGA / LGA
Notes:
AWLYYWW is the test code.
MMMMMM is the M00 (mask) number.
YWWLAZ is the assembly traceability code.
Figure 25. Part Marking for BGA and LGA Device
MPC7447A RISC Microprocessor Hardware Specifications, Rev. 5
54
Freescale Semiconductor
Ordering Information
THIS PAGE INTENTIONALLY LEFT BLANK
MPC7447A RISC Microprocessor Hardware Specifications, Rev. 5
Freescale Semiconductor
55
How to Reach Us:
Home Page:
www.freescale.com
email:
support@freescale.com
USA/Europe or Locations Not Listed:
Freescale Semiconductor
Technical Information Center, CH370
1300 N. Alma School Road
Chandler, Arizona 85224
(800) 521-6274
480-768-2130
support@freescale.com
Information in this document is provided solely to enable system and software implementers to
use Freescale Semiconductor products. There are no express or implied copyright licenses
Europe, Middle East, and Africa:
Freescale Halbleiter Deutschland GmbH
Technical Information Center
Schatzbogen 7
81829 Muenchen, Germany
+44 1296 380 456 (English)
+46 8 52200080 (English)
+49 89 92103 559 (German)
+33 1 69 35 48 48 (French)
support@freescale.com
granted hereunder to design or fabricate any integrated circuits or integrated circuits based on the
Japan:
Freescale Semiconductor Japan Ltd.
Technical Information Center
3-20-1, Minami-Azabu, Minato-ku
Tokyo 106-0047 Japan
0120 191014
+81 3 3440 3569
support.japan@freescale.com
data sheets and/or specifications can and do vary in different applications and actual performance
Asia/Pacific:
Freescale Semiconductor Hong Kong Ltd.
Technical Information Center
2 Dai King Street
Tai Po Industrial Estate,
Tai Po, N.T., Hong Kong
+800 2666 8080
support.asia@freescale.com
where personal injury or death may occur. Should Buyer purchase or use Freescale
For Literature Requests Only:
Freescale Semiconductor
Literature Distribution Center
P.O. Box 5405
Denver, Colorado 80217
(800) 441-2447
303-675-2140
Fax: 303-675-2150
LDCForFreescaleSemiconductor@
hibbertgroup.com
MPC7447AEC
Rev. 5
01/2006
information in this document.
Freescale Semiconductor reserves the right to make changes without further notice to any
products herein. Freescale Semiconductor makes no warranty, representation or guarantee
regarding the suitability of its products for any particular purpose, nor does Freescale
Semiconductor assume any liability arising out of the application or use of any product or circuit,
and specifically disclaims any and all liability, including without limitation consequential or
incidental damages. “Typical” parameters which may be provided in Freescale Semiconductor
may vary over time. All operating parameters, including “Typicals” must be validated for each
customer application by customer’s technical experts. Freescale Semiconductor does not convey
any license under its patent rights nor the rights of others. Freescale Semiconductor products are
not designed, intended, or authorized for use as components in systems intended for surgical
implant into the body, or other applications intended to support or sustain life, or for any other
application in which the failure of the Freescale Semiconductor product could create a situation
Semiconductor products for any such unintended or unauthorized application, Buyer shall
indemnify and hold Freescale Semiconductor and its officers, employees, subsidiaries, affiliates,
and distributors harmless against all claims, costs, damages, and expenses, and reasonable
attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated
with such unintended or unauthorized use, even if such claim alleges that Freescale
Semiconductor was negligent regarding the design or manufacture of the part.
Freescale™ and the Freescale logo are trademarks of Freescale Semiconductor, Inc. The
described product is a PowerPC microprocessor. The PowerPC name is a trademark of IBM Corp.
and used under license. All other product or service names are the property of their respective
owners.
© Freescale Semiconductor, Inc. 2006.
Download PDF

advertising