Xilinx Synthesis Technology User Guide

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XST User Guide tig See the Constraints Guide for details. from ... to ... See the Constraints Guide for details. Table 5-3 XST Timing Constraints Supported Only in XCF Name Value Target Technology See the Constraints Guide for details. See the Constraints Guide for details. Spartan-II/IIE, Virtex / II/II Pro/E Spartan-II/IIE, Virtex / II/II Pro/E The following table shows the timing constraints supported by XST that you can invoke only through the old XST constraint interface. Table 5-4 XST Timing Constraints Only Supported by Old XST Syntax Name Value Target Technology allclocknets real [ns|MHz] top entity/ module period real [ns|MHz] primary clock signal offset_in_before real [ns|MHz] top entity/ module, primary clock signal offset_out_after real [ns|MHz] top entity/ module, primary clock signal inpad_to_outpad real [ns|MHz] top entity/ module max_delay real [ns|MHz] top entity/ module Spartan-II/IIE, Virtex / II/II Pro/E Spartan-II/IIE, Virtex / II/II Pro/E Spartan-II/IIE, Virtex / II/II Pro/E Spartan-II/IIE, Virtex / II/II Pro/E Spartan-II/IIE, Virtex / II/II Pro/E Spartan-II/IIE, Virtex / II/II Pro/E 5-46 Xilinx Development System
*Also Supported in XCF format. Implementation Constraints Design Constraints Table 5-4 XST Timing Constraints Only Supported by Old XST Syntax Name Value Target Technology duty_cycle real [%|ns] primary clock signal This section explains how XST handles implementation constraints. See the Constraints Guide for details on the implementation constraints supported by XST. Handling by XST Spartan-II/IIE, Virtex / II/II Pro/E tig* yes, no signal Spartan-II/IIE, Virtex / II/II Pro/E Implementation constraints control placement and routing. They are not directly useful to XST, and are simply propagated and made available to the implementation tools. When the -write_timing_constraints switch is set to yes, the constraints are written in the output NGC file (Note: TIG is propagated regardless of the setting). In addition, the object that an implementation constraint is attached to will be preserved. A binary equivalent of the implementation constraints is written to the NGC file, but since it is a binary file, you cannot edit the implementation constraints there. Alternatively, you can code implementation constraints in the XCF file according to one of the following syntaxes. To apply a constraint to an entire entity, use one of the following two XCF syntaxes (please refer to the "Old Constraint Syntax" section for more information on the old syntax): MODEL EntityName PropertyName; MODEL EntityName PropertyName=PropertyValue; XST User Guide 5-47
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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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Page 257 and 258: CPLD Optimization • Final results
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Page 261 and 262: Design Constraints Chapter 5 This c
Page 263 and 264: Synthesis Options Design Constraint
Page 265 and 266: Design Constraints Figure 5-4 Synth
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Page 273 and 274: Design Constraints Timing Constrain
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Page 279 and 280: HDL Constraints Design Constraints
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Page 323 and 324: Record Types Objects in VHDL MATRIX
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Page 341 and 342: For...Loop Statement VHDL Language
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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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