BS EN BRITISHSTANDARD 61691-1 : 1997 IEC 61691-1 : 1997 Design automation Part 1. VHDL language reference manual The European Standard EN 61691-1 : 1997has the status of a British Standard. ICS 35.060 BSi NOCOPYINGWITHOUTBSIPERMISSIONEXCEPTASPERMITTEDBYCOPYRIGHTLAW British Standards BSEN61691-1:1997 National foreword This British Standard is the English language version of EN 61691-1 : 1997. It is identical with IEC 61691-1 : 1997. The UK participation in its preparation was entrusted to Technical Committee GEL/93, Design automation, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committeeany enquiries informed; monitor related international and European developments and promulgate them in the UK. A listof organizations represented on this committeecanbeobtained on requestto its secretary. From 1 January1997, all IEC publications have the number 60000 added to the old number. For instance, IEC 27-1 has been renumbered as IEC 60027-1. For a period of time during the change over from one numbering system to the other, publications may contain identifiers from both systems. Cross-references Attention is drawn to the fact that CEN and CENELEC Standards normally include an annex which lists normative references to international publications with their corresponding European publications. The British Standards which implement these international or European publications maybe found in the BSI Standards Catalogueunder thesection entitledInternational Standards Correspondence Index', or by using the Find' facility of the BSI Standards Electronic Catalogue. Compliance with a British Standard does not of itself confer immunity fromlegal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, the EN foreword page, the IEC title page,pages 2 to 252, an inside back cover and a backcover Ad This British Standard, having Amendments issued sincepublication been prepared under the direction of the Electrotechnical Amd. No. Date Text affected Sector Board, was published under the authority of the S Standards Board and comes into effect on 15 December 1997 @BSI 1997 ISBN0580285901 EN61691-1 EUROPEAN STANDARD NORME EUROPEENNE EUROPAISCHE NORM September1997 ICS 35.060 , Version correct as of 20/10/2017 English version Design automation Part 1:VHDLlanguage referencemanual (IEC61691-1:1997) Automatisationdelaconception Entwurfsautomatisierungbeider Partie 1:Manuelde référencedu Entwicklung langageVHDL Teil 1: Handbuch zur (CEI61691-1:1997) Hardwarebeschreibungssprache VHDL (IEC61691-1:1997) This European Standard was approved by CENELEC on 1996-10-01.CENELEC members are bound to European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. CENELECmembersarethenationalelectrotechnicalcommitteesofAustria,Belgium,Denmark,Finland France,Germany,Greece, Iceland, Ireland, Italy,Luxembourg,Netherlands,Norway,Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC EuropeanCommitteeforElectrotechnical Standardization Comite Européende Normalisation Electrotechnique EuropaischesKomiteefurElektrotechnischeNormung CentralSecretariat:ruedeStassart35,B.-1050Brussels Ref.No.EN 61691-1:1997E EN61691-1:1997 Foreword The text of document 93/42/FDIS, future edition 1 of IEC 61691-1, prepared by IEC TC 93, Design automation, was submitted to the IEC-CENELEC parallel vote and was approved by CENELECasEN61691-1on1996-10-01. The following dates were fixed: -latestdatebywhichtheENhastobeimplemented at national level by publication of an identical national standard orby endorsement (dop)1998-04-01 - latest date by which the national standards conflicting withthe ENhavetobewithdrawn (dow)1998-04-01 Endorsementnotice Thetextof theInternational StandardIEC61691-1: