1、 INTERNATIONAL STANDARD IEC61691-4 First edition2004-10 IEEE 1364Behavioural languages Part 4:Verilog hardware description language Reference number IEC 61691-4(E):2004 IEEE Std.1364(E):2001 LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUR
2、EAU.Publication numbering As from 1 January 1997 all IEC publications are issued with a designation in the 60000 series.For example,IEC 34-1 is now referred to as IEC 60034-1.Consolidated editions The IEC is now publishing consolidated versions of its publications.For example,edition numbers 1.0,1.1
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8、919 03 00 LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.Behavioural languages Part 4:Verilog hardware description language INTERNATIONAL STANDARD IEC61691-4 First edition2004-10 IEEE 1364Commission Electrotechnique InternationaleInte
9、rnational Electrotechnical Commission Copyright IEEE 2004 All rights reserved IEEE is a registered trademark in the U.S.Patent&Trademark Office,owned by the Institute of Electrical and Electronics Engineers,Inc.No part of this publication may be reproduced or utilized in any form or by any means,ele
10、ctronic or mechanical,including photocopying and microfilm,without permission in writing from the publisher.International Electrotechnical Commission,3,rue de Varemb,PO Box 131,CH-1211 Geneva 20,SwitzerlandTelephone:+41 22 919 02 11 Telefax:+41 22 919 03 00 E-mail:inmailiec.ch Web:www.iec.ch The Ins
11、titute of Electrical and Electronics Engineers,Inc,3 Park Avenue,New York,NY 10016-5997,USATelephone:+1 732 562 3800 Telefax:+1 732 562 1571 E-mail:stds-infoieee.org Web:www.standards.ieee.org LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY B
12、UREAU.Copyright 2001 IEEE.All rights reserved.vii 1.Overview.251.1 Objectives of this standard.251.2 Conventions used in this standard.251.3 Syntactic description.261.4 Contents of this standard.261.5 Header file listings.281.6 Examples.291.7 Prerequisites.292.Lexical conventions.302.1 Lexical token
13、s.302.2 White space.302.3 Comments.302.4 Operators.302.5 Numbers.302.5.1Integer constants.312.5.2Real constants.342.5.3Conversion.342.6 Strings.342.6.1String variable declaration.352.6.2String manipulation.352.6.3Special characters in strings.352.7 Identifiers,keywords,and system names.362.7.1Escape
14、d identifiers.362.7.2Generated identifiers.372.7.3Keywords.372.7.4System tasks and functions.372.7.5Compiler directives.382.8 Attributes.382.8.1Examples.392.8.2Syntax.403.Data types.443.1 Value set.443.2 Nets and variables.443.2.1Net declarations.443.2.2Variable declarations.463.3 Vectors.473.3.1Spe
15、cifying vectors.473.3.2Vector net accessibility.483.4 Strengths.483.4.1Charge strength.483.4.2Drive strength.483.5 Implicit declarations.493.6 Net initialization.493.7 Net types.493.7.1Wire and tri nets.493.7.2Wired nets.502 Published by IEC under licence from IEEE.2004 IEEE.All rights reserved.IEC
16、61691-4:2004(E)IEEE 1364-2001(E)CONTENTSIEEE Introduction.23 FOREWORD.19 LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.viii Copyright 2001 IEEE.All rights reserved.3.7.3Trireg net.503.7.4Tri0 and tri1 nets.543.7.5Supply nets.553.8 regs.553.9 Integers,reals,times,and realtimes.553.9.1Operators and real numbers.563.9.2Conversion.563.10 Arrays.573.10.1 Net arrays.573.10.2 reg and variable arrays.573.10.3 Memories.573.11 Parameters.5
