Xilinx Synthesis Technology User Guide

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XST User Guide Verilog Following is the Verilog code. module mux (sel, res); input [2:0] sel; output [7:0] res; reg [7:0] res; always @(sel or res) begin case (sel) 3'b000 : res = 8'b00000001; 3'b001 : res = 8'b00000010; 3'b010 : res = 8'b00000100; 3'b011 : res = 8'b00001000; 3'b100 : res = 8'b00010000; 3'b101 : res = 8'b00100000; // 110 and 111 selector values are unused default : res = 8'bxxxxxxxx; endcase end endmodule 2-90 Xilinx Development System
Priority Encoders Log File HDL Coding Techniques XST is able to recognize a priority encoder, but in most cases XST will not infer it. To force priority encoder inference, use the priority_extract constraint with the value force. Xilinx strongly suggests that you use this constraint on the signal-by-signal basis; otherwise, the constraint may guide you towards sub-optimal results. The XST log file reports the type and size of recognized priority encoders during the macro recognition step. ... Synthesizing Unit . Related source file is priority_encoders_1.vhd. Found 3-bit 1-of-9 priority encoder for signal . Summary: inferred 3 Priority encoder(s). Unit synthesized. ============================== HDL Synthesis Report Macro Statistics # Priority Encoders : 1 3-bit 1-of-9 priority encoder : 1 ============================== ... 3-Bit 1-of-9 Priority Encoder Note For this example XST may infer a priority encoder. You must use the priority_extract constraint with a value force to force its inference. Related Constraint A related constraint is priority_extract. XST User Guide 2-91
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Xilinx Synthesis Technology (XST) U
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About This Manual Manual Contents T
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Resource Description/URL About This
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Conventions Typographical This manu
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Contents About This Manual Conventi
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Contents 8-bit Shift-Left Register
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Contents Dividers .................
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Contents Verilog Flow: ............
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Contents Sequential Process with a
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Introduction Architecture Support X
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Introduction 4. Set the desired Syn
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Figure 1-1 View Synthesis Report In
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HDL Coding Techniques This chapter
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HDL Coding Techniques The following
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Table 2-1 VHDL and Verilog Examples
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Signed/Unsigned Support Registers H
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Flip-flop with Positive-Edge Clock
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VHDL Code HDL Coding Techniques Fol
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IO Pins Description CE Clock Enable
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Log File HDL Coding Techniques The
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HDL Coding Techniques Verilog Code
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HDL Coding Techniques 4-bit Latch w
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Tristates Log File HDL Coding Techn
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Counters HDL Coding Techniques XST
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Page 63 and 64: HDL Coding Techniques 4-bit Unsigne
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Page 67 and 68: Verilog Code HDL Coding Techniques
Page 69 and 70: HDL Coding Techniques 4-bit Unsigne
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Page 73 and 74: Accumulators HDL Coding Techniques
Page 77 and 78: HDL Coding Techniques • shift mod
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Page 83 and 84: HDL Coding Techniques 8-bit Shift-L
Page 93 and 94: Dynamic Shift Register module shift
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Page 109 and 110: VHDL (One-Cold) Following is the VH
Page 111 and 112: VHDL Following is the VHDL code. li
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Page 117 and 118: Verilog Logical Shifters HDL Coding
Page 119 and 120: Example 1 HDL Coding Techniques The
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Page 125 and 126: Unsigned 8-bit Adder HDL Coding Tec
Page 127 and 128: HDL Coding Techniques Verilog Follo
Page 131 and 132: Simple Signed 8-bit Adder HDL Codin
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Page 135 and 136: Comparators (=, /=,=) HDL Coding Te
Page 137 and 138: HDL Coding Techniques this, XST can
Page 139 and 140: Dividers HDL Coding Techniques VHDL
Page 143 and 144: B C A OPER +/- RES OPER X8984 HDL C
Page 145 and 146: HDL Coding Techniques • RAM descr
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Page 149 and 150: HDL Coding Techniques VHDL The foll
Page 151 and 152: HDL Coding Techniques Verilog The f
Page 153 and 154: HDL Coding Techniques VHDL The foll
Page 155 and 156: Log File HDL Coding Techniques The
Page 157 and 158: VHDL Following is the VHDL code for
Page 159 and 160: HDL Coding Techniques Single-Port R
Page 161 and 162: Verilog HDL Coding Techniques Follo
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HDL Coding Techniques Single-Port R
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Verilog Following is the Verilog co
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VHDL HDL Coding Techniques Followin
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Dual-Port RAM with Asynchronous Rea
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HDL Coding Techniques Dual-Port RAM
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Verilog HDL Coding Techniques Follo
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HDL Coding Techniques architecture
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HDL Coding Techniques Dual-Port RAM
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VHDL Following is the VHDL code for
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Inputs Next State Function RESET CL
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FSM with 1 Process HDL Coding Techn
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Inputs FSM with 2 Processes HDL Cod
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process2 : process (state, x1) begi
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State Registers HDL Coding Techniqu
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Compact HDL Coding Techniques Compa
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Black Box Support Log File HDL Codi
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FPGA Optimization Introduction This
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Macro Generation • Number of Cloc
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Multiplexers FPGA Optimization For
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RAMs FPGA Optimization Two types of
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Flip-Flop Retiming FPGA Optimizatio
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FPGA Optimization INCREMENTAL_SYNTH
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FPGA Optimization Note In the curre
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FPGA Optimization generated NGC fil
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FPGA Optimization The problem most
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Log File Analysis FPGA Optimization
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FPGA Optimization • Tristates Thi
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FPGA Optimization NOTE: THESE TIMIN
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FPGA Optimization The start point a
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FPGA Optimization If the box_type a
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Instantiation of MUXF5 FPGA Optimiz
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Specifying INITs and RLOCs in HDL C
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FPGA Optimization for registers onl
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PCI Flow FPGA Optimization To succe
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CPLD Optimization This chapter cont
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Implementation Details for Macro Ge
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CPLD Optimization • Final results
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CPLD Optimization The CPLD fitter m
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Design Constraints Chapter 5 This c
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Synthesis Options Design Constraint
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Design Constraints Figure 5-4 Synth
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• Mux Extraction • Mux Style
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Design Constraints For FPGA device
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XST Constraint File (XCF) Design Co
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Design Constraints Timing Constrain
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Design Constraints • Add IO Buffe
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Design Constraints the components c
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HDL Constraints Design Constraints
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FPGA Constraints (non-timing) Desig
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Design Constraints • Number of Cl
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Design Constraints This constraint
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Timing Constraints Design Constrain
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Design Constraints See the “CLOCK
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Design Constraints The following ti
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Design Constraints • TIMEGRP TIME
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Design Constraints See the “INPAD
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Constraint Name clock_buffer bufgdl
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Constraint Name move_last- _stage m
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Constraint Name xor_collapse yes, n
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Constraint Name synthesis/ synopsis
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Design Constraints The following ta
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*Also Supported in XCF format. Impl
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Design Constraints The binary equiv
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Table 5-5 Third Party Constraints N
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Table 5-5 Third Party Constraints N
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Constraints Precedence Design Const
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VHDL Language Support Chapter 6 Thi
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VHDL Language Support 'W' means wea
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VHDL Language Support compiled in t
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Record Types Objects in VHDL MATRIX
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Entity Declaration VHDL Language Su
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VHDL Language Support Example 6-2 g
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VHDL Language Support Example 6-3 4
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egin Y 13), port map (X,Y,C1); C2
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VHDL Language Support Example 6-5 M
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VHDL Language Support Example 6-8 N
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Example 6-10 Combinatorial Process
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VHDL Language Support Example 6-12
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For...Loop Statement VHDL Language
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Sequential Process without a Sensit
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egin if RST = '1' then DO
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Multiple Wait Statements Descriptio
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Functions and Procedures VHDL Langu
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VHDL Language Support Example 6-24
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STANDARD Package VHDL Language Supp
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VHDL Language Support Note Function
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Packages Enumeration Types Integer
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Table 6-4 Objects VHDL Language Sup
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Wait Statement Loop Statement Table
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VHDL Reserved Words The following t
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Verilog Language Support Chapter 7
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Behavioral Verilog Features Verilog
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Verilog Language Support Example 7-
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Table 7-1 Expressions Bitwise Negat
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Modules Verilog Language Support In
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Procedural Assignments Verilog Lang
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Verilog Language Support Casez trea
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While Loops Verilog Language Suppor
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Verilog Language Support Example 7-
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Verilog Language Support The main l
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Verilog Language Support • You ca
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Example 7-9 Function Declaration an
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Blocking Versus Non-Blocking Proced
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Include Files Verilog Language Supp
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Verilog Language Support Each insta
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Parameters Verilog Language Support
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Verilog Language Support • Design
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Verilog Meta Comments Verilog Langu
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Table 7-4 Data Types Registers Vect
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Table 7-8 Design Hierarchy Module d
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Verilog Reserved Keywords Verilog L
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Command Line Mode Introduction Chap
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Command Line Mode • Script File
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Command Line Mode • Second column
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Table 8-4 HDL Options (VHDL and Ver
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Command Line Mode Table 8-6 Target
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Command Line Mode • To get a list
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Elaborate Command Time Command Comm
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♦ smallcntr.vhd Command Line Mode
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Command Line Mode You can improve t
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Command Line Mode Sometimes, XST is
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XST Shell Command Line Mode To use
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Case 2 Command Line Mode Each desig
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Log File Analysis Introduction This
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Quiet Mode Timing Report Log File A
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RAM Style : Auto ROM Extraction : y
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Synthesizing Unit . Related source
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# Counters : 2 # 4-bit up counter :
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Log File Analysis Data Path: sixty_
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CPLD Log File Log File Analysis The
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Analyzing Entity (Architecture ).
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Log File Analysis =================
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XST Naming Conventions This appendi
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