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System Generator for DSP User Guide www.xilinx.com 101
UG640 (v 12.2) July 23, 2010
Design Styles for the DSP48
For synthesis to work, the circuit must be mappable to the DSP48 and signal bitwidths
must be less than the equivalent buses in the DPS48.
You should kept in mind that the logic synthesis tools are rapidly evolving and that
inferring DPS48 configurations is more of an art than a science. This means that some
mappable designs may not be mapped efficiently, or that the mapping results may not be
consistent. It will be necessary to inspect the post synthesis netlist using a tool similar to
Synplify Pro's gate-level technology viewer to determine if the design is being correctly
mapped. If not, it may be possible to recast it to be correctly inferred. A model of a fully
synthesizable FIR filter is located at the follwing pathname in the System Generator
software tree:
.../sysgen/examples/dsp48/synth_fir/synth_fir_tb.mdl
Designs that Use DSP48 and DSP48 Macro Blocks
DSP48 Block
The DSP48 block is effectively a wrapper for the DSP48 UNISIM primitive. Because of this,
any possible DSP48 design can be implemented. This low-level implementation however
requires an 11-bit binary opmode to be routed to the DSP48's control ports in order to
configure its function. The Constant
block has a special mode enabling it to generate a
DSP48 control field. The DSP48's parameters dialog box is used to configure the pipelining
mode of the DSP48 as well as the use of the DSP48's local interconnect buses named
PCOUT-PCIN and BCOUT-BCIN. You can try out the DSP48 block by opening the
simulink model that is located at the follwing pathname in the System Generator software
tree:
.../sysgen/examples/dsp48/dsp48_primitive.mdl
Dynamic Control of the DSP48
The DSP48 has the unique capability of being able to change its operation on a per cycle
basis. This is useful in applications where the DSP48 is used in a 'resource shared' mode
such as a FIR filter where multiple taps are implemented by the same multiplier. A simple
- Generator for 1
- Table of Contents 3
- About This Guide 9
- Conventions 10
- Preface: About This Guide 12
- Hardware Design Using System 13
- Generator 13
- A Brief Introduction to FPGAs 14
- Note to the DSP Engineer 18
- Note to the Hardware Engineer 18
- Algorithm Exploration 19
- System Generator Blocksets 21
- Xilinx Blockset 22
- Xilinx Reference Blockset 22
- Signal Types 23
- Timing and Clocking 24
- Rate-Changing Blocks 25
- Multirate Models 25
- Hardware Oversampling 26
- Asynchronous Clocking 26
- Synchronous Clocking 26
- The Clock Enables Option 27
- The Hybrid DCM-CE Option 27
- The Expose Clock Ports Option 28
- Synchronization Mechanisms 36
- Block Masks 37
- Parameter Passing 37
- Automatic Code Generation 39
- Simulink System Period 43
- Block Icon Display 43
- Viewing ISE Reports 44
- Compilation Results 44
- System Clock Period 46
- Multicycle Path Constraints 46
- Constraints Example 47
- Clock Handling in HDL 48
- HDL Testbench 50
- Compiling MATLAB into an FPGA 51
- Simple Arithmetic Operations 52
- Shift Operations 56
- Optional Input Ports 60
- Finite State Machines 62
- Parameterizable Accumulator 63
- RPN Calculator 69
- Example of disp Function 71
- Integration Design Rules 73
- A Step-by-Step Example 75
- Simulating the Entire Design 80
- Design Tools 90
- Generating an FPGA Bitstream 93
- Implementing Your Design 94
- Table 1-1: 97
- DSP48 Block 101
- Dynamic Control of the DSP48 101
- DSP48 Macro Block 102
- UG640 (v 12.2) July 23, 2010 103
- Design Styles for the DSP48 105
- DSP48 Design Techniques 106
- C-Input Sharing 107
- Adder Trees Planning 107
- Placement 107
- Signal Length Planning 107
- Cascade Routing Buses 107
- Design Overview 110
- Run the Simulation 115
- Multiple Clock Applications 118
- Clock Domain Partitioning 119
- Crossing Clock Domains 120
- Step-by-Step Example 122
- Creating a Top-Level Wrapper 126
- ChipScope Pro Overview 130
- Real-Time Debug 135
- Bus Plot 137
- Co-Simulation 140
- Benefits 141
- Pro Analyzer 141
- Hardware/Software Co-Design 143
- Black Box Block 144
- PicoBlaze Block 144
- EDK Processor Block 144
- Memory Map Creation 146
- Hardware Generation 147
- Hardware Co-Simulation 147
- The Software Driver 148
- API Documentation 150
- Writing a Software Program 151
- Single-Word Reads 152
- Single-Word Writes 152
- Asynchronous Support 154
- Dual Clock Wiring Scheme 156
- Single Clock Wiring Scheme 158
- Troubleshooting 161
- EDK Support 163
- EDK Import Wizard 164
- Limitations 164
- Exporting a pcore 166
- Architecture Highlights 167
- 16 General Purpose Registers 167
- Flags and Program Control 168
- Input/Output 168
- Interrupt 168
- Write Software 176
- Create an XPS Project 179
- Import the XPS Project 180
- Write Software Programs 181
- Create a Testbench Model 184
- Using XPS 186
- Using Platform Studio SDK 191
- Embedded DSP Design 200
- Objectives 201
- Tutorial Exercise Setup 201
- Design Description 202
- PROCEDURE 203
- Hardware Co-Simulation Block 207
- Using Hardware Co-Simulation 225
- Choosing a Compilation Target 227
- Invoking the Code Generator 227
- Hardware Co-Simulation Blocks 228
- 2. Select 231
- 1. Click 231
- Clocking Modes 232
- Selecting the Clock Mode 232
- Board-Specific I/O Ports 233
- Interface Features 235
- Co-Simulating the Design 238
- Known Issues 239
- Setup Procedures 239
- Specifying the Cable Location 240
- Starting Up a CSE server 241
- Shared Memory Support 242
- Compiling Shared Memory Pairs 244
- Memory Type Icon 245
- Shared Memory 245
- Shared FIFO 245
- Shared Register 245
- Co-Simulating Shared FIFOs 249
- Shared Memories 254
- Adding Buffers to a Design 256
- Using Vector Transfers 262
- Valid Bit Generation 270
- 5x5 Filter Kernel Test Bench 272
- Reloading the Kernel 276
- ®/Simulink software from The 277
- Setup the PC 281
- Setup the ML402 board 282
- Install Related Software 286
- Setup the Local Area Network 286
- Setup the ML506 board 287
- System ACE™ Reset 290
- Setup the ML605 board 291
- Simulation 294
- Setup the SP601/SP605 Board 299
- Setup the ML402 Board 301
- Setup the ML605 Board 303
- Hardware Requirements 307
- Supporting New Boards 307
- SBDBuilder Dialog Box 308
- Saving Plugin Files 312
- Board Support Package Files 313
- Providing Your Own Top Level 317
- Plugins Directory 318
- Detecting New Packages 319
- Importing HDL Modules 321
- Language Selection 325
- Defining Block Ports 326
- Port Object 326
- Port Types 327
- Configuring Port Sample Rates 328
- Dynamic Output Ports 328
- Black Box Clocking 329
- Combinational Paths 330
- Error Checking 331
- Black Box API 331
- SysgenBlockDescriptor Methods 332
- SysgenPortDescriptor Methods 334
- HDL Co-Simulation 335
- ModelSim Simulator 336
- Black Box Examples 338
- /coregen_import_example2.cgp 345
- Click Next > 347
- Importing a VHDL Module 352
- Importing a Verilog Module 359
- Dynamic Black Boxes 361
- Simultaneously 363
- ModelSim 366
- Encrypted VHDL File 370
- Chapter 5 377
- HDL Netlist Compilation 378
- NGC Netlist Compilation 378
- Bitstream Compilation 379
- XFLOW Option Files 380
- Additional Settings 381
- EDK Export Tool 383
- Export as Pcore to EDK 385
- See Also: 386
- Period and Slack 389
- Path Analysis Example 389
- Timing Analyzer Features 390
- Cross-Probing 391
- Histogram Charts 392
- Histogram Detail 394
- Statistics 394
- Trace Report 394
- Improving Failing Paths 395
- Generate the Example Design 398
- Examine the Slow Paths 398
- Rescue the Design 399
- Creating Compilation Targets 401
- The xltarget Function 402
- Target Info Functions 403
- Using XFLOW 405
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