Xilinx V2.1 Manual de usuario descargar pdf (Pagina 56)

56 Xilinx Development System

Xilinx System Generator v2.1 Reference Guide

Figure 3-34: Forney convolutional interleaver with a constant difference

between consecutive branches

When the block is in deinterleaver mode, the input data sampled on the DIN port is

multiplexed into and out of B shift registers onto the DOUT port using two

(synchronized)commutator arms.Branch 0 will have a shift registerof length(B-1)*L.

Branch (B-1) shall have a shift register length of zero.

Figure 3-35: Forney convolutional deinterleaver with a constant difference

between consecutive branches

1 2 ... 51 52 53 54 55 56 57 58 59 60 61 ... 147 148

Xilinx System 1
Generator v2.1 1
About This Manual 2
Additional Resources 3
Conventions 4
Contents 5
Chapter 6 Auxiliary Files 7
Chapter 1 8
Introduction 8
Arithmetic Data Types 12
Hardware Handshaking 13
Chapter 2 15
Xilinx Blockset Overview 15
Valid and Invalid Data 17
Port Data Types 17
Licensed Cores 18
Versions 19
Arithmetic Type 20
Generate Core 20
Precision 21
Number of Bits 21
Overﬂow and Quantization 21
Override with Doubles 21
Sample Period 22
Chapter 3 23
Xilinx Blocks 23
Addressable Shift Register 26
Black Box 28
Block Interface 30
Constant 31
Down Sample 36
Get Valid Bit 37
Parallel to Serial 39
Register 40
Reinterpret 42
Serial to Parallel 43
Set Valid Bit 45
Up Sample 50
Communication 52
Depuncture 54
Interleaver Deinterleaver 55
Puncture 58
RS Decoder 59
RS Encoder 63
Viterbi Decoder 68
Xilinx LogiCore 70
Xk() xm()W 75
Block Timing 77
Accumulator 81
Inverter 85
Relational 90
SineCosine 93
Threshold 95
MATLAB I/O 96
Gateway In 97
Gateway Out 99
Quantization Error Blocks 101
Dual Port RAM 102
Block Parameters Dialog Box 104
Xilinx LogiCORE 105
Single Port RAM 110
State Machine 114
Moore State Machine 116
Chapter 4 127
Using Black Boxes 128
Black Box window 129
System Clock Period 133
Multicycle Path Constraints 133
Important Issues 136
138 Xilinx Development System 138
• sysgen.log - log ﬁle 138
System Generator 138
Chapter 5 139
Using the Xilinx Software 139
Implementing your design 140
Using an EDIF software ﬂow 143
Simulation 143
MXE libraries 144
Chapter 6 146
Auxiliary Files 146
Perl scripts 147
148 Xilinx Development System 148

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