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International Standard Iec 61691-4 Ieee 1364™ This is a preview - click here to buy the full publication INTERNATIONAL IEC STANDARD 61691-4 First edition 2004-10 IEEE 1364™ Behavioural languages – Part 4: Verilog® hardware description language 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, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: [email protected] Web: www.iec.ch The Institute of Electrical and Electronics Engineers, Inc, 3 Park Avenue, New York, NY 10016-5997, USA Telephone: +1 732 562 3800 Telefax: +1 732 562 1571 E-mail: [email protected] Web: www.standards.ieee.org Commission Electrotechnique Internationale International Electrotechnical Commission Международная Электротехническая Комиссия 2 IEC 61691-4:2004(E) This is a preview - click here to buy the full publication IEEE 1364-2001(E) CONTENTS FOREWORD .............................................................................................................................................. 19 IEEE Introduction........................................................................................................................................ 23 1.Overview............................................................................................................................................. 25 1.1Objectives of this standard.......................................................................................................... 25 1.2Conventions used in this standard............................................................................................... 25 1.3Syntactic description................................................................................................................... 26 1.4Contents of this standard............................................................................................................. 26 1.5Header file listings...................................................................................................................... 28 1.6Examples..................................................................................................................................... 29 1.7Prerequisites................................................................................................................................ 29 2.Lexical conventions............................................................................................................................30 2.1Lexical tokens.............................................................................................................................30 2.2White space.................................................................................................................................30 2.3Comments...................................................................................................................................30 2.4Operators.....................................................................................................................................30 2.5Numbers......................................................................................................................................30 2.5.1Integer constants.............................................................................................................31 2.5.2Real constants................................................................................................................ 34 2.5.3Conversion..................................................................................................................... 34 2.6Strings........................................................................................................................................34 2.6.1String variable declaration.............................................................................................35 2.6.2String manipulation........................................................................................................35 2.6.3Special characters in strings...........................................................................................35 2.7Identifiers, keywords, and system names..................................................................................36 2.7.1Escaped identifiers.........................................................................................................36 2.7.2Generated identifiers......................................................................................................37 2.7.3Keywords.......................................................................................................................37 2.7.4System tasks and functions............................................................................................37 2.7.5Compiler directives........................................................................................................38 2.8Attributes....................................................................................................................................38 2.8.1Examples........................................................................................................................39 2.8.2Syntax............................................................................................................................40 3.Data types...........................................................................................................................................44 3.1Value set.....................................................................................................................................44 3.2Nets and variables...................................................................................................................... 44 3.2.1Net declarations.............................................................................................................44 3.2.2Variable declarations.....................................................................................................46 3.3Vectors.......................................................................................................................................47 3.3.1Specifying vectors..........................................................................................................47 3.3.2Vector net accessibility..................................................................................................48 3.4Strengths....................................................................................................................................48 3.4.1Charge strength..............................................................................................................48 3.4.2Drive strength.................................................................................................................48 3.5Implicit declarations...................................................................................................................49 3.6Net initialization.........................................................................................................................49 3.7Net types....................................................................................................................................49 3.7.1Wire and tri nets.............................................................................................................49 3.7.2Wired nets......................................................................................................................50 Copyright Published ©by 2001IEC u nderIEEE. lice Allnce rights from IE reserved.EE. © 2004 IEEE. All rights reserved. vii IEC 61691-4:2004(E) 3 IEEE 1364-2001(E) This is a preview - click here to buy the full publication 3.7.3Trireg net........................................................................................................................50 3.7.4Tri0 and tri1 nets............................................................................................................54 3.7.5Supply nets.....................................................................................................................55 3.8regs.............................................................................................................................................55 3.9Integers, reals, times, and realtimes...........................................................................................55 3.9.1Operators and real numbers...........................................................................................56 3.9.2Conversion.....................................................................................................................56 3.10 Arrays........................................................................................................................................57 3.10.1Net arrays.......................................................................................................................57 3.10.2reg and variable arrays...................................................................................................57 3.10.3Memories.......................................................................................................................57
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