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84 www.xilinx.com System Generator for DSP Getting Started Guide

UG639 (v 12.2) July 23, 2010

Chapter 4: Getting Started

Shared Memory Block

System Generator provides a simple abstraction for easily adding custom logic into a processor. The basic idea is to

allow memories in custom logic to be easily mapped into the processor's memory address space. System Generator

enables this through the use of Shared-Memory blocks provided in the System Generator block set.

1 2 ... 79 80 81 82 83 84 85 86 87 88 89 ... 98 99

Generator for 1
Table of Contents 3
Chapter 4: Getting Started 4
About This Guide 7
Additional Resources 8
Conventions 8
Online Document 9
Preface: About This Guide 10
Introduction 11
The Xilinx DSP Block Set 12
FIR Filter Generation 13
Support for MATLAB 14
System Resource Estimation 15
Hardware Co-Simulation 16
System Integration Platform 17
Chapter 1: Introduction 18
Installation 19
Chapter 2: Installation 20
Table 2-3: 20
Table 2-4: 20
UNC Paths Not Supported 21
Software Prerequisites 21
Post Installation Tasks 22
UG639 (v 12.2) July 23, 2010 23
ModelSim SE 24
Setting the Size 25
Setting the Number of Entries 25
Release Information 27
Hardware Recommendations 28
Known Issues 29
Release Notes 12.1 30
Xilinx Blockset Enhancements 31
Release Notes 11.4 35
Table 3-5: 37
Table 3-6: 37
Release Notes 11.3 39
Existing Block Updates 40
Table 3-7: 41
Table 3-8: 41
Getting Started 43
® Simulator 44
The Xilinx DSP Blockset 45
Defining the FPGA Boundary 46
Creating the DSP Design 48
Generating the HDL Code 49
Chapter 4: Getting Started 50
DSP blockset 50
Lesson 1 Summary 52
Lab Exercise: Using Simulink 52
Fixed-Point Numeric Precision 53
Overflow and Round Modes 55
Bit-Level Operations 56
The Reinterpret Block 57
The Convert Block 58
The Concat Block 59
Slice Block 60
The BitBasher Block 61
Lesson 2 Summary 62
Lab Exercise: Signal Routing 62
Lesson 3 - System Control 63
The MCode Block 64
State Machine Example 66
The Expression Block 67
Reset and Enable Ports 68
Bursty Data 69
Lesson 3 Summary 70
Lab Exercise: System Control 70
Lesson 4 - Multi-Rate Systems 71
Up and Down Sampling Blocks 72
Debugging Tools 75
Sample Period “Rules” 76
Lesson 5 - Using Memories 78
Initializing RAMs and ROMs 79
System Generator RAM Blocks 80
System Generator ROM Blocks 81
The Delay Block 82
The FIFO Block 83
Shared Memory Block 84
Lab Exercise: Using Memories 85
Lesson 6 - Designing Filters 86
The Virtex DSP48 Math Slice 87
FIR Compiler Block 88
Using FDA Tool Coefficients 90
Virtex®-5 architecture 91
Black Box Examples 92
ChipScope Examples 92
DSP Examples 93
M-Code Examples 94
Processor Examples 94
Shared Memory Examples 95
Timing Analysis Examples 96
Miscellaneous Examples 96
System Generator Demos 97

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