SMT381-VP User Manual - Sundance Multiprocessor Technology Ltd.

Unit / Module Name:
Dual channel 14-bit DAC – 840 MSPS
Unit / Module Number:
SMT381-VP
Used On:
SMT310Q and other carrier boards.
Document Issue:
1.0
Date:
18/08/2005
CONFIDENTIAL
Approvals
Date
Managing Director
Software Manager
Design Engineer
Sundance Multiprocessor Technology Ltd, Chiltern House, Waterside, Chesham, Bucks. HP5 1PS.
This documents is the property of Sundance and may not be copied nor communicated to a third party
without the written permission of Sundance. © Sundance Multiprocessor Technology Limited 1999
Revision History
Changes Made
18/08/05
First release, based on MRV’s version
Issue
Initials
1.0
PSR
List of Abbreviations
Abbreviation
Explanation
ATP
Acceptance Test Procedure
BCD
Binary Coded Decimal
BER
Bit Error Rate
BOM
Bill Of Materials
CDR
Clock and Data Recovery
CPCI
Compact PCI
DAC
Digital to Analog Converter
DDR
Double Data Rate
DLL
Delay Lock Loop
DSP
Digital Signal Processor
FPGA
Field Programmable Gate Array
GSPS
Giga Sample Per Second
LSB
Least Significant Bit
LVDS
Low Voltage Differential Signalling
LVPECL
Low Voltage Positive ECL
MSB
Most Significant Bit
NA
Not Applicable
PC
Personal Computer
PCB
Printed Circuit Board
PCI
Peripheral Component Interconnect
POR
Power On Reset
RSL
Rocket Serial Link
RSLCC
Rocket Serial Link Communications Channel
SDRAM
Synchronous Dynamic Random Access Memory
SHB
Sundance High-speed Bus
SI
Serial Interface
SMT
Sundance Multiprocessor Technology
SPI
Serial Peripheral Interface
TBD
To Be Determined
TI
Texas Instruments
VCO
Voltage Controlled Oscillator
Table of Contents
1 Introduction ............................................................................................................ 10
1.1 Overview.......................................................................................................... 10
1.2 Module Features.............................................................................................. 10
1.3 Possible Applications....................................................................................... 10
1.4 Related Documents ......................................................................................... 11
2 Functional Description............................................................................................ 12
2.1 Module Overview............................................................................................. 12
2.2 Communication Ports (ComPorts)................................................................... 13
2.3 Sundance High-Speed Bus (SHB) .................................................................. 13
2.4 Main Analogue characteristics......................................................................... 14
2.5 Data stream description................................................................................... 14
2.5.1 Description of internal FPGA blocks............................................................. 15
2.6 Clock Structure ................................................................................................ 17
2.7 External Trigger Structure ............................................................................... 18
2.8 Power Supply and Reset Structure ................................................................. 18
2.9 MSP430 Functionality...................................................................................... 19
2.10 FPGA Configuration ...................................................................................... 20
2.11 Analogue output section ................................................................................ 21
2.12 DAC Settings ................................................................................................. 22
3 Description of interfaces......................................................................................... 23
3.1 DAC Control Interface ..................................................................................... 23
3.2 DAC Data Interface ......................................................................................... 23
3.3 Memory Interface............................................................................................. 23
3.4 MSP430 Interface............................................................................................ 23
3.5 Serial Number.................................................................................................. 23
3.6 PLL Interface ................................................................................................... 24
3.7 Clock Synthesizer Interface............................................................................. 24
3.8 TIM Interface ................................................................................................... 24
3.9 External Trigger ............................................................................................... 24
3.10 Daughter card Interface................................................................................. 24
3.11 RSL Interface (RSL not yet available) ........................................................... 31
3.11.1 RSL Connector and Pinout Definition ..................................................... 31
3.11.2 RSL Cable Definition............................................................................... 33
3.12 SHB Interface ................................................................................................ 34
4 Firmware Description ............................................................................................. 36
4.2 Configuring the FPGA ..................................................................................... 36
4.3 Setting up the FPGA........................................................................................ 36
5 Control Register Settings ....................................................................................... 36
5.1 Control Packet Structure ................................................................................. 36
5.2 Reading and Writing Registers........................................................................ 38
5.3 Memory Map.................................................................................................... 39
5.4 Register Descriptions ...................................................................................... 41
5.4.1 The Reset Register (Write Add 0x000) ..................................................... 41
5.4.2 Firmware Version Register (Read Add 0x000) ......................................... 41
5.4.1 The Enable Register (Write Add 0x009) ................................................... 42
5.4.3 Temperature Registers (Read Add 0x020, 0x021, 0x028, 0x029)............ 42
5.4.4 Serial Number Registers (Read Add 0x022 – 0x025 and 0x02A – 0x02D) –
Not implemented in default MSP430 and FPGA designs. ................................. 43
5.4.5 DAC Clock Source Registers (Write Add 0x801)...................................... 43
5.4.6 Clock Synthesizer Setup Register (Write Add 0x800) .............................. 44
5.4.7 PLL Setup Registers (Write Add 0x802 – 0x809) ..................................... 44
5.4.8 Data Source Selection (Write Add 0x80E)................................................ 45
5.4.9 DAC Setup Registers (Write Add 0x900 – 0x905) .................................... 45
6 PCB Layout ............................................................................................................ 46
6.1 SMT381 PCB View.......................................................................................... 46
6.2 Assembly Drawings ......................................................................................... 47
6.3 SMT338-VP Assembly Drawings .................................................................... 49
6.4 SMT381 PCB View.......................................................................................... 50
7 General Properties ................................................................................................. 53
7.1 FPGA Mounted on SMT338-VP ...................................................................... 53
7.2 Design Resource Usage.................................................................................. 53
7.3 Power Supply .................................................................................................. 54
7.4 Module Dimensions ......................................................................................... 55
7.5 FPGA/JTAG Connector ................................................................................... 55
8 System Setup......................................................................................................... 56
8.1 How to connect the SMT381 to SMT338-VP................................................... 56
9 Module Performance.............................................................................................. 60
9.1 Introduction...................................................................................................... 60
9.2 LVDS Data interface........................................................................................ 60
9.3 Waveform Memory .......................................................................................... 61
10 Firmware Building Blocks..................................................................................... 65
10.1 Introduction.................................................................................................... 65
10.2 Clock Synthesizer.......................................................................................... 65
10.3 DAC serial setup............................................................................................ 66
10.4 PLL Configuration.......................................................................................... 69
11 Test Points ........................................................................................................... 72
Table of Tables
Table 1. Main analogue characteristics of the SMT381. ........................................... 14
Table 2. Daughter Card Interface Power Connector and Pinout............................... 27
Table 3. Register Memory Map (DAC registers not yet fixed in firmware) ................ 41
Table 4. Table of Connector Locations on SMT381.................................................. 52
Table 5. Table of Component Locations on SMT381................................................ 52
Table 6. Virtex-II Pro IO Count.................................................................................. 53
Table 7. Virtex-II Pro Device Utilization Summary. ................................................... 53
Table 8. SMT381 Power Supply Voltages. ............................................................... 54
Table 9. SMT381-VP Power Supply Voltages. ......................................................... 54
Table 10. Internal Power Supply Voltages. ............................................................... 54
Table 11. SMT381-VP Dimensions........................................................................... 55
Table 12. Clock Synthesizer Test Output.................................................................. 65
Table 13. Clock Synthesizer Division Setup. ............................................................ 66
Table 14. Configuration of the DACSerialSetupReg register. ................................... 68
Table of Figures
Figure 1. Functional Block diagram of SMT381-VP. ................................................. 12
Figure 2. Internal Data path of the SMT338-VP........................................................ 15
Figure 3. Clock tree of the SMT381. ......................................................................... 17
Figure 4. Power Generation and distribution............................................................. 19
Figure 5. Microcontroller State Machine. .................................................................. 19
Figure 6. Option 1 for the SMT381 analog output stage. .......................................... 21
Figure 7. Option 2 for the SMT381 analog output stage. .......................................... 21
Figure 8. Combined analog output circuit. ................................................................ 22
Figure 9. Daughter card connector interface............................................................. 25
Figure 10. Daughter Card Interface: Data Signals Connector and Pinout (Bank A). 28
Figure 11. Daughter Card Interface: Data Signals Connector and Pinout (Bank B). 29
Figure 12. Daughter Card Interface: Data Signals Connector and Pinout (Bank C). 30
Figure 13. Rocket Serial Link Interface. .................................................................... 31
Figure 14. Rocket Serial Link Interface Connector and Pinout (RSL A). .................. 32
Figure 15. Rocket Serial Link Interface Connector and Pinout (RSL B). .................. 33
Figure 16. Samtec HFEM Series Data Cable. .......................................................... 33
Figure 17. SHB Connector Pinout............................................................................. 35
Figure 18. Setup Packet Structure. ........................................................................... 37
Figure 19. Packet Structure – Defined Commands................................................... 37
Figure 20. Control Register Read Sequence. ........................................................... 38
Figure 21. Reset Register (Write Only). .................................................................... 41
Figure 22. Firmware Version Register (Read Only). ................................................. 42
Figure 21. Enable Register (Write Only). .................................................................. 42
Figure 23. Temperature Registers (Read Only)........................................................ 43
Figure 24. Serial Number Registers (Read Only). .................................................... 43
Figure 25. Serial Number Registers Cont. (Read Only)............................................ 43
Figure 26. Clock Source Selection Table (Write Only).............................................. 44
Figure 27. Clock Source Register (Write Only). ........................................................ 44
Figure 28. Clock Synthesizer Setup Register (Write Only). ...................................... 44
Figure 29. PLL Setup Registers (Write Only)............................................................ 45
Figure 30 – Data Source Selection. .......................................................................... 45
Figure 31. DAC Setup Registers (Write Only)........................................................... 46
Figure 32. SMT381 PCB layout - TOP...................................................................... 46
Figure 33. SMT381 PCB layout – BOTTOM. ............................................................ 47
Figure 34. SMT381 Top Assembly Drawings............................................................ 47
Figure 35. SMT381 Bottom Assembly Drawings. ..................................................... 48
Figure 36. Main Module Top Assembly Drawing. ..................................................... 49
Figure 37. Main Module Bottom Assembly Drawing. ................................................ 49
Figure 38. Side view of SMT381-VP (Height). .......................................................... 50
Figure 39. Side view of SMT381-VP. ........................................................................ 50
Figure 40. Top view of SMT381-VP. ......................................................................... 51
Figure 41. Connector Location on SMT381. ............................................................. 51
Figure 42. FPGA/JTAG connector for the SMT381-VP. ........................................... 55
Figure 43. SMT381 to SMT338-VP Interconnection. ................................................ 56
Figure 44. Components Used to Connect the SMT381 to the SMT338-VP.............. 57
Figure 45. Fitting of Nylon Screws and Nuts to the SMT338-VP. ............................. 58
Figure 46. Securing the SMT338-VP onto a Sundance Carrier. ............................... 58
Figure 47. Connecting the SMT381 to the SMT338-VP............................................ 59
Figure 48. Time View Captures of LVDS Interface Data........................................... 60
Figure 49. Measurements of Time View Capture...................................................... 60
Figure 50. Waveform Memory - Time View Capture – 1000MHz sample frequency
(500MHz VCO Clock) – 125MHz analog output. ............................................... 61
Figure 51. Measurements of Capture – 1000MHz sample frequency (500MHz VCO
Clock) – 125MHz analog output......................................................................... 61
Figure 52. Waveform Memory - FFT – 1000MHz sample frequency (500MHz VCO
Clock) – 125MHz analog output – Channel A.................................................... 62
Figure 53. Waveform Memory - FFT – 1000MHz sample frequency (500MHz VCO
Clock) – 125MHz analog output – Channel B.................................................... 62
Figure 54. Waveform Memory - FFT – 1400MHz sample frequency (700MHz
Synthesizer Clock) – 175MHz analog output – Channel A. ............................... 63
Figure 55. Waveform Memory - FFT – 1400MHz sample frequency (700MHz
Synthesizer Clock) – 175MHz analog output – Channel B. ............................... 63
Figure 56. Waveform Memory - FFT – 600MHz sample frequency (300MHz VCO
Clock) – 75MHz analog output – Channel A...................................................... 64
Figure 57. Waveform Memory - FFT – 600MHz sample frequency (300MHz VCO
Clock) – 75MHz analog output – Channel B...................................................... 64
Figure 58. Clock Synthesizer Register...................................................................... 65
Figure 59. Clock Synthesizer Frequency Calculation. .............................................. 66
Figure 60. DAC serial write operation. ...................................................................... 67
Figure 61. DAC serial read operation........................................................................ 67
Figure 62. State machine of the DAC for the SMT381.............................................. 68
Figure 63. Register Setup for PLL............................................................................. 69
Figure 64. PLL Configuration Sequence. .................................................................. 70
Figure 65. State Machine Driving the PLL Serial Interface. ...................................... 71
Figure 66. Test point locations on the SMT381. ....................................................... 72
Precautions (Please Read this!).
In order to guarantee that the SMT381-VP functions correctly and
to protect the module from damage, the following precautions
should be taken:
The SMT381-VP is a static sensitive product and should be
handled accordingly. Always place the module in a static protective
bag during storage and transition.
When operated, make sure that the heat generated by the system
is extracted e.g. by the use of a fan or an air blower. Sundance
recommends and uses PAPST 12-Volt fans (Series 8300)
producing an air flow of 54 cubic meters per hour (equivalent to
31.8 CFM). Fans are placed so they blow across the PCI bus.
Using RSL cause the FPGA to consume more current and
therefore dissipate more heat. In that case, it is strongly
recommended to use a fan to cool down the system and to monitor
the temperature on the module, function available on the SMT381VP.
SHB and RSL connectors are similar but their use is really
different. Do NOT connect an SHB and an RSL connectors
together with and SHB cable! This would cause irreversible
damages to the modules.
Naming Conventions.
The SMT381 refers to a dual channel, 14-bit, 840MSPS DAC
daughter card.
The SMT338-VP refers to a single width Virtex-II Pro based FPGA
module with a Sundance LVDS Bus interface (used for connecting
TIM modules to daughter cards)
The SMT381-VP refers to the SMT381 plugged onto the SMT338VP forming a complete module DAC + FPGA Module.
1 Introduction
1.1 Overview
The SMT381-VP is a single width expansion module that plugs onto the SMT338-VP.
It is capable of converting two external digital inputs coming form the SMT338-VP at
840 MSPS with a resolution of 14 bits, or from internal memory at 1GSPS. A Fujitsu
dual channel DAC (MB86064) performs the digital to analogue conversion.
The SMT381 (daughter card) is plugged into the SMT338-VP (main module). Digital
data is then supplied from the SMT338-VP via the daughter card connector over the
Sundance LVDS Bus (SLB) to the SMT381 which converts the digital data stream to
an analogue signal.
The SMT338-VP controls data transfers via ComPorts, Sundance High-speed Bus
(SHB) or the Rocket Serial Link (RSL). These interfaces are compatible with a wide
range of Sundance processor and I/O modules. The base module also has got some
DDR memory available for customer designs and not used in the default FPGA
firmware provided by Sundance.
A very important aspect must be kept in mind by the user. The DAC is rated for
1 GSPS but the SMT338-VP’s FPGA can only supply data to the DAC at 840MHz. It
is however possible to load data into the DAC internal memory. This internal data can
be converted at 1GSPS.
1.2 Module Features
The main features of the SMT381 are listed underneath:
• Dual channel DAC
• 1 GSPS conversion frequency from internal memory
• 840MSPS conversion frequency for data coming from the SMT338-VP (via
SLB bus)
• 14 Bit data resolution
• Custom Clock and Trigger inputs via external connectors
• Internal Waveform generator
• Standard Sundance ComPorts and SHB interfaces for easy interconnection to
Sundance products (interfaces for data sample and non-real-time processing)
1.3 Possible Applications
The SMT381-VP can be used for the following applications (this non-exhaustive list
should be taken as an example):
• Broadband cable modem head-end systems
• 3G Radio transceivers
• High-data-rate point-to-point radios
• Medical imaging systems
• Spectrum analyzers
1.4 Related Documents
[1] Sundance High-speed Bus (SHB) specifications – Sundance.
ftp://ftp2.sundance.com/Pub/documentation/pdffiles/SHB_Technical_Specification_v1_0.pdf
[2] RocketIO Serial Links (RSL) specifications – Sundance.
ftp://ftp2.sundance.com/Pub/documentation/pdffiles/RSL_Technical_Specification_v1_0.pdf
[3] TIM specifications.
ftp://ftp2.sundance.com/Pub/documentation/pdf-files/tim_spec_v1.01.pdf
[4] Sundance LVDS Bus (SLB) specifications – Sundance.
http://www.sundance.com/docs/SLB%20-%20Technical%20Specifications.pdf
[5] Virtex-II Pro FPGA datasheet - Xilinx.
http://direct.xilinx.com/bvdocs/publications/ds083.pdf
[6] Fujitsu MB86064 DAC datasheet.
http://www.fme.fujitsu.com
[7] ComPort specification – Texas Instruments.
http://focus.ti.com/lit/ug/spru63c.pdf
2 Functional Description
2.1 Module Overview
600MHz 1200MHz
VCO
25MHz 400MHz
Clock Synth
LVPECL
Clock Generation
and
Distribution
div
2
Ext
Trigger
(1d)
Ext
Trigger
Ch A and Ch B
div
8
Daughter
Card
Connector
Input Clock
(1d)
Input Clock (1d)
Output
CHA
Data Sync Clock (1d)
Signal
Conditioning
Data Channel A (14d)
Data Channel B (14d)
SMT338
FPGA
Digital to Analog
Convertor
(MB86064)
Loop Clock (1d)
1V8
Convertor
circuit
Ch
A
Output
CHB
Signal
Conditioning
Loop Clock (1d)
SMT338-VP
External Clock
Ch
B
Control (4)
SMT381
Notes:
The numbers in brackes denote the
amount of FPGA IO pins requires.
'd' is used for differential pairs. 1d
Will thus requre 2 IOs
Figure 1. Functional Block diagram of SMT381-VP.
The SMT338-VP sends the digital data to the module via the daughter card
connector. Data is clocked out of the FPGA on both edges of the DAC clock (DDR).
The user can provide this clock by means of the on-board VCO, on-board Clock
synthesizer or custom external clock. The external clock can be provided as an
LVPECL clock or as an RF clock (two separate inputs).
All digital functions on the module are controlled by the SMT338-VP FPGA. There
are two 14-bit LVDS ports on the DAC which converts the data on a DDR clock. The
sampled data can either be supplied to the DAC cores externally via the LVDS data
bus or internally from the Waveform Memory Module. The data may be routed to the
DAC cores through a number of paths. The most direct path routes data straight from
the LVDS input buffers to the DAC core input latches.
There are two DAC cores present in the MB86064. Thus two channels are available
for outputs. The outputs of the DAC are differential currents, which are converted to a
voltage by the analogue output stage (RF Transformer).
The design of the SMT381-VP is split over two PCBs. The main PCB (main module –
SMT338-VP) contains the FPGA and the digital connector interfaces (TIM, SHB and
RSL). The main memory as well as the MSP430 microprocessor is also located on
this PCB. The second PCB (daughter card – SMT381) contains all the analog
circuitry, the clock generation, trigger control, analog signal conditioning and DAC is
located on this PCB. The SMT381-VP refers to the combination of the SMT338-VP
and the SMT381.
The depth of the SMT381-VP is 21 mm. If the SMT381-VP is mated with a PCI
carrier two PCI slots will be required for the Module + Carrier combination. If the
SMT381-VP is mated with a cPCI carrier the Module + Carrier will require two cPCI
slots.
The FPGA gets control words over a ComPort interface following the Texas
Instruments C4x ComPort standard. The FPGA receives data through the RSL
connectors or SHB connectors or a look-up-table inside the FPGA. It is then sent to
the DAC cores over two 14-bit LVDS busses according to the SLB standard. The
DACs convert the data and sends the data to the output connectors.
Two full (60-pin) SHB connectors are accessible from the FPGA. Their main function
is to receive digital samples from other modules. Please refer to the SHB
specification for more details about the way connectors can be configured.
A global reset signal is mapped to the FPGA from the bottom TIM connector via the
MSP430 microcontroller.
2.2 Communication Ports (ComPorts)
The SMT381-VP provides two ComPorts – ComPort 0 and ComPort 3. Both of these
ComPorts are connected to the FPGA on the SMT338-VP. ComPort 3 is also
connected to the MSP430 microprocessor. The microprocessor is the master of this
ComPort after reset and configures the FPGA with configuration data received over
this link. After configuration the microprocessor releases the ComPort to the FPGA.
These ComPorts are driven at 3.3V levels.
2.3 Sundance High-Speed Bus (SHB)
Two SHB connectors are used to transmit data to the SMT381-VP from the external
world. Both SHB busses are identical and 60-bits wide. See the SHB specification
for more information.
2.4 Main Analogue characteristics
The main analogue characteristics are listed in the following table:
Analogue outputs
Output current range
20mA
Data Format
Analogue current
External sampling clock inputs (The clock frequency is divided by 2 on the SMT381 for a DDR clock for the DAC)
LVPECL Clock
Signal format
LVPECL
Frequency range
25MHz to 1000 MHz
RF Clock
Signal format
Sinus wave
Frequency range
25MHz to 1000 MHz
Amplitude
0dBm Typ
External trigger inputs
Signal format
LVPECL
Frequency range
DC to 100 MHz
ADC Performance @ Single tone at -1dBFS, 800MSa/s, DC to 400MHz (From DAC datasheet)
Spurious Free Dynamic Range (SFDR) @ 20MHz
75dBc
Spurious Free Dynamic Range (SFDR) @ 300MHz
58dBc
Cross-talk 4 tone test, each tone at -15dBFS, centred at 276MHz
67dBc
Table 1. Main analogue characteristics of the SMT381.
2.5 Data stream description
The data paths for both channels on the module are the same. The DAC is driven by
a single clock either generated on the module or provided by the user through an
MMBX connector. As only a single clock is present on the module the two data-paths
will always be in exact synchronization. As the data path on this module finds its
origin in the SMT338-VP’s FPGA the internal data path of the FPGA must also be
explained. Figure 2 shows the SMT338-VP’s FPGA data path.
DDR SDRAM
Pre-process
Data
DPRAM
Pre-process
Data
DAC
Channel A
Pre-process
Data
SHB for Channel A
RSL Interface
RSL for Channel A
SHB Interface
SHB for Channel B
RSL Interface
RSL for Channel B
Look-up
Table
Pre-process
Data
Pre-process
Data
DAC
Channel B
SHB Interface
Mux
DPRAM
Pre-process
Data
Mux
Pre-process
Data
Look-up
Table
Pre-process
Data
DDR SDRAM
Figure 2. Internal Data path of the SMT338-VP.
The digital data stream is received from four different sources. The first data stream
is a direct RSL interface for real-time type applications. While the second stream
comes from an block of ROM implemented into the FPGA (Look-up Table with a
fixed sine pattern). The SHB interface can be connected directly to the DAC as a
data source or can load a block of Dual Port RAM (DPRAM), which is read out
continuously afterwards.
It is to be noted that the DDR SDRAM, even though on the board is not used in the
default FPGA firmware provided by Sundance.
Each data stream is then conditioned (data format change) and sent to the SMT381
via the daughter card connector (SLB). A multiplexer selects between the four data
sources and is controlled by an internal register.
2.5.1 Description of internal FPGA blocks
Pre-processing Data
This is mainly to convert a 64 or 32-bit data format into 14-bit.
RSL Interface
The RSL Interface block takes the high-speed serial input (2.5Gbits/s) data stream
and converts it into a parallel data stream (64-bit).
Mux
The multiplexer selects between these four data streams to send to the SMT381. The
selection is made by the way of a internal register loaded via ComPort.
SHB Interface
The SHB interface controls the SHB bus between the SMT338-VP and any module
connected to the SHB sending the data.
In addition to the above interface blocks the FPGA also implements the following
functions (not indicated on the diagram):
Trigger Interface
Handles all triggers. Triggers may be received from the external hardware trigger
connectors (two separate triggers – one for each channel), or by receiving a trigger
command over the ComPort (also separate commands for each channel). When a
trigger is received data is sent to the SMT381 from the memory on the SMT338-VP.
DAC Control Interface
Control interface for writing setup information to the DAC on the SMT381 to configure
it for any selected mode of operation. Data is received over the ComPort interface
and written out to the DAC over a serial interface.
Clock Synthesizer Interface
Control interface for writing setup information to the clock synthesizer on the SMT381
to configure its clock output frequency. Data is received over the ComPort interface
and written out to the clock synthesizer over a serial interface.
PLL Interface
Control interface for writing setup information to the PLL on the SMT381 to configure
the VCO output voltage. Data is received over the ComPort interface and written out
to the PLL over a serial interface. The PLL drives one VCO circuit. This VCO + PLL
circuit generates the main system clock and is configurable between 600 and 1200
MHz. The side is called the RF side. This clock is then divided by two which enables
the DAC to have a very stable PLL + VCO clock ranging from 300 to 600MHz.
DAC Interface
The DAC interface sends a high speed data stream from the FPGA to the DAC
present on the SMT381. There are two channels available on the DAC and data is
latched into the DAC on the rising and falling edge (DDR) of the DAC’s input clock
which is clocked into the FPGA to make data synchronization easier. The inputs are
14bit data streams which is clocked out of the FPGA at a maximum frequency of
420MHz (on both edges, thus 840MSPS).
Clock Tree Setup Interface
There are various clock routing configurations available for the SMT381. This
interface configures the clock tree.
2.6 Clock Structure
There are two integrated clock generators on the module. The user can either use
these clocks or provide the module with an external clock (input via MMBX
connectors). The following figure shows the SMT381 clock tree.
External Clocks
Ext RF
Clock
Input
(MMBX)
Ext
LVPECL
Clock
Input
(MMBX)
Clk Synth (25MHz 400MHz)
VCO (600MHz 1200MHz)
PLL
Clk Synth
Voltage Controlled
Oscillator
ECL
Comparator
ECL
Reciever/
Driver
Comparator
2:1 Mux
div 2
LVPECL
Buffer
Clock Div 2
TTL to LVPECL
3:1 Mux with Dual Output
DAC clock
output
(MMBX)
Fanout
Buffer
Clock
Div 8
DAC
Loop
Clock
External Trigger
External Trigger Input
(MMBX)
LVPECL
Buffer
PLL
Data
Clock
Clock
Control
FPGA - SMT338-VP
Figure 3. Clock tree of the SMT381.
The main clock tree of the SMT381 consists of two clock sources to achieve the
DAC’s full range of input frequencies (DC – 500MHz). The first clock source is a
MICREL clock synthesizer which has a range from 50MHz to 950MHz. This source’s
disadvantage however is that it has a jittery output and thus the clock is not that
stable. Its advantage however is that it can attain a wide range of frequencies,
especially the lower frequencies. The output clock is LVPECL.
The second clock source is a Voltage Controlled Oscillator (VCO) with a phase lock
loop. This combination has a very stable output. However a limited frequency range
can be attained by this combination (300MHz – 600MHz). This is achieved by taking
a 600MHz -1200MHz VCO and dividing the output by 2. The output clock must also
be scaled to LVPECL.
Alternatively the user can provide the module with an external LVPECL clock or an
external RF clock. The user can select between any of these input clocks.
The selected clock then drives the DAC and is also distributed to the main module
(SMT338-VP) for data synchronization purposes. On the FPGA of the SMT338-VP a
PLL synchronizes the clock with the data being sent by using the supplied clock and
looping that same clock to the DAC and back. This technique synchronizes the clock
to the data is being sent out on (SMT338-VP side) even further with the clock used in
the DAC. Synchronization issues become a bigger factor as the clock frequencies get
bigger.
All the clock control is done on the SMT338-VP side in firmware on the FPGA. The
multiplexer selects the clock and this clock is then used inside the DAC and SMT338VP for data transmitting purposes. The set up of the clock packages is also done in
firmware.
Finally an external trigger is supplied to the SMT338-VP and the multiplexed clock
divided by 8. The trigger can be used for memory storing and retrieving functions etc.
while the clock divided by 8 is mainly for debugging purposes.
2.7 External Trigger Structure
A control register allows enabling External Triggers and to select whether they are
active high or low.
They are implemented as enable signals to the data path and behave the same way
for all data sources.
2.8 Power Supply and Reset Structure
The SMT381 uses the following voltages: 12V, -12V, 5V, -5.2V, 3.3V and 1.8V. Only
two voltages must be generated on the SMT381 as the rest are supplied by the
carrier. The voltages that must be generated are -5.2V and 1.8V. -5.2V is used for
the comparator and op amp in the clock circuitry while 1.8V is used for the serial
control interface on the DAC.
All the other voltages are supplied by the carrier and thus present on the SMT338VP. The required voltages are then supplied to the SMT381 by a daughter card
power connector present on the SMT338-VP and SMT381. The SMT381 plugs into
this power connector and thus has power for all its modules.
Pin X_RESET is the only reset option on the SMT381. This pin resides on the DAC.
On the falling edge of X_RESET the DAC is reset and all registers are set to their
default values. After a reset most parts of the device are powered down.
The following figure shows the power structure of the SMT338-VP and SMT381:
TIM Connector
D+5V0_IN
TIM
Mounting Hole
D+3V3_IN
Vccaux
DC / DC
Converter
D+2V5
Vccint
DC / DC
Converter
D+1V5
Daughter Card
D+5V0
Low Dropout
Regulator
Analog Power
Switch
On / Off
Control
D+3V3
Main Module to
Daughter Card
Power
Connector
Analog Filter
Analog Filter
D-12V0
D+12V0
D+3V3
Voltage
Measure
Analog Filter
Voltage
Measure
D-5V2
MSP430
Microprocessor
Low Dropout
Regulator
A+3V3
D+1V8
TIM Connector
D+12V0 and
D-12V0
Main Module
Figure 4. Power Generation and distribution.
2.9 MSP430 Functionality
The MSP430 implements analog control functionality that is difficult to implement in
the FPGA. The microprocessor
• Controls the power start-up sequence
• Controls the reset structure on the module
Figure 5. Microcontroller State Machine.
At power-up or on a TIM Reset or on a nConfig line going low, the state machine
goes into an INIT State. TIM Reset and nConfig lines are available on the carrier
module – see TIM Specifications for location on TIM connectors).
From there, it has two choices depending on the state of the FPGA (configured i.e.
DONE pin high or un-programmed i.e. DONE Pin Low). To configure the FPGA,
simply send a Start Key followed by the bitstream and then and End Key. To re-start
the FPGA with the current bitstream loaded, simply send a End Key.
Start Key = 0xBCBCBCBC and End Key = 0xBCBCBC00.
A TIM Reset can be issued to reconfigure the FPGA at anytime, but may reset other
modules as well. In the case of reconfiguring a particular module, the nConfig line is
used.
MSP430 is connected to ComPort 3 of the TIM. With the standard firmware
implementation ComPort 3 is used to communicate with the FPGA. ComPort 0 is
open for custom applications as it is not used by the SMT381-VP.
2.10 FPGA Configuration
In a typical Sundance system a carrier and host module (most likely a DSP module)
is needed to configure the SMT381-VP.
After a hardware reset the FPGA of the SMT381-VP is un-configured and the
microprocessor (MSP430) waits for a data stream. At this point the microprocessor is
in control of ComPort 3. The host can then send a data stream over ComPort 3
starting with a STARTKEY, then the data, and ending with an ENDKEY. This will
configure the FPGA via the microprocessor, and after configuration the
microprocessor will release ComPort3 so that the host can talk straight to the FPGA.
If at any time the host want to reset the FPGA the host must send a reset command
to it the SMT381-VP over the ComPort – Any hardware resets coming over the TIM
site will be caught by the microprocessor but will not be passed on to the FPGA.
If the FPGA is configured, but the host restarts its application, it must send an
ENDKEY only. This will ‘wake up’ the FPGA and the uP will release ComPort 3 so
that the host can use it for FPGA communication.
If the host want to reconfigure the FPGA it must toggle the nConfig line on the TIM
site. This will give control of the ComPort back to the microprocessor, but it will not
un-configure the FPGA. If the host then start sending a new bit-stream starting with a
STARTKEY, the FPGA will be un-configured and the new bit-stream will load. If after
toggling the nConfig line, if the host does not want to re-configure the FPGA, it must
send an ENDKEY like described above.
The above structure makes it possible to:
• Reset only the FPGA in the system and
• Make sure that the FPGA is not un-configured every time the host application
is re-run as it takes time for the FPGA to re-configure (approximately 35
seconds).
2.11 Analogue output section
Two options are hardwired into the design. The options are shown below with a
figure of each.
Option 1
Single ended AC coupled output with Macom TP-101 transformer.
TP101
Output
Connector
+
R1
R1
Figure 6. Option 1 for the SMT381 analog output stage.
Option 2
Differential DC coupled output with + and – channels going to separate connectors
Output
Connector
+
R2
R2
Output
Connector
Figure 7. Option 2 for the SMT381 analog output stage.
Combined circuit
The two combined:
0 ohm
TP101
+
R3
R3
0 ohm
Figure 8. Combined analog output circuit.
Depending on whether an AC or DC coupled version is ordered the board will be
assembled accordingly to either give the AC or DC coupled circuit shown above.
For more information consult the Fujitsu (MB86064) DAC datasheet [6].
2.12 DAC Settings
All DAC settings are controlled and implemented by the 4 wire serial control
interface. The serial interface uses pins SERIAL_IN, SERIAL_OUT, SERIAL_CLK
and SERIAL_EN. Programmed settings are stored in a number of registers which are
individually accessible using either a 7-bit (WMM Registers) or 10-bit (DAC Core
Registers) address/control word. Data may be written to or read from each of these
registers.
For more information consult the Fujitsu (MB86064) DAC datasheet [6].
3 Description of interfaces
3.1 DAC Control Interface
A four wire uni-directional control interface is implemented between the FPGA and
the DAC. This interface is used for clocking configuration information into the DAC.
Note 1: The serial interface on the DAC side uses 1.8V signalling levels. These
control lines are however connected unto a 3.3V bank on the FPGA with additional
pull-up resistors on the SMT381 to 1.8V. For this reason the FPGA firmware may
never drive ‘1’ out on these pins as it will drive the DAC at 3.3V and thus damage it.
The firmware may only drive ‘0’ for ‘0’ and ‘Z’ for ‘1’. Because of the pull-up resistor
the ‘Z’ will be pulled up to 1.8V. This approach works well and any used wishing to
develop his own firmware is advised to take a look at the SMT381 example firmware
before developing his own.
3.2 DAC Data Interface
The output of each channel from the SMT338-VP to the DAC is a 14-bit LVDS data
bus clocked on the synchronized DAC clock.
Note 1: The data bus between the FPGA and the DAC is wired in a strange way to
assist routing. If a user wants to develop his own VHDL design and not use the
example design he is advised to take a look at the wiring of the example design to
assist him with his own design.
Note 2: On Rev 01 of the SMT381 the positive and negative data pairs of the LVDS
bus between the FPGA and the DAC is swapped for one of the two channels. This
results in a data flip. This issue is corrected in firmware by inverting the data before
writing it out over the interface. Once again any user wanting to do his own design is
advised to take a look at the example firmware design.
3.3 Memory Interface
The current FPGA firmware provided by Sundance does not implement any DDR
Memory interface.
3.4 MSP430 Interface
After configuration the microprocessor communicates with the FPGA using the IO
pins of the FPGA Slave Select Configuration interface. The MSP is responsible for
reading temperatures from the temperature sensor device.
It can also control a 64-bit hard coded serial number and measure some of the power
supply voltages. These 2 functions have been taken of the default MSP430) code
provided by Sundance to allow faster configuration of the FPGA.
3.5 Serial Number
A Maxim 1-Wire silicon serial number device is located on the SMT381 and the
SMT338-VP. This is used to assign a unique serial number to each module. That
function have been taken of the default MSP430) code provided by Sundance to
allow faster configuration of the FPGA.
3.6 PLL Interface
A three wire uni-directional control interface is implemented between the FPGA and
the PLL on the daughter card. This PLL sets and controls the voltage for the VCO
that generates the main clock.
3.7 Clock Synthesizer Interface
A three wire uni-directional control interface is implemented between the FPGA and
the Micrel clock synthesizer on the daughter card. The clock synthesizer can
generate a variable 50 – 950 MHz clock. The jitter on this clock is higher than on the
main PLL+VCO clock, but it is convenient for testing.
3.8 TIM Interface
The SMT381-VP implements ComPorts 0 and 3. There are no DIP switches on the
module and all configuration data is received and transmitted over these two ports.
The ComPorts are not used for DAC data transfer. ComPort 3 is implemented as a
bi-directional transceiver interface for FPGA configuration and control operations.
ComPort 0 is available but not used in the default firmware provided with the board.
The Global Bus Interface is not implemented on the SMT381. Refer to [3] for a more
detailed description of the TIM interface.
3.9 External Trigger
The external trigger input is received by a LVPECL input buffer on the SMT381. The
buffered signal is passed down as a differential LVPECL signal to the FPGA on the
SMT338-VP. The external triggers are DC-coupled to allow slow pulses to go through
and differential.
3.10 Daughter card Interface
The daughter-card interface is made up of two connectors. The one is a 0.5mm pitch
differential Samtec connector. This connector is for transferring digital LVDS data to
the DAC from the main module. The second one is a 1mm pitch Samtec header type
connector. This connector is for providing power to the daughter-card.
The figure underneath illustrates this configuration. The bottom view of the daughter
card is shown on the right. This view must the mirrored to understand how it
connects to the main module.
Data Connectors
Top Primary TIM Connector
Bank A
Bank B
Power Connector
Bank C
Power
Samsung
DDR266 SDRAM
Samsung
DDR266 SDRAM
RSL
B
Power Connector
RSL
A
Xilinx
Virtex-II Pro
XC2VP30-6
FF896 Package
SHB
B
SHB
A
FPGA
Config
Global Bus Connector
SMT338-VP
SMT381
Figure 9. Daughter card connector interface
The female differential connector is located on the main module. The Samtec Part
Number for this connector is QTH-060-01-F-D-DP-A.
The female power connector is located on the main module. The Samtec Part
Number for this connector is BKS-107-01-F-V-A
The male differential connector is located on the daughter card. The Samtec Part
Number for this connector is QSH-060-01-F-D-DP-A
The male power connector is located on the daughter card. The Samtec Part Number
for this connector is BKT-107-03-F-V-A
The mated height between the main module and the daughter card is 5 mm.
Each pin on the power connector can carry 1.5 A. Digital 5V (D+5V0), digital 3V3
(D+3V3), digital 12V0 (D+12V0), digital -12V0 (D-12V0) and digital ground (DGND) is
provided over this connector. D+3V3 and D+5V0 are assigned four pins each while
D+12V0 and D-12V0 are assigned two each. The daughter card can thus draw a
total of 6A for the D+3V3 and D+5V0 supplies while D+12V0 and D-12V0 can only
supply 3A. The integral ground plane on the differential connector provides additional
grounding. The following table shows the pin assignment on the power connector:
Pin Number
Pin Name
Description of Signal
1
D+3V3
Digital 3.3 Volts
2
DGND
Digital Ground
3
D+3V3
Digital 3.3 Volts
4
DGND
Digital Ground
5
D+3V3
Digital 3.3 Volts
6
DGND
Digital Ground
7
D+3V3
Digital 3.3 Volts
8
DGND
Digital Ground
9
D+5V0
Digital 5.0 Volts
10
DGND
Digital Ground
11
D+5V0
Digital 5.0 Volts
12
DGND
Digital Ground
13
D+5V0
Digital 5.0 Volts
14
DGND
Digital Ground
15
D+5V0
Digital 5.0 Volts
16
DGND
Digital Ground
17
D+12V0
Digital 12.0 Volts
18
DGND
Digital Ground
19
D+12V0
Digital 12.0 Volts
20
DGND
Digital Ground
21
D-12V0
Digital -12.0 Volts
22
DGND
Digital Ground
23
D-12V0
Digital -12.0 Volts
24
DGND
Digital Ground
25
DGND
Digital Ground
26
NC
27
NC
28
NC
29
NC
30
NC
31
TDI
Loop with TDO
32
TDO
Loop with TDI
33
DGND
Digital Ground
Table 2. Daughter Card Interface Power Connector and Pinout.
The following few pages describes the signals on the data connector between the
main module and the daughter card. Bank A on the connector is used for the DAC
Channel A data bus. Bank C is used for the DAC channel B data bus. Bank B is used
for system clock and trigger signals, DAC control signals and general system control
signals. The general system control signals include: clock control interface (for the
clock modules present on the SMT381), daughter card sense signal, daughter card
ID signals, low drop out regulator control signals and daughter card DAC reset signal.
All reserved signals are connected to the FPGA on the main module for future
expansion.
Bank A
Bank B
13 57
Bank C
41 43
81 83
24 68
Bank A
Pin No
Pin Name
Dir
1
Signal Description
Pin No
Pin Name
Signal Description
Main Module to Daughter Card
Dir
Main Module to Daughter Card
DOAI0p
Data In 0 Channel A, pos.
2
DOBI0p
Data In 1 Channel A, pos.
3
DOAI0n
Data In 0 Channel A, neg.
4
DOBI0n
Data In 1 Channel A, neg.
Dir
Main Module to Daughter Card
Dir
Main Module to Daughter Card
5
DOAI1p
Data In 2 Channel A, pos.
6
DOBI1p
Data In 3 Channel A, pos.
7
DOAI1n
Data In 2 Channel A, neg.
8
DOBI1n
Data In 3 Channel A, neg.
Dir
Main Module to Daughter Card
Dir
Main Module to Daughter Card
9
DOAI2p
Data In 4 Channel A, pos.
10
DOBI2p
Data In 5 Channel A, pos.
11
DOAI2n
Data In 4 Channel A, neg.
12
DOBI2n
Data In 5 Channel A, neg.
Dir
Main Module to Daughter Card
Dir
Main Module to Daughter Card
13
DOAI3p
Data In 6 Channel A, pos.
14
DOBI3p
Data In 7 Channel A, pos.
15
DOAI3n
Data In 6 Channel A, neg.
16
DOBI3n
Data In 7 Channel A, neg.
Dir
Main Module to Daughter Card
Dir
Main Module to Daughter Card
17
DOAI4p
Data In 8 Channel A, pos.
18
DOBI4p
Data In 9 Channel A, pos.
19
DOAI4n
Data In 8 Channel A, neg.
20
DOBI4n
Data In 9 Channel A, neg.
Dir
Main Module to Daughter Card
Dir
Main Module to Daughter Card
21
DOAI5p
Data In 10 Channel A, pos.
22
DOBI5p
Data In 11 Channel A, pos.
23
DOAI5n
Data In 10 Channel A, neg.
24
DOBI5n
Data In 11 Channel A, neg.
Dir
Main Module to Daughter Card
Dir
Main Module to Daughter Card
25
DOAI6p
Data In 12 Channel A, pos.
26
DOBI6p
Data In 13 Channel A, pos.
27
DOAI6n
Data In 12 Channel A, neg.
28
DOBI6n
Data In 13 Channel A, neg.
Dir
Reserved
Dir
Reserved
29
Reserved
Reserved
30
Reserved
Reserved
31
Reserved
Reserved
32
Reserved
Reserved
Dir
Daughter Card to Main Module
Dir
Main Module to Daughter Card
33
ClkOIp
Output Ready, I channel,
pos
34
DOIRIp
Loop back clock to DAC, pos.
35
ClkOIn
Output Ready, I channel,
neg
36
DOIRIn
Loop back clock to DAC, neg.
Dir
Daughter Card to Main Module
Dir
Daughter Card to Main Module
37
SysClockp
System clock, pos.
38
ExtTriggerIp
External Trigger A, pos.
39
SysClockn
System clock, neg.
40
ExtTriggerIn
External Trigger A, neg.
Figure 10. Daughter Card Interface: Data Signals Connector and Pinout (Bank A).
Bank A
Bank B
13 57
Bank C
41 43
81 83
24 68
Bank B
Pin No
Pin Name
Type
Signal Description
Pin No
Pin Name
Signal Description
MSP system signals
Type
MSP system signals
Dir
Bi-Directional
Dir
Bi-Directional
41
SMBClk
TmpCntrl0
42
SMBData
TmpCntrl1
43
SMBnAlert
TmpCntrl2
44
SerialNo
Serial Number
45
Reserved
Reserved
46
Reserved
Reserved
47
Reserved
Reserved
48
Reserved
Reserved
49
D3V3Enable
D3V3Enable
50
D1V8Enable
D1V8Enable
Type
FPGA system signals
Type
FPGA system signals
Dir
Bi-Directional
Dir
Bi-Directional
51
DACCntrl0
DAC Control 0
52
DACCntrl0
DAC Control 1
53
DACCntrl0
DAC Control 2
54
DACCntrl0
DAC Control 3
55
DACCntrl0
DAC Control 4
56
AdjClkSClk
AdjClockCntrl0
57
AdjClkSData
AdjClockCntrl1
58
AdjClkSLoad
AdjClockCntrl2
59
AdjClkTest
AdjClockCntrl3
60
PllClk
PllCntrl0
61
PllData
PllCntrl1
62
PllLe
PllCntrl2
63
PllFoLd
PllCntrl3
64
AdcAClkSel
AdcAClkSel
65
AdcBClkSel
AdcBClkSel
66
IntClkDivEn
IntClkDivEnable
67
IntClkDivnReset
IntClkDivnReset
68
IntExtClkSel
IntExtClkSel
69
IntExtClkSelnReset
IntExtClkSelnReset
Type
FPGA JTAG
Type
FPGA JTAG
Dir
Bi-Directional
Dir
Bi-Directional
70
FpgaVref
FpgaVref
71
FpgaTck
FpgaTck
72
FpgaTms
FpgaTms
73
FpgaTdi
FpgaTdi
74
FpgaTdo
FpgaTdo
Type
MSP JTAG
Type
MSP JTAG
Dir
Bi-Directional
Dir
Bi-Directional
75
MspVref
MspVref
76
MspTck
MspTck
77
MspTms
MspTms
78
MspTdi
MspTdi
79
MspTdo
MspTdo
80
MspnTrst
MspnTrst
Figure 11. Daughter Card Interface: Data Signals Connector and Pinout (Bank B).
Bank A
Bank B
13 57
Bank C
41 43
81 83
24 68
Bank C
Pin No
Pin Name
Dir
Signal Description
Pin No
Pin Name
Signal Description
Daughter Card to Main Module
Dir
Daughter Card to Main Module
81
DOAQ0p
Data In 0 Channel B, pos.
82
DOBQ0p
Data In 1 Channel B, pos.
83
DOAQ0n
Data In 0 Channel B, neg.
84
DOBQ0n
Data In 1 Channel B, neg.
Dir
Daughter Card to Main Module
Dir
Daughter Card to Main Module
85
DOAQ1p
Data In 2 Channel B, pos.
86
DOBQ1p
Data In 3 Channel B, pos.
87
DOAQ1n
Data In 2 Channel B, neg.
88
DOBQ1n
Data In 3 Channel B, neg.
Dir
Daughter Card to Main Module
Dir
Daughter Card to Main Module
89
DOAQ2p
Data In 4 Channel B, pos.
90
DOBQ2p
Data In 5 Channel B, pos.
91
DOAQ2n
Data In 4 Channel B, neg.
92
DOBQ2n
Data In 5 Channel B, neg.
Dir
Daughter Card to Main Module
Dir
Daughter Card to Main Module
93
DOAQ3p
Data In 6 Channel B, pos.
94
DOBQ3p
Data In 7 Channel B, pos.
95
DOAQ3n
Data In 6 Channel B, neg.
96
DOBQ3n
Data In 7 Channel B, neg.
Dir
Daughter Card to Main Module
Dir
Daughter Card to Main Module
97
DOAQ4p
Data In 8 Channel B, pos.
98
DOBQ4p
Data In 9 Channel B, pos.
99
DOAQ4n
Data In 8 Channel B, neg.
100
DOBQ4n
Data In 9 Channel B, neg.
Dir
Daughter Card to Main Module
Dir
Daughter Card to Main Module
101
DOAQ5p
Data In 10 Channel B, pos.
102
DOBQ5p
Data In 11 Channel B, pos.
103
DOAQ5n
Data In 10 Channel B, neg.
104
DOBQ5n
Data In 11 Channel B, neg.
Dir
Daughter Card to Main Module
Dir
Daughter Card to Main Module
105
DOAQ6p
Data In 12 Channel B, pos.
106
DOBQ6p
Data In 13 Channel B, pos.
107
DOAQ6n
Data In 12 Channel B, neg.
108
DOBQ6n
Data In 13 Channel B, neg.
Dir
Reserved
Dir
Reserved
109
Reserved
Reserved
110
Reserved
Reserved
111
Reserved
Reserved
112
Reserved
Reserved
Dir
Daughter Card to Main Module
Dir
Daughter Card to Main Module
113
ClkOQp
Output Ready, Q channel,
pos
114
DOIRQp
Loop back clock to FPGA, pos.
115
ClkOQn
Output Ready, Q channel,
116
DOIRQn
Loop back clock to FPGA, neg.
neg
Dir
Daughter Card to Main Module
Dir
Daughter Card to Main Module
117
RslClockp
Rsl Clock, pos.
118
ExtTriggerQp
External Trigger A, pos.
119
RslClockn
Rsl Clock, neg.
120
ExtTriggerQn
External Trigger A, neg.
Figure 12. Daughter Card Interface: Data Signals Connector and Pinout (Bank C).
3.11 RSL Interface (RSL not yet available)
3.11.1 RSL Connector and Pinout Definition
The Rocket Serial Link (RSL) is a serial based communications interconnection
standard that is capable of transfer speeds of up to 2.5GBit/s per link. Up to four links
can be combined to form a Rocket Serial Link Communications Channel (RSLCC)
that is capable of data transfer up to 10GBit/s.
Each RSL is made up of a differential Tx and Rx pair. A single RSL can thus transfer
data at 2.5GBit/s in both directions at the same time. Rocket Serial Link
interconnections are based on the RocketIO standard used on Xilinx Virtex-II Pro
FPGAs. Rocket Serial Links uses Low Voltage Differential Signaling (LVDS).
The SMT381-VP uses a subset of the RSL specification. Four RSLs are combined to
form a 10GBit/s RSLCC. One RSLCC per DAC channel is implemented on the
SMT381-VP. The RSLCC is thus capable to transfer a raw data stream to the DAC in
real time.
SHB
A
SHB
B
Bottom Primary TIM Connector
RSL
A
Daughter Card Expansion Connector
Top Primary TIM Connector
Daughter Card
Power Conn
RSL
B
The connector used for the RSL interface is a 0.8mm pitch differential Samtec
connector. The part number for this connector is: QSE-014-01-F-D-DP-A. The RSL
connector takes the place of the optional 3rd and 4th SHB connector on a TIM module.
The following diagram shows the position of the RSL connectors on the SMT381-VP:
Samsung
DDR266 SDRAM
Samsung
DDR266 SDRAM
Power
Figure 13. Rocket Serial Link Interface.
There are two additional RSL footprints underneath the module (by default not
mounted) in the same place as top RSL connectors. By mounting these two
connectors and not the top two it is possible to plug the SMT381-VP straight onto an
RSL enabled carrier without having to interconnect the links with cables.
24
68
13
57
RSL A
Pin No
Pin Name
Dir
Signal Description
Pin No
Pin Name
Signal Description
Carrier / Other Module to SMT381-VP
Dir
SMT381-VP to Carrier / Other Module
1
RxLink0p
Receive Link 0, positive
2
TxLink0p
Transmit Link 0, positive
3
RxLink0n
Receive Link 0, negative
4
TxLink0n
Transmit Link 0, negative
Dir
Carrier / Other Module to SMT381-VP
Dir
SMT381-VP to Carrier / Other Module
5
RxLink1p
Receive Link 1, positive
6
TxLink1p
Transmit Link 1, positive
7
RxLink1n
Receive Link 1, negative
8
TxLink1n
Transmit Link 1, negative
Dir
Carrier / Other Module to SMT381-VP
Dir
SMT381-VP to Carrier / Other Module
9
RxLink2p
Receive Link 2, positive
10
TxLink2p
Transmit Link 2, positive
11
RxLink2n
Receive Link 2, negative
12
TxLink2n
Transmit Link 2, negative
Dir
Carrier / Other Module to SMT381-VP
Dir
SMT381-VP to Carrier / Other Module
13
RxLink3p
Receive Link 3, positive
14
TxLink3p
Transmit Link 3, positive
15
RxLink3n
Receive Link 3, negative
16
TxLink3n
Transmit Link 3, negative
Dir
Reserved
Dir
Reserved
17
Reserved
Reserved
18
Reserved
Reserved
19
Reserved
Reserved
20
Reserved
Reserved
Dir
Reserved
Dir
Reserved
21
Reserved
Reserved
22
Reserved
Reserved
23
Reserved
Reserved
24
Reserved
Reserved
Dir
Reserved
Dir
Reserved
25
Reserved
Reserved
26
Reserved
Reserved
27
Reserved
Reserved
28
Reserved
Reserved
Figure 14. Rocket Serial Link Interface Connector and Pinout (RSL A).
RSL B
Pin No
Pin Name
Dir
1
Signal Description
Pin No
Pin Name
Signal Description
Carrier / Other Module to SMT381-VP
Dir
SMT381-VP to Carrier / Other Module
RxLink0p
Receive Link 0, positive
2
TxLink0p
Transmit Link 0, positive
3
RxLink0n
Receive Link 0, negative
4
TxLink0n
Transmit Link 0, negative
Dir
Carrier / Other Module to SMT381-VP
Dir
SMT381-VP to Carrier / Other Module
5
RxLink1p
Receive Link 1, positive
6
TxLink1p
Transmit Link 1, positive
7
RxLink1n
Receive Link 1, negative
8
TxLink1n
Transmit Link 1, negative
Dir
Carrier / Other Module to SMT381-VP
Dir
SMT381-VP to Carrier / Other Module
9
RxLink2p
Receive Link 2, positive
10
TxLink2p
Transmit Link 2, positive
11
RxLink2n
Receive Link 2, negative
12
TxLink2n
Transmit Link 2, negative
Dir
Carrier / Other Module to SMT381-VP
Dir
SMT381-VP to Carrier / Other Module
13
RxLink3p
Receive Link 3, positive
14
TxLink3p
Transmit Link 3, positive
15
RxLink3n
Receive Link 3, negative
16
TxLink3n
Transmit Link 3, negative
Dir
Reserved
Dir
Reserved
17
Reserved
Reserved
18
Reserved
Reserved
19
Reserved
Reserved
20
Reserved
Reserved
Dir
Reserved
Dir
Reserved
21
Reserved
Reserved
22
Reserved
Reserved
23
Reserved
Reserved
24
Reserved
Reserved
Dir
Reserved
Dir
Reserved
25
Reserved
Reserved
26
Reserved
Reserved
27
Reserved
Reserved
28
Reserved
Reserved
Figure 15. Rocket Serial Link Interface Connector and Pinout (RSL B).
3.11.2 RSL Cable Definition
The matching cable for the RSL connector is a Samtec High Speed Data Link Cable
(Samtec HFEM Series). The cable may be ordered with different length and mating
connector options. The following diagram shows such a typical cable:
Figure 16. Samtec HFEM Series Data Cable.
3.12 SHB Interface
The SMT381-VP implements a subset of the full SHB implementation. SHB A is
configured to receive 32-bit data words for channel A and SHB B is configured to
receive 32-bit data words for channel B. Both SHB interfaces are configured as
inputs only. Control and configuration data is received over ComPort 3. The SHB
interface is clocked by the SMT338-VP system clock of 125MHz.
The connector used for the SHB interface is a 0.5mm Samtec QSH Type connector.
The full part number for this connector is: QSH-030-01-L-D-A-K
The pinout information for the two possible configurations for both SHB connectors is
given in the following table:
246
135
SHB A and SHB B (X = A for SHB A, X = B for SHB B)
Pin No
Pin Name
Direction
Signal Description
Pin No
Pin Name
Direction
Signal Description
1
ChXClk
To 381
Ch X, Word Clock
31
ChXD29
To 381
Ch X, Word Data 29
2
ChXD0
To 381
Ch X, Word Data 0
32
ChXD30
To 381
Ch X, Word Data 30
3
ChXD1
To 381
Ch X, Word Data 1
33
ChXD31
To 381
Ch X, Word Data 31
4
ChXD2
To 381
Ch X, Word Data 2
34
ChXWen
To 381
Ch X, Write Enable
5
ChXD3
To 381
Ch X, Word Data 3
35
ChXReq
To 381
Request Bus
6
ChXD4
To 381
Ch X, Word Data 4
36
ChXAck
To 381
Acknowledge Bus
7
ChXD5
To 381
Ch X, Word Data 5
37
Reserved
Reserved
Reserved
8
ChXD6
To 381
Ch X, Word Data 6
38
Reserved
Reserved
Reserved
9
ChXD7
To 381
Ch X, Word Data 7
39
Reserved
Reserved
Reserved
10
ChXD8
To 381
Ch X, Word Data 8
40
Reserved
Reserved
Reserved
11
ChXD9
To 381
Ch X, Word Data 9
41
Reserved
Reserved
Reserved
12
ChXD10
To 381
Ch X, Word Data 10
42
Reserved
Reserved
Reserved
13
ChXD11
To 381
Ch X, Word Data 11
43
Reserved
Reserved
Reserved
14
ChXD12
To 381
Ch X, Word Data 12
44
Reserved
Reserved
Reserved
15
ChXD13
To 381
Ch X, Word Data 13
45
Reserved
Reserved
Reserved
16
ChXD14
To 381
Ch X, Word Data 14
46
Reserved
Reserved
Reserved
17
ChXD15
To 381
Ch X, Word Data 15
47
Reserved
Reserved
Reserved
18
ChXD16
To 381
Ch X, Word Data 16
48
Reserved
Reserved
Reserved
19
ChXD17
To 381
Ch X, Word Data 17
49
Reserved
Reserved
Reserved
20
ChXD18
To 381
Ch X, Word Data 18
50
Reserved
Reserved
Reserved
21
ChXD19
To 381
Ch X, Word Data 19
51
Reserved
Reserved
Reserved
22
ChXD20
To 381
Ch X, Word Data 20
52
Reserved
Reserved
Reserved
23
ChXD21
To 381
Ch X, Word Data 21
53
Reserved
Reserved
Reserved
24
ChXD22
To 381
Ch X, Word Data 22
54
Reserved
Reserved
Reserved
25
ChXD23
To 381
Ch X, Word Data 23
55
Reserved
Reserved
Reserved
26
ChXD24
To 381
Ch X, Word Data 24
56
Reserved
Reserved
Reserved
27
ChXD25
To 381
Ch X, Word Data 25
57
Reserved
Reserved
Reserved
28
ChXD26
To 381
Ch X, Word Data 26
58
Reserved
Reserved
Reserved
29
ChXD27
To 381
Ch X, Word Data 27
59
Reserved
Reserved
Reserved
30
ChXD28
To 381
Ch X, Word Data 28
60
Reserved
Reserved
Reserved
Figure 17. SHB Connector Pinout.
4 Firmware Description
4.2 Configuring the FPGA
The default for the FPGA configuration mode is using ComPort3. Configuring the
FPGA from ComPort 3 makes it possible not to have to use a JTAG cable. Having a
direct ComPort link enhances debugging and testing and therefore reduces the
products time to market.
The configuration data can be downloaded into a DSP TIM module external memory
(SMT6001) along with the DSP application, or configuration data can be sent from a
PC application using a Sundance carrier with a DSP host (SMT6500).
The bitstream is presented on ComPort 3 and the microcontroller embedded on the
SMT381-VP provides the mechanism to deliver it to the Virtex-II Pro device.
After configuration the ComPort is available to the FPGA for data transfers.
4.3 Setting up the FPGA
•
•
•
Configure the FPGA over ComPort 3 like described above
Initialize the SMT381-VP registers with the required values. See Control
Register Settings section underneath for the description of these registers
Select the data source to the DAC.
5 Control Register Settings
The Control Registers in the SMT381 example firmware control the complete
functionality of the SMT381-VP. These Control Registers are setup via ComPort 3.
The settings of the DAC, the trigger settings, the clock settings, the configuration of
the SHB and RSL interfaces and the internal FPGA data path settings can be
configured via the Control Registers.
5.1 Control Packet Structure
The data passed on to the SMT381 over the ComPorts must conform to a certain
packet structure (for compatibility with example firmware). Only valid packets will be
accepted and only after acceptance of a packet will the appropriate settings be
implemented. Each packet will start with a certain command indicating a write (0x1)
or a read (0x2). The address to write the data payload into (or where to read from)
will follow next. After the address the data will follow.
A 32-bit packet is received on ComPort3 and decoded. A write command will write
data into a register. A read command will request data from the FPGA. Once the data
is collected it will be transmitted over ComPort3. When issuing a read command the
return value must first be received before issuing the next read command.
All maximum size of registers that can be written to or read is 16 Bits. When
performing a read bits 31 downto 16 will reflect the command and address. The lower
16 bits will contain the actual data.
This structure is illustrated in the following figure:
Byte Content
Byte
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
3
Cmnd 3
Cmnd 2
Cmnd 1
Cmnd 0
Address
11
Address
10
Address 9
Address 8
2
Address 7
Address 6
Address 5
Address 4
Address 3
Address 2
Address 1
Address 0
1
Data 15
Data 14
Data 13
Data 12
Data 11
Data 10
Data 9
Data 8
0
Data 7
Data 6
Data 5
Data 4
Data 3
Data 2
Data 1
Data 0
Or
31 .. 28
Command
27 .. 24
23 .. 20
19 .. 16
15 .. 12
Address
11 .. 8
Data MSB
Figure 18. Setup Packet Structure.
The defined commands are:
Command Value
Command Description
0x0
Reserved
0x1
FGPA Write
0x2
FPGA Read
0x3
Reserved
0x4
Reserved
0x5
Reserved
0x6
Reserved
0x7
Reserved
0x8
Reserved
0x9
Reserved
0xA
Reserved
0xB
Reserved
0xC
Reserved
0xD
Reserved
0xE
Reserved
0xF
Reserved
Figure 19. Packet Structure – Defined Commands.
7 .. 4
3 .. 0
Data LSB
5.2 Reading and Writing Registers
Control packets are sent to the SMT381-VP over ComPort 3. This is a bi-directional
interface and data can be sent to the SMT381-VP over ComPort 3 and also received
over it. ComPort 3 is used to write control information to the SMT381-VP. Data is
written by sending a ‘Write Packet’ (Command 0x1). Data is read by first writing a
‘Read Request’ (Command 0x2) packet containing the address to be read over
ComPort 3. The SMT381-VP will collect the required data and send a ‘Read Packet’
out over ComPort 3 containing the requested data. The format of a ‘Read Packet’ is
the same as that of a write packet. (For the example firmware ComPort 3 is the
designated communications port on the SMT381-VP. This ComPort may however be
connected to any ComPort on the Host.)
1) Write Packet (0x1), Or Read Request Packet (0x2)
Byte 0
Byte 1
Byte 3
Byte 4
Data LSB
Data MSB
Address
Address / Command
ComPort 3
ComPort 3
Host
SMT391-VP
2) Read Packet
Byte 0
Byte 1
Byte 3
Byte 4
Data LSB
Data MSB
Address
Address / Command
Figure 20. Control Register Read Sequence.
Example 1:
Sending 0x1001FFFF over ComPort3 from the Host to the SMT381-VP will Write, to
Address 0x001, Data FFFF
Example 2:
Sending 0x2801xxxx over ComPort3 from the Host to the SMT381-VP will request a
Read, from Address 0x801. Once this command is received by the SMT381-VP, the
requested data will automatically be transmitted back over ComPort 3, following the
same packet structure.
5.3 Memory Map
The write packets must contain the address where the data must be written to and
the read packets must contain the address where the required data must be read.
The following figure shows the memory map for the writable and readable Control
Registers on the SMT381-VP:
Write Side
Address
Register
Read Side
Address
Register
0x000
Reset Register
0x000
FirmwareVersion
0x001
ComInScratchReg0
0x001
ComOutScratchReg0
0x002
ComInScratchReg1
0x002
ComOutScratchReg1
0x003
Reserved
0x003
Reserved
0x004
Reserved
0x004
Reserved
0x005
Reserved
0x005
Reserved
0x006
Reserved
0x006
Reserved
0x007
Reserved
0x007
Reserved
0x008
Reserved
0x008
Reserved
0x009
Enable Register
0x009
Reserved
0x00A
Reserved
0x00A
Reserved
0x00B
Reserved
0x00B
Reserved
0x00C
Reserved
0x00C
Reserved
0x00D
Reserved
0x00D
Reserved
0x00E
Reserved
0x00E
Reserved
0x00F
Reserved
0x00F
Reserved
0x010
Reserved
0x010
Reserved
0x011
Reserved
0x011
Reserved
0x012
Reserved
0x012
Reserved
0x013
Reserved
0x013
Reserved
0x014
Reserved
0x014
Reserved
0x015
Reserved
0x015
Reserved
0x016
Reserved
0x016
Reserved
0x017
Reserved
0x017
Reserved
0x018
Reserved
0x018
Reserved
0x019
Reserved
0x019
Reserved
0x01A
Reserved
0x01A
Reserved
0x01B
Reserved
0x01B
Reserved
0x01C
Reserved
0x01C
Reserved
0x01D
Reserved
0x01D
Reserved
0x01E
Reserved
0x01E
Reserved
0x01F
Reserved
0x01F
Reserved
0x020
Reserved
0x020
Smt338AirTempReg
0x021
Reserved
0x021
Smt338DiodeTempReg
0x022
Reserved
0x022
Smt338SerialNoA (Not Available)
0x023
Reserved
0x023
Smt338SerialNoB (Not Available)
0x024
Reserved
0x024
Smt338SerialNoC (Not Available)
0x025
Reserved
0x025
Smt338SerialNoD (Not Available)
0x026
Reserved
0x026
Reserved
0x027
Reserved
0x027
Reserved
0x028
Reserved
0x028
DaughterCardAirTempReg
0x029
Reserved
0x029
DaughterCardDiodeTempReg
0x02A
Reserved
0x02A
DaughterCardSerialNoA (Not Available)
0x02B
Reserved
0x02B
DaughterCardSerialNoB (Not Available)
0x02C
Reserved
0x02C
DaughterCardSerialNoC (Not Available)
0x02D
Reserved
0x02D
DaughterCardSerialNoD (Not Available)
0x02E
Reserved
0x02E
Reserved
0x02F
Reserved
0x02F
Reserved
0x030
Reserved
0x030
Reserved
0x031
Reserved
0x031
Reserved
0x032
Reserved
0x032
Reserved
0x033
Reserved
0x033
Reserved
0x034
Reserved
0x034
Reserved
0x035
Reserved
0x035
Reserved
0x036
Reserved
0x036
Reserved
DAC Module Specific
DAC Module Specific
0x800
Smt381AdjClkCntrlReg *
0x800
Reserved
0x801
Smt381ClockSourceSelect
0x801
Reserved
0x802
Smt381Pll_IfR_Reg1
0x802
Reserved
0x803
Smt381Pll_IfR_Reg2
0x803
Reserved
0x804
Smt381Pll_IfN_Reg1
0x804
Reserved
0x805
Smt381Pll_IfN_Reg2
0x805
Reserved
0x806
Smt381Pll_RfR_Reg1
0x806
Reserved
0x807
Smt381Pll_RfR_Reg2
0x807
Reserved
0x808
Smt381Pll_RfN_Reg1
0x808
Reserved
0x809
Smt381Pll_RfN_Reg2 *
0x809
Reserved
0x80A
Reserved
0x80A
Reserved
0x80B
Reserved
0x80B
Reserved
0x80C
Reserved
0x80C
Reserved
0x80D
Reserved
0x80D
Reserved
0x80E
Data Source Selection
0x80E
Reserved
0x80F
Reserved
0x80F
Reserved
0x900
Smt381SetupData
0x900
Reserved
0x901
Smt381DacAddress
0x901
Reserved
0x902
Smt381DacData(LSB)
0x902
Reserved
0x903
Smt381DacData
0x903
Reserved
0x904
Smt381DacData
0x904
Reserved
0x905
Smt381DacData(MSB)
0x905
Reserved
* Write Data Valid pulse is generated when this register is written to.
Table 3. Register Memory Map (DAC registers not yet fixed in firmware)
For registers larger than 16 bits with an LSB and MSB part always write the LSB part
first and then the MSB.
5.4 Register Descriptions
5.4.1 The Reset Register (Write Add 0x000)
The reset register is used to reset the various blocks constituting the FPGA.
Writing a ‘1’ will put the selected block in the reset state. Writing a ‘0’ will release the
reset.
31 .. 28
27 .. 24
23 .. 20
19 .. 16
15 .. 9
8 .. 0
Command
Address
Data MSB
Data LSB
1
0x000
Reserved
Reset command
Figure 21. Reset Register (Write Only).
Reset command:
Bit 0: DCM Reset.
Bit 1: DAC Reset.
Bit 3: SHBA Interface Reset.
Bit 4: SHBB Interface Reset.
Bit 5: RSLA Reset.
Bit 6: RSLB Reset.
Bit 7: SHBA Pattern FIFO Reset.
Bit 8: SHBB Pattern FIFO Reset.
Bit 9: SHBA Direct FIFO Reset.
Bit 11: SHBB Direct FIFO Reset.
5.4.2 Firmware Version Register (Read Add 0x000)
A read from address 0x000 will display the firmware version register. The value of
this register is hard coded during VHDL compiles and must be stepped for each new
version of the firmware. Even though 32 bits are read over the ComPort, the firmware
version register is a 16 bit register (16 least significant bits of the returned value).
Read Request Format:
31 .. 28
27 .. 24
23 .. 20
19 .. 16
15 .. 12
11 .. 8
7 .. 4
3 .. 0
Command
Address
Data MSB
Data LSB
0x2
0x000
xx
xx
Read Response Format:
31 .. 28
27 .. 24
23 .. 20
19 .. 16
15 .. 12
11 .. 8
7 .. 4
3 .. 0
Command
Address
Data MSB
Data LSB
0x2
0x000
Firmware Version
Firmware Version
Figure 22. Firmware Version Register (Read Only).
5.4.1 The Enable Register (Write Add 0x009)
The reset register is used to reset the various blocks constituting the FPGA.
Writing a ‘1’ will put the selected block in the reset state. Writing a ‘0’ will release the
reset.
31 .. 28
27 .. 24
23 .. 20
19 .. 16
15 .. 9
8 .. 0
Command
Address
Data MSB
Data LSB
1
0x009
Reserved
Enable command
Figure 23. Enable Register (Write Only).
Enable command:
Bit 0: Enable SHB to DPRAM mode.
Bit 1: Enable Look Up Table mode.
Bit 3: Enable RSL to DAC mode.
Bit 4: External Triggers.
5.4.3 Temperature Registers (Read Add 0x020, 0x021, 0x028,
0x029)
There are four temperature registers. Each register is 16 bits long. When the bit
value of the register is converted to a decimal number, that number is the
temperature in degrees Celsius.
Read Request Format:
31 .. 28
27 .. 24
Command
23 .. 20
19 .. 16
15 .. 12
11 .. 8
7 .. 4
3 .. 0
Address
Data MSB
Data LSB
0x2
0x020 (Smt338AirTempReg) (1)
xx
xx
0x2
0x021 (Smt338DiodeTempReg) (2)
xx
xx
0x2
0x028 (DaughterCardAirTempReg) (3)
xx
xx
0x2
0x029 (DaughterCardDiodeTempReg) (4)
xx
xx
(1)
- SMT338-VP Air Temperature on Top of PCB
(2)
– SMT338-VP FPGA temperature on Bottom of PCB
(3)
– SMT381 Air Temperature on Bottom of PCB
(4)
– SMT381 ADC temperature on Top of PCB
Read Response Format:
31 .. 28
Command
27 .. 24
23 .. 20
Address
19 .. 16
15 .. 12
Data MSB
11 .. 8
7 .. 4
3 .. 0
Data LSB
0x2
0x020
SMT338-VP
Air Temperature
0x2
0x021
SMT338-VP
Diode Temperature
0x2
0x028
SMT381
Air Temperature
0x2
0x029
SMT381
Diode Temperature
Figure 24. Temperature Registers (Read Only).
5.4.4 Serial Number Registers (Read Add 0x022 – 0x025 and 0x02A
– 0x02D) – Not implemented in default MSP430 and FPGA designs.
There is a unique silicon serial number IC on both the SMT338-VP and the SMT381.
Each serial number is 64 bits long and is thus requires four 16 bit registers to store
the value. This option is not implemented in the current MSP430 and FPGA designs.
The components are fitted on the boards.
Read Request Format:
31 .. 28
27 .. 24
23 .. 20
19 .. 16
15 .. 12
11 .. 8
7 .. 4
3 .. 0
Command
Address
Data MSB
Data LSB
0x2
0x022 (Smt338SerialNoA)
xx
xx
0x2
0x023 (Smt338SerialNoB)
xx
xx
0x2
0x024 (Smt338SerialNoC)
xx
xx
0x2
0x025 (Smt338SerialNoD)
xx
xx
0x2
0x02A (DaughterCardSerialNoA)
xx
xx
0x2
0x02B (DaughterCardSerialNoB)
xx
xx
0x2
0x02C (DaughterCardSerialNoC)
xx
xx
0x2
0x02D (DaughterCardSerialNoD)
xx
xx
Figure 25. Serial Number Registers (Read Only).
Read Response Format:
31 .. 28
27 .. 24
23 .. 20
19 .. 16
15 .. 12
11 .. 8
7 .. 4
3 .. 0
Command
Address
Data MSB
Data LSB
0x2
0x022
SMT338-VP Serial No
Byte A
0x2
0x023
SMT338-VP Serial No
Byte B
0x2
0x024
SMT338-VP Serial No
Byte C
0x2
0x025
SMT338-VP Serial No
Byte D
0x2
0x02A
SMT381 Serial No
Byte A
0x2
0x02B
SMT381 Serial No
Byte B
0x2
0x02C
SMT381 Serial No
Byte C
0x2
0x02D
SMT381 Serial No
Byte D
Figure 26. Serial Number Registers Cont. (Read Only).
5.4.5 DAC Clock Source Registers (Write Add 0x801)
The A and B channels of the DAC can receive a clock from the on-board VCO, the
on-board clock synthesizer, or from an external clock (RF or ECL). The following
table shows the different combinations for setting up the SMT381 clock tree.
Register
Value
A Channel Clock Source
B Channel Clock Source
0x0000
On-board VCO
On-board VCO
0x0001
On-board Clock Synthesizer
On-board Clock Synthesizer
0x0002
External ECL Clock
External ECL Clock
0x0003
External ECL Clock
External ECL Clock
0x0004
On-board VCO
On-board VCO
0x0005
On-board Clock Synthesizer
On-board Clock Synthesizer
0x0006
External RF Clock
External RF Clock
0x0007
External RF Clock
External RF Clock
Figure 27. Clock Source Selection Table (Write Only).
31 .. 28
27 .. 24
23 .. 20
19 .. 16
15 .. 12
11 .. 8
7 .. 4
3 .. 0
Command
Address
Data MSB
Data LSB
0x1
0x801
0x00
Clock Register Value
Figure 28. Clock Source Register (Write Only).
5.4.6 Clock Synthesizer Setup Register (Write Add 0x800)
This register sets up the frequency of the clock synthesizer on the SMT381. Any
write operation to this register will trigger the clock synthesizer interface control logic
to initialize the clock synthesizer with its new value.
31 .. 28
27 .. 24
23 .. 20
19 .. 16
15 .. 12
11 .. 8
7 .. 4
3 .. 0
Command
Address
Data MSB
Data LSB
0x1
0x800
Data
Data
Figure 29. Clock Synthesizer Setup Register (Write Only).
For a detailed description of the configurable bits in the Clock Synthesizer register
please refer to the “Clock Synthesizer” section under “Firmware Building Blocks” at
the end of this document.
5.4.7 PLL Setup Registers (Write Add 0x802 – 0x809)
These registers set up the frequency of the PLL circuit on the SMT381. There are
two sets of registers – one set for setting up the IF side of the PLL, and the other set
for setting up the RF side of the PLL. The IF side is unconnected, while the RF side
is connected to a 600 – 1200 MHz VCO circuit which is divided by two before
entering the DAC at a frequency of 300 – 600MHz. All registers must be initialized,
and only when writing to the final register will both the IF and RF side be configured
to their new values.
31 .. 28
27 .. 24
23 .. 20
19 .. 16
15 .. 12
11 .. 8
7 .. 4
Data MSB
3 .. 0
Command
Address
Data LSB
0x1
0x802
Not Used
Not Used
0x1
0x803
Not Used
Not Used
0x1
0x804
Not Used
Not Used
0x1
0x805
Not Used
Not Used
0x1
0x806
Smt381Pll_RfR_Reg1
Smt381Pll_RfR_Reg1
0x1
0x807
Smt381Pll_RfR_Reg2
Smt381Pll_RfR_Reg2
0x1
0x808
Smt381Pll_RfN_Reg1
Smt381Pll_RfN_Reg1
0x1
0x809
Smt381Pll_RfN_Reg2
Smt381Pll_RfN_Reg2
Figure 30. PLL Setup Registers (Write Only).
For a detailed description of the configurable bits in the PLL registers please refer to
the “PLL Configuration” section under “Firmware Building Blocks” at the end of this
document.
5.4.8 Data Source Selection (Write Add 0x80E)
This register selects between four data sources.
31 .. 28
27 .. 24
23 .. 20
Command
Address
0x1
0x80E
19 .. 16
15 .. 12
11 .. 8
7 .. 4
Data MSB
3 .. 0
Data LSB
Not Used
6..4 : Channel B selection
2..0 : Channel A selection
What follows applies for Channel A and B:
Register
Value
Channel Data Source
0x0
Look Up Table - A Fixed sine period is
stored into a block of ROM as 32 samples.
0x5
SHB to DPRAM – In this mode, 32 samples
per channel are loaded via SHB to be played
back continuously and sent to the DAC.
0x6
SHB to DAC – Samples coming the SHBs
are routed directly to the DAC. A 256-word
(32 bits) FIFO connects the SHB interface to
the DAC.
0x7
RSL to DAC – Samples coming out of the
RSL interface are routed to the DAC. This is
the fastest way. A 64-word (64 bits each)
FIFO converts the data into the right format.
Figure 31 – Data Source Selection.
When using, the Memory available inside the DAC, any source can be selected. It
will not affect the DAC. It is recommended to keep the selected source into reset.
5.4.9 DAC Setup Registers (Write Add 0x900 – 0x905)
These registers configure the internal functionality of the DAC on the SMT381. There
are six registers – 4 data registers an address register and setup register. The
address and setup registers must be set up before the data registers. Once the data
registers are written to the data, address and setup information contained in all the
registers will be transferred to the DAC over a serial interface.
31 .. 28
27 .. 24
23 .. 20
Command
Address
0x1
0x900
19 .. 16
15 .. 12
11 .. 8
Data MSB
Smt381SetupData
7 .. 4
3 .. 0
Data LSB
Smt381SetupData
0x1
0x901
Smt381DacAddress
Smt381DacAddress
0x1
0x902
Smt381DacData(LSB)
Smt381DacData(LSB)
0x1
0x903
Smt381DacData
Smt381DacData
0x1
0x904
Smt381DacData
Smt381DacData
0x1
0x905
Smt381DacData(MSB)
Smt381DacData(MSB)
Figure 32. DAC Setup Registers (Write Only).
For a detailed description of the configurable bits in the DAC registers please refer to
the “DAC Configuration” section under “Firmware Building Blocks” at the end of this
document.
6 PCB Layout
6.1 SMT381 PCB View
The following figure shows the Final Placement of Components for the SMT381 PCB
layout.
Figure 33. SMT381 PCB layout - TOP.
Figure 34. SMT381 PCB layout – BOTTOM.
6.2 Assembly Drawings
Figure 35. SMT381 Top Assembly Drawings.
Figure 36. SMT381 Bottom Assembly Drawings.
Connector descriptions:
J1 - MMBX STRAIGHT PCB JACK (FEMALE) – DAC clock output (Differrential).
J2 - MMBX STRAIGHT PCB JACK (FEMALE) – Channel A analog positive output.
J3 - MMBX STRAIGHT PCB JACK (FEMALE) – Channel B analog positive output.
J4 - MMBX STRAIGHT PCB JACK (FEMALE) – Ext ECL clock input (Differential).
J5 - MMBX STRAIGHT PCB JACK (FEMALE) – Ext RF clock input.
J6 - 0.5mm Pitch Differential Pair Connector QSH(-DP) Series.
J7 - BKT SERIES POLARISED HEADER - 33-WAY.
J8 - SMT398-PRO JTAG CONNECTOR.
J9 - MOLEX 2 PIN 90DEG THP, 1.25mm FAN CONN.
J10 - MMBX STRAIGHT PCB JACK (FEMALE) – Ext Trigger A (Differential).
J11 - MMBX STRAIGHT PCB JACK (FEMALE) – Ext Trigger B (Differential).
J12 - MMBX STRAIGHT PCB JACK (FEMALE) – Channel A analog negative output
(not used).
J13 - MMBX STRAIGHT PCB JACK (FEMALE) – Channel B analog negative output
(not used).
6.3 SMT338-VP Assembly Drawings
The following figures show the top and bottom assembly drawings of the SMT338VP.
Figure 37. Main Module Top Assembly Drawing.
Figure 38. Main Module Bottom Assembly Drawing.
6.4 SMT381 PCB View
If the SMT381-VP is mated with a PCI carrier two PCI slots will be required for the
Module + Carrier combination. If the SMT381-VP is mated with a cPCI carrier the
Module + Carrier will require two cPCI slots.
RF Daughtercard PCB
Inter PCB Connector
Only required for
debugging
JTAG
6.4mm
VCO 5.6mm
20.7 mm
Including
Heatsink
19.2 mm
Excluding
Heatsink
DAC - 1.6MM
SHB
RSL
FPGA
T
Max PCB
Thickness
is 1.6mm
Power
Stand-off
Module PCB
Figure 39. Side view of SMT381-VP (Height).
Figure 40. Side view of SMT381-VP.
TIM Connectors
T
The height
between the
two PCBs is
5mm
Figure 41. Top view of SMT381-VP.
The following diagram indicates the location of all the important connectors and
components on the SMT381 (Rev 1) PCB.
Figure 42. Connector Location on SMT381.
Diagram
Ref
Pcb
RefDes
Description
Notes
A
J11
External Trigger B Channel
LVPECL Signal. Positive on inside of connector.
Negative on outside of connector.
B
J10
External Trigger A Channel
LVPECL Signal. Positive on inside of connector.
Negative on outside of connector.
C
J13
DAC Output B Channel (neg)
Analog Signal. Signal on inside of connector. GND on
outside of connector. For DC Coupling only (differential
signal, split over both connectors).
D
J3
DAC Output B Channel (pos)
Analog Signal. Signal on inside of connector. GND on
outside of connector. For AC Coupling (single ended),
and pos side of DC coupling (differential)
E
J12
DAC Output A Channel (neg)
Analog Signal. Signal on inside of connector. GND on
outside of connector. For DC Coupling only (differential
signal, split over both connectors).
F
J2
DAC Output A Channel (pos)
Analog Signal. Signal on inside of connector. GND on
outside of connector. For AC Coupling (single ended),
and pos side of DC coupling (differential).
G
J1
DAC Test Clock Output
LVPECL output test clock. Copy of clock going to DAC.
Postive on inside of connector, negative on outside of
connector. Used for verification of the clock going to the
DAC.
H
J5
External RF clock input
External Analog input Clock to DAC. Clock on inside of
connector, DGND on the outside of connector.
I
J4
External ECL clock input
External ECL input Clock to DAC. Positive on inside of
connector, negative on the outside of connector.
Table 4. Table of Connector Locations on SMT381.
Diagram
Ref
Pcb
RefDes
Description
Notes
J
J8
FPGA / MSP JTAG Connector
FPGA / MSP430 on SMT338-VP JTAG Chain. Only
routed down to SMT338-VP. Use for easy access
without having to remove the SMT381.
K
U9
Fujitsu DAC
DAC Requires heat-sink with air-flow cooling in a
system setup.
L
TRANS2
M/A Com TP101 Transformer
By default the SMT381 analog input is AC coupled
through a twisted pair balum transformer (differential to
single ended). It is possible to change this configuration
to DC coupled by taking out the transformer and
inserting some resistors on the board.
M
TRANS1
M/A Com TP101 Transformer
By default the SMT381 analog input is AC coupled
through a twisted pair balum transformer (differential to
single ended). It is possible to change this configuration
to DC coupled by taking out the transformer and
inserting some resistors on the board.
N
VCO1
UMC 600 – 1200MHz VCO
System Clock for the DAC. VCO Requires heat-sink
with air-flow cooling in a system setup.
O
U31
Clock Synthesizer
950MHz
50
–
Test Clock for DAC. The range of this clock is wider
than the operating range of the DAC.
Table 5. Table of Component Locations on SMT381.
7 General Properties
7.1 FPGA Mounted on SMT338-VP
All FPGA interfaces on the SMT338-VP require 508 IOs. The following table is a
summary of the amount of IOs available on Xilinx Virtex-II Pro devices.
Size (mm)
XC2VP7
FF672
27 x 27
396 / 8
FF896
31 x 31
396 / 8
FF1152
35 x 35
XC2VP20
XC2VP30
556 / 8
556 / 8
564 / 8
644 / 8
XC2VP40
XC2VP50
692 / 12
692 / 16
Table 6. Virtex-II Pro IO Count.
By default all SMT338-VPs are assembled with VP30 devices. The example firmware
is also for a VP30 FPGA. If a VP7 is mounted some of the SHB interface IOs and the
DDR SDRAM memory interface will be lost.
7.2 Design Resource Usage
The following table is a summary of the FPGA resources used by the demo design
that comes with the SMT381-VP (compiled for a VP30 device).
Resource
Number of External DIFFMs
Utilization
35 out of 276
Number of External DIFFSs
35 out of 276
12%
Number of External IOBs
125 out of 556
22%
Number of LOCed External IOBs
Percentage
12%
100%
Number of RAMB16s
20 out of 136
14%
Number of SLICEs
6696 out of 13696
51%
Number of BUFGMUXs
8 out of 16
50%
Number of DCMs
2 out of 8
25%
Table 7. Virtex-II Pro Device Utilization Summary.
7.3 Power Supply
The following voltages are required by the SMT381 and must be supplied over the
daughter card power connector.
Voltage
D+3V3_IN
Current Required
2.0 A
D+5V0_IN
500 mA
D+12V0_IN
250 mA
D-12V0_IN
250 mA
DGND
Table 8. SMT381 Power Supply Voltages.
The following voltages are required by the SMT381-VP and must be supplied over
the TIM connectors and TIM mounting hole
Voltage
D+3V3_IN
Current Required
4.0 – 6.0 A
D+5V0_IN
4.0 A
D+12V0_IN
500 mA
D-12V0_IN
500 mA
DGND
Table 9. SMT381-VP Power Supply Voltages.
The following table lists the internal SMT381 voltages that are derived from the
voltages that are provided over the daughter card power connector.
Voltage
D+3V3
D+1V8
A+3V3
VCO+5V0
VCO+12V0
ECL-5V2
AGND
Description
Derived from D+3V3_IN
Derived from D+3V3 on SMT381
Derived from D+3V3_IN
Derived from D+5V0_IN
Derived from D+12V0_IN
Derived from D-12V0_IN
Derived from DGND
Table 10. Internal Power Supply Voltages.
7.4 Module Dimensions
The following table lists the dimensions for the SMT381 and the SMT381-VP.
Description
Module Dimensions (Only SMT381)
Module Dimensions (SMT381-VP)
Weight
Value
Width: 63.5 mm
Length: 106.68 mm
Height: 21mm (Maximum)
Width: 63.5 mm
Length: 106.68 mm
Height: 21mm (Maximum)
SMT381 : 36.71grams
SMT381-VP : 94.30 grams
SMT381-VP (including fittings) :
97.40 grams
Table 11. SMT381-VP Dimensions.
7.5 FPGA/JTAG Connector
The connector present on the SMT381-VP is used for both the FPGA and MSP430
JTAG chain as illustrated in the following figure:
Figure 43. FPGA/JTAG connector for the SMT381-VP.
8 System Setup
8.1 How to connect the SMT381 to SMT338-VP
The following diagram shows both the SMT338-VP and the SMT381 (together they
form the SMT381-VP). There are four mounting holes on each board. The two larger
holes on the SMT338-VP are the TIM mounting holes and provide the SMT338-VP
with 3.3V. The two smaller holes add extra stability when the SMT381 is plugged
onto the SMT338-VP (One of these holes on the SMT338-VP carries 1.5V and the
other one 2.5V. These voltages are however not used on the SMT381-VP. For this
reason it is thus safer to use Nylon screws).
Here is the example on how to mount an SMT390 onto an SMT338-VP:
Figure 44. SMT381 to SMT338-VP Interconnection.
The following fixings are required to connect the SMT381 to the SMT338-VP:
Figure 45. Components Used to Connect the SMT381 to the SMT338-VP.
•
•
•
•
•
•
•
First fit two Nylon screws (M2 x 10), pointing out (the head of the screws on
the bottom side of the SMT338-VP).
Then fit four M2 nuts on each screw.
Place the SMT338-VP on the second TIM site (TIM 1 is for the Host) of a
Sundance carrier (like the SMT310Q)
Fit the two metal pillars to the TIM mounting holes to give the SMT338-VP
3.3V from the carrier.
Place the SMT381-VP on top of the SMT338-VP and make sure that both
modules fit firmly (the SMT381 does not need 3.3V of it’s mounting hole).
Fit two M2 nuts on the Nylon screws and two M3x4 screws in the 3.3V pillars.
Connect ComPort3 of the SMT381-VP to an available ComPort on the Host
module (eg ComPort 0).
Figure 46. Fitting of Nylon Screws and Nuts to the SMT338-VP.
Figure 47. Securing the SMT338-VP onto a Sundance Carrier.
Figure 48. Connecting the SMT381 to the SMT338-VP.
9 Module Performance
9.1 Introduction
This section shows data captures from an SMT381-VP. The first set of captures were
done using the LVDS data interface to clock data to the DAC. The second set uses
the internal waveform memory to generate the analog output. In Appendix A at the
end of this document the procedure for setting up the waveform is described.
9.2 LVDS Data interface
Figure 49. Time View Captures of LVDS Interface Data.
Figure 50. Measurements of Time View Capture.
9.3 Waveform Memory
In the following captures the waveform memory is set up for a cyclic run of 8 samples
per channel and a sinus wave programmed into the memory. One complete cycle of
the wave is loaded into the memory, resulting in a waveform being generated at 1/8th
of the sample frequency. The DAC sample frequency is double that of the clock
supplied to the DAC. So for eg if a 500MHz clock is given to the DAC with the
waveform memory initialized as described above the DAC sample frequency will be
1000MHz and the generated wave will be 125MHz (1000MHz divided by 8).
Figure 51. Waveform Memory - Time View Capture – 1000MHz sample frequency
(500MHz VCO Clock) – 125MHz analog output.
Figure 52. Measurements of Capture – 1000MHz sample frequency (500MHz VCO
Clock) – 125MHz analog output.
Figure 53. Waveform Memory - FFT – 1000MHz sample frequency (500MHz VCO Clock)
– 125MHz analog output – Channel A.
Figure 54. Waveform Memory - FFT – 1000MHz sample frequency (500MHz VCO Clock)
– 125MHz analog output – Channel B.
Figure 55. Waveform Memory - FFT – 1400MHz sample frequency (700MHz Synthesizer
Clock) – 175MHz analog output – Channel A.
Figure 56. Waveform Memory - FFT – 1400MHz sample frequency (700MHz Synthesizer
Clock) – 175MHz analog output – Channel B.
Figure 57. Waveform Memory - FFT – 600MHz sample frequency (300MHz VCO Clock) –
75MHz analog output – Channel A.
Figure 58. Waveform Memory - FFT – 600MHz sample frequency (300MHz VCO Clock) –
75MHz analog output – Channel B.
10 Firmware Building Blocks
10.1 Introduction
This section explains some of the basic low level firmware blocks that come with the
example firmware design of the SMT381-VP.
10.2 Clock Synthesizer
A three wire uni-directional control interface is implemented between the FPGA of the
SMT338-VP and the clock synthesizer present on the SMT381.
One 16 bit register in the SMT338-VP firmware is used for the setup of the clock
synthesizer. The data word needed for the setup of the synthesizer is only 14 bits
long - thus the 16 bit register is sufficient to receive data from the ComPort in one
write cycle from the Host. When the ComPort receives the data for the clock
synthesizer register it configures the internal firmware register accordingly and
asserts the enable pin on the Clock Synthesizer State Machine.
The Clock Synthesizer State Machine generates the handshaking signals to clock
data into the synthesizer. The synthesizer then generates an output clock depending
on the setup given by the user. The output of the Synthesizer is a LVPECL signal.
The Clock Synthesizer register (present on the SMT338-VP firmware side) is used
for the setup of the clock synthesizer on the SMT381. The table below shows the
setup of this register:
Clock Control Register
Byte
1
0
Bit 7
Bit 6
Do Not Care
Bit 5
Bit 4
Bit 3
Test Bits
Bit 2
Bit 1
Output Division
Bit 0
M Count
M Count
Figure 59. Clock Synthesizer Register.
As the ComPort bit-stream is 16 bits long both bytes are written simultaneously. The
most significant byte (Byte 1) contains the test bits, output division bits and one M
count bit. The test bits selects between various internal node values and is controlled
by the T[2:0] bits in the serial data stream (This feature is can be set up by the
FPGA, but the value of the Test output is not read by the FPGA). The node values
are shown in the table below.
Table 12. Clock Synthesizer Test Output.
Output division on the clock synthesizer is achieved by the two output division bits
found in the first byte of the clock control register. These configurations are
underneath:
Table 13. Clock Synthesizer Division Setup.
The M count bits are used to configure the clock output frequency given all the
constraints set by the hardware and the clock setup bits. The nine bits can be
programmed with any value from 200 – 400. All the setup bits are then used to
calculate the output with the following equation.
FXTAL = 16MHz (external oscillator)
N = Value in decimal, set up by the division bits.
M = Value in decimal, set up by the M count bits.
Figure 60. Clock Synthesizer Frequency Calculation.
For more information refer to the Micrel datasheets of this part.
10.3 DAC serial setup
A simple 4-wire serial control interface is used to control the DAC. The serial
interface uses pins SERIAL_IN, SERIAL_OUT, SERIAL_CLK and SERIAL_EN.
Programmed settings are stored in a number of registers which are individually
accessible using either a 7-bit (WMM Registers) or 10-bit (DAC Core Registers)
address/control word. Data may be written to or read from each of these registers.
The following figure shows the function timing diagrams for a ‘write’ and ‘read’
operation.
Figure 61. DAC serial write operation.
Figure 62. DAC serial read operation.
The DAC serial set up firmware uses four registers to interact with the DAC via the 4wire serial control. The registers are DACSerialSetupReg, DACSerialAddr,
DACDataReg and SerialOutReg. The first register is 3 bits long and influences the
behaviour of the state machine. There are three options for this register to be
configured which is shown in the table below.
Bit 2
Bit 1
Bit 0
No of Address and Data bits the state
machine will clock out
0
X
W/R
10 Address bits
28 Data bits
1
0
W/R
7 Address bits
28 Data bits
1
1
W/R
7 Address bits
64 Data bits
Table 14. Configuration of the DACSerialSetupReg register.
The W/R in the last bit selects between a ‘write’ and a ‘read’ cycle.
The following figure shows the DAC state machine.
Figure 63. State machine of the DAC for the SMT381.
The state machine works in 5 stages:
• Initialisation
• Address clocked out
• Clock out write or read bit
• Data clocked out
• End sequence
The first stage receives the update flag and then selects the amount of address bits
and data bits to clock out depending on the values loaded into the
DACSerialSetupReg register.
In the second stage the address stored in the DACSerialAddr is clocked out to the
DAC.
The third stage writes the ‘write’ or ‘read’ bit to the DAC. This bit is the least
significant bit in the DACSerialSetupReg register (DACSerialSetupReg(0)).
In the fourth stage the data present in the DACDataReg register is clocked to the
DAC.
Finally the last stage pulls the ENBALE pin low on the DAC which indicates the end
of the sequence. A few extra clock pulses are necessary after this to complete the
internal register programming.
10.4 PLL Configuration
The PLL 22-bit shift register is loaded via a microwire interface. This interface
consists of 3 wires. The shift register consists of a 20-bit Data[19:0] Field and a 2-bit
Address[1:0] Field. The Address Field is used to decode the internal control register
address. When LE transitions HIGH, data stored in the shift register is loaded into
one of 4 control registers depending on the state of the address bits. The MSB of
Data is loaded in first. The register is shown in the following figure.
Figure 64. Register Setup for PLL.
First off the LE line is pulled low and then the MSB of data is loaded onto the Data
line. The Clock line is then driven high and low and a new Data line value is clocked
into the Pll on each rising edge of the Clock line. The Data line is driven with the
registers setup and the Clock line driven high and low until the Data line has reached
the LSB. To end the sequence the LE line is pulled high.
There are two ways to operate the LE line as also shown in the figure below. The
figure also explains how to configure the device.
Figure 65. PLL Configuration Sequence.
The figure below explains the state diagram residing in the firmware design
(SMT338-VP’s Fpga). This design ultimately executes the procedures explained in
the previous figures and paragraph.
Figure 66. State Machine Driving the PLL Serial Interface.
11 Test Points
The following diagram shows all the Test points present on the board.
Figure 67. Test point locations on the SMT381.
TP1 – External Clock positive
TP2 – External Clock negative
TP3 – Daughter Card Connector test point
TP4 – Daughter Card Connector test point
TP5 – Daughter Card Connector test point
TP6 – Daughter Card Connector test point
TP7 – 1V8 test point
TP8 – 3V3_IN test point
TP9 – ECL 5V test point
TP10 – 3V3 test point
TP11 – ECL -5V2 test point
TP12 – Analog 3V3
TP13 – VCO 12V
TP14 – VCO 5V
TP15 – VCO Clock positive
TP16 – VCO Clock negative