Xilinx Synthesis Technology User Guide

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XST User Guide Timing constraint: Default OFFSET OUT AFTER for Clock 'clk' Offset: 9.497ns (Levels of Logic = 2) Source: sixty_msbcount_qoutsig_1 Destination: tensout Source Clock: clk rising Data Path: sixty_msbcount_qoutsig_1 to tensout Gate Net Cell:in->out fanout Delay Delay Logical Name (Net Name) ------------------------------------------ ----------------------- FDCPE:c->q 12 1.085 2.16 sixty_msbcount_qoutsig_1 (sixty_msbcount_qoutsig_1) LUT4:i1->o 1 0.549 1.035 msbled_mrom_led_inst_lut4_161 (tensout_6_obuf) OBUF:i->o 4.668 tensout_6_obuf (tensout) ------------------------------------------ Total 9.497ns(6.302nslogic,3.195ns route) (66.4% logic, 33.6% route) ------------------------------------------------------------------ Timing constraint: Default path analysis Offset: 8.232ns (Levels of Logic = 2) Source: xcounter Destination: tenthsout Data Path: xcounter to tenthsout Gate Net Cell:in->out fanout Delay Delay Logical Name (Net Name) ------------------------------------------ ----------------------tenths:q 10 0.000 1.980 xcounter (q) LUT4:i0->o 1 0.549 1.035 tenthsout1 (tenthsout_4_obuf) OBUF:i->o 4.668 tenthsout_4_obuf (tenthsout) ------------------------------------------ Total 8.232ns(5.217ns logic,3.015ns route) (63.4% logic, 36.6% route) ================================================================== CPU : 2.75 / 5.33 s | Elapsed : 3.00 / 5.00 s --> Total memory usage is 35368 kilobytes 9-12 Xilinx Development System
CPLD Log File Log File Analysis The following is an example of an XST log file for CPLD synthesis. Release 5.1i - xst F.23 Copyright (c) 1995-2002 Xilinx, Inc. All rights reserved. TABLE OF CONTENTS 1) Synthesis Options Summary 2) HDL Compilation 3) HDL Analysis 4) HDL Synthesis 4.1) HDL Synthesis Report 5) Low Level Synthesis 6) Final Report ========================================================================= * Synthesis Options Summary * ========================================================================= ---- Source Parameters Input File Name : c:\users\new_log\new.prj Input Format : vhdl ---- Target Parameters Output File Name : c:\users\new_log\new.ngc Output Format : ngc Target Device : r3032xl-5-VQ44 ---- Source Options Automatic FSM Extraction : yes FSM Encoding Algorithm : Auto FSM Flip-Flop Type : D Mux Extraction : yes Priority Encoder Extraction : yes Decoder Extraction : yes Shift Register Extraction : yes Logical Shifter Extraction : yes XOR Collapsing : yes Resource Sharing : yes Complex Clock Enable Extraction : yes ---- Target Options Equivalent register Removal : no XST User Guide 9-13
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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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HDL Coding Techniques 4-bit Unsigne
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HDL Coding Techniques entity counte
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Verilog Code HDL Coding Techniques
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HDL Coding Techniques 4-bit Unsigne
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Accumulators HDL Coding Techniques
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HDL Coding Techniques • shift mod
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HDL Coding Techniques 8-bit Shift-L
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Dynamic Shift Register module shift
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library IEEE; use IEEE.std_logic_11
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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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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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Page 407 and 408: Command Line Mode Introduction Chap
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Page 427 and 428: XST Shell Command Line Mode To use
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Page 431 and 432: Log File Analysis Introduction This
Page 433 and 434: Quiet Mode Timing Report Log File A
Page 435 and 436: RAM Style : Auto ROM Extraction : y
Page 437 and 438: Synthesizing Unit . Related source
Page 439 and 440: # Counters : 2 # 4-bit up counter :
Page 441: Log File Analysis Data Path: sixty_
Page 445 and 446: Analyzing Entity (Architecture ).
Page 447 and 448: Log File Analysis =================
Page 449 and 450: XST Naming Conventions This appendi
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