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1、IEEEStd1076-1993(RevisionofIEEEStd1076-1987)IEEEStandardVHDLLanguageReferenceManualSponsorsDesignAutomationStandardsCommitteeoftheIEEEComputerSocietyandAutomaticTestProgramGenerationSubcommitteeofIEEEStandardsCoordinatingCommittee20ApprovedSeptember15,1993IEEE
2、StandardsBoardAbstract:ThisstandarddefinestheVHSICHardwareDescriptionLanguage(VHDL).VHDLisaformalnotationintendedforuseinallphasesofthecreationofelectronicsystems.Becauseitisbothmachinereadableandhumanreadable,itsupportsthedevelopment,verification,synthesis,an
3、dtestingofhardwaredesigns;thecommunicationofhardwaredesigndata;andthemainte-nance,modification,andprocurementofhardware.Itsprimaryaudiencesaretheimplementorsoftoolssupportingthelanguageandtheadvancedusersofthelanguage.Keywords:computer,computerlanguages,electr
4、onicsystems,hardware,hardwaredesign,VHDLTheInstituteofElectricalandElectronicsEngineers,Inc.345East47thStreet,NewYork,NY10017-2394,USACopyright'1994bytheInstituteofElectricalandElectronicsEngineers,Inc.Allrightsreserved.Published1994.PrintedintheUnitedStatesof
5、America.ISBN1-55937-376-8Nopartofthispublicationmaybereproducedinanyform,inanelectronicretrievalsystemorotherwise,withoutthepriorwrittenpermissionofthepublisher.IEEEStandardsdocumentsaredevelopedwithintheTechnicalCommitteesoftheIEEESocietiesandtheStandardsCoor
6、dinatingCommitteesoftheIEEEStandardsBoard.Membersofthecommitteesservevoluntarilyandwithoutcompensation.TheyarenotnecessarilymembersoftheInstitute.ThestandardsdevelopedwithinIEEErepresentaconsensusofthebroadexpertiseonthesubjectwithintheInstituteaswellasthoseac
7、tivitiesoutsideofIEEEthathaveexpressedaninterestinpartici-patinginthedevelopmentofthestandard.UseofanIEEEStandardiswhollyvoluntary.TheexistenceofanIEEEStandarddoesnotimplythattherearenootherwaystoproduce,test,measure,purchase,mar-ket,orprovideothergoodsandserv
8、icesrelatedtothescopeoftheIEEEStandard.Furthermore,theviewpointexpressedatthetimeastandardisapprovedandissuedissubjecttochangebroughtaboutthroughdevelopmentsinthestateoftheartandco
