Xilinx Synthesis Technology User Guide

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XST User Guide Log File The XST log file reports the type and size of recognized counters during the macro recognition step. ... Synthesizing Unit . Related source file is counters_1.vhd. Found 4-bit up counter for signal . Summary: inferred 1 Counter(s). Unit synthesized. ============================== HDL Synthesis Report Macro Statistics # Counters : 1 4-bit up counter : 1 ============================== ... Note During synthesis, XST decomposes Counters on Adders and Registers if they do not contain synchronous load signals. This is done to create additional opportunities for timing optimization. Because of this, counters reported during the recognition step and in the overall statistics of recognized macros may not appear in the final report. Adders/registers are reported instead. 4-bit Unsigned Up Counter with Asynchronous Clear The following table shows pin definitions for a 4-bit unsigned up counter with asynchronous clear. IO Pins Description C Positive-Edge Clock CLR Asynchronous Clear (active High) Q[3:0] Data Output 2-36 Xilinx Development System
VHDL Code HDL Coding Techniques Following is VHDL code for a 4-bit unsigned up counter with asynchronous clear. library ieee; use ieee.std_logic_1164.all; use ieee.std_logic_unsigned.all; entity counter is port(C, CLR : in std_logic; Q : out std_logic_vector(3 downto 0)); end counter; architecture archi of counter is signal tmp: std_logic_vector(3 downto 0); begin process (C, CLR) begin if (CLR='1') then tmp
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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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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 37 and 38: Signed/Unsigned Support Registers H
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: 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 83 and 84: HDL Coding Techniques 8-bit Shift-L
Page 93 and 94: Dynamic Shift Register module shift
Page 95 and 96: library IEEE; use IEEE.std_logic_11
Page 99 and 100: neither Full nor Parallel module no
Page 101 and 102: Related Constraints Related constra
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Page 107 and 108: Decoders Log File HDL Coding Techni
Page 109 and 110: 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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