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1、TheVHDLGoldenReferenceGuideDOULOSVersion1.1,December1995©Copyright1995,Doulos,AllRightsReserved.Nopartofthispublicationmaybereproduced,storedinaretrievalsystem,ortransmitted,inanyformorbyanymeans,electronic,mechanical,photocopying,recordingorotherwise,withoutthepriorwrittenpermissionofDOUL
2、OS.PrintedintheUnitedKingdomofGreatBritainandNorthernIreland.DOULOSChurchHatch,22MarketPlace,Ringwood.Hampshire.BH241AWEngland.Tel(+44)(0)1425471223Fax(+44)(0)1425471573Emailinfo@doulos.co.ukPrefaceTheVHDLGoldenReferenceGuideisacompactquickreferenceguidetotheVHDLlanguage,itssyntax,semantic
3、s,synthesisandapplicationtohardwaredesign.TheVHDLGoldenReferenceGuideisnotintendedasareplacementfortheIEEEStandardVHDLLanguageReferenceManual.Unlikethatdocument,theGoldenReferenceguidedoesnotofferacomplete,formaldescriptionofVHDL.Rather,itoffersanswerstothequestionsmostoftenaskedduringthep
4、racticalapplicationofVHDL,inaconvenientreferenceformat.NorisTheVHDLGoldenReferenceGuideintendedtobeanintroductorytutorial.Informationispresentedhereinatersereferenceformat,notintheprogressiveandsympatheticmannernecessarytolearnasubjectascomplexasVHDL.However,acknowledgingthatthosealreadyfa
5、miliarwithcomputerlanguagesmaywishtousethisguideasaVHDLtextbook,abriefinformalintroductiontothesubjectisgivenatthestart.ThemainfeatureofTheVHDLGoldenReferenceGuideisthatitembodiesmuchpracticalwisdomgatheredovermanyVHDLprojects.Itdoesnotonlyprovideahandysyntaxreference;therearemanysimilarbo
6、okswhichperformthattaskadequately.Italsowarnsyouofthemostcommonlanguageerrors,givesclueswheretolookwhenyourcodewillnotcompile,alertsyoutosynthesisissues,andgivesadviceonimprovingyourcodingstyle.TheVHDLGoldenReferenceGuidewasdevelopedtoaddvaluetotheDoulosrangeofVHDLtrainingcourses,andalsoto
7、complementVHDLPaceMaker,theVHDLComputerBasedTrainingpackagefromDoulos.3UsingThisGuideThemainbodyofthisguideisorganisedalphabetically.Eachsectionisindexedbyakeytermwhichappearsprominentlyatthetopofeachpage.Oftenyoucanfindtheinformationyouwantbyflickingthroughth