Xilinx Synthesis Technology User Guide

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XST User Guide Table 2-1 VHDL and Verilog Examples and Templates Macro Blocks Chapter Examples Language Templates RAMs Single-Port RAM with Asynchronous Read Single-Port RAM with "false" Synchronous Read Single-Port RAM with Synchronous Read (Read Through) Dual-Port RAM with Asynchronous Read Dual-Port RAM with False Synchronous Read Dual-Port RAM with Synchronous Read (Read Through) Dual-Port Block RAM with Different Clocks Multiple-Port RAM Descriptions State Machines FSM with 1 Process FSM with 2 Processes FSM with 3 Processes Black Boxes VHDL Verilog Single-Port Block RAM Single-Port Distributed RAM Dual-Port Block RAM Dual-Port Distributed RAM Binary State Machine One-Hot State Machine None 2-12 Xilinx Development System
Signed/Unsigned Support Registers HDL Coding Techniques When using Verilog or VHDL in XST, some macros, such as adders or counters, can be implemented for signed and unsigned values. For Verilog, to enable support for signed and unsigned values, you have to enable Verilog2001. You can enable it by selecting the Verilog 2001option under the Synthesis Options tab in the Process Properties dialog box within the Project Navigator, or by setting the -verilog2001 command line option to yes. See the “VERILOG2001” section in the Constraints Guide for details. For VHDL, depending on the operation and type of the operands, you have to include additional packages in your code. For example, in order to create an unsigned adder, you can use the following arithmetic packages and types that operate on unsigned values: PACKAGE TYPE numeric_std unsigned std_logic_arith unsigned std_logic_unsigned std_logic_vector In order to create a signed adder you can use arithmetic packages and types that operate on signed values. PACKAGE TYPE numeric_std signed std_logic_arith signed std_logic_signed std_logic_vector Please refer to the IEEE VHDL Manual for details on available types. XST recognizes flip-flops with the following control signals: • Asynchronous Set/Clear • Synchronous Set/Clear • Clock Enable XST User Guide 2-13
Page 1 and 2: Xilinx Synthesis Technology (XST) U
Page 3 and 4: About This Manual Manual Contents T
Page 5 and 6: Resource Description/URL About This
Page 7 and 8: Conventions Typographical This manu
Page 9 and 10: Contents About This Manual Conventi
Page 11 and 12: Contents 8-bit Shift-Left Register
Page 13 and 14: Contents Dividers .................
Page 15 and 16: Contents Verilog Flow: ............
Page 17 and 18: Contents Sequential Process with a
Page 19 and 20: Introduction Architecture Support X
Page 21 and 22: Introduction 4. Set the desired Syn
Page 23 and 24: Figure 1-1 View Synthesis Report In
Page 25 and 26: HDL Coding Techniques This chapter
Page 27 and 28: HDL Coding Techniques The following
Page 31 and 32: Table 2-1 VHDL and Verilog Examples
Page 33 and 34: Table 2-1 VHDL and Verilog Examples
Page 35: Table 2-1 VHDL and Verilog Examples
Page 39 and 40: Flip-flop with Positive-Edge Clock
Page 43 and 44: VHDL Code HDL Coding Techniques Fol
Page 47 and 48: IO Pins Description CE Clock Enable
Page 49 and 50: Log File HDL Coding Techniques The
Page 51 and 52: HDL Coding Techniques Verilog Code
Page 53 and 54: HDL Coding Techniques 4-bit Latch w
Page 55 and 56: Tristates Log File HDL Coding Techn
Page 59 and 60: Counters HDL Coding Techniques XST
Page 63 and 64: HDL Coding Techniques 4-bit Unsigne
Page 65 and 66: HDL Coding Techniques entity counte
Page 67 and 68: Verilog Code HDL Coding Techniques
Page 69 and 70: HDL Coding Techniques 4-bit Unsigne
Page 73 and 74: Accumulators HDL Coding Techniques
Page 77 and 78: HDL Coding Techniques • shift mod
Page 79 and 80: Log File HDL Coding Techniques The
Page 81 and 82: Verilog Code HDL Coding Techniques
Page 83 and 84: HDL Coding Techniques 8-bit Shift-L
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VHDL Code HDL Coding Techniques Fol
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Verilog Code HDL Coding Techniques
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Dynamic Shift Register module shift
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library IEEE; use IEEE.std_logic_11
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HDL Coding Techniques The following
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neither Full nor Parallel module no
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Related Constraints Related constra
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HDL Coding Techniques entity mux is
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Decoders Log File HDL Coding Techni
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VHDL (One-Cold) Following is the VH
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VHDL Following is the VHDL code. li
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Priority Encoders Log File HDL Codi
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Verilog Logical Shifters HDL Coding
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Example 1 HDL Coding Techniques The
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Verilog Arithmetic Operations Follo
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Unsigned 8-bit Adder HDL Coding Tec
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HDL Coding Techniques Verilog Follo
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Simple Signed 8-bit Adder HDL Codin
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Unsigned 8-bit Adder/Subtractor HDL
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Comparators (=, /=,=) HDL Coding Te
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HDL Coding Techniques this, XST can
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Dividers HDL Coding Techniques VHDL
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B C A OPER +/- RES OPER X8984 HDL C
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HDL Coding Techniques • RAM descr
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HDL Coding Techniques entity raminf
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HDL Coding Techniques VHDL The foll
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HDL Coding Techniques Verilog The f
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HDL Coding Techniques VHDL The foll
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Log File HDL Coding Techniques The
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VHDL Following is the VHDL code for
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HDL Coding Techniques Single-Port R
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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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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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