Unit5ModerndigitaldesignLesson15VHDL《電子信息工程專業(yè)英語教程（第5版）》Lesson15VHDLBackgroundsTexttour

LanguageinuseVocabularyStructureReading/writingtechniques2024/5/292《電子信息工程專業(yè)英語教程（第5版）》Terminologytestbench 試驗工作臺，測試工作臺Impedance 阻抗typeconversion 類型變換top-downapproach自頂向下的方法gate-level 門電路級learningcurve 學(xué)習(xí)曲線Backgrounds2024/5/293《電子信息工程專業(yè)英語教程（第5版）》TexttourOutlineWhatisVHDL?AStandardLanguageABriefHistoryofVHDLWhenShouldYouUseVHDL?2024/5/294《電子信息工程專業(yè)英語教程（第5版）》WhatisVHDL?VHDLisaprogramminglanguagethathasbeendesignedandoptimizedfordescribingthebehaviorofdigitalsystems.VHDLhasmanyfeaturesappropriatefordescribingthebehaviorofelectroniccomponentsrangingfromsimplelogicgatestocompletemicroprocessorsandcustomchips.2024/5/295《電子信息工程專業(yè)英語教程（第5版）》WhatisVHDL?VHDLisalsoageneral-purposeprogramminglanguage:justashigh-levelprogramminglanguagesallowcomplexdesignconceptstobeexpressedascomputerprograms,VHDLallowsthebehaviorofcomplexelectroniccircuitstobecapturedintoadesignsystemforautomaticcircuitsynthesisorforsystemsimulation.

OneofthemostimportantapplicationsofVHDListocapturetheperformancespecificationforacircuit,intheformofwhatiscommonlyreferredtoasatestbench.2024/5/296《電子信息工程專業(yè)英語教程（第5版）》AStandardLanguageOneofthemostcompellingreasonsforyoutobecomeexperiencedwithandknowledgeableinVHDLisitsadoptionasastandardintheelectronicdesigncommunity.UsingastandardlanguagesuchasVHDLvirtuallyguaranteesthatyouwillnothavetothrowawayandrecapturedesignconceptssimplybecausethedesignentrymethodyouhavechosenisnotsupportedinanewergenerationofdesigntools.Usingastandardlanguagealsomeansthatyouaremorelikelytobeabletotakeadvantageofthemostup-to-datedesigntoolsandthatyouwillhaveaccesstoaknowledgebaseofthousandsofotherengineers,manyofwhomaresolvingproblemssimilartoyourown.2024/5/297《電子信息工程專業(yè)英語教程（第5版）》ABriefHistoryofVHDLintheearly1980sVHDLwasdevelopedasaspin-offofahigh-speedintegratedcircuitresearchprojectfundedbytheU.S.DepartmentofDefense.in1985ThefirstpubliclyavailableversionofVHDL,version7.2,wasreleased.2024/5/298《電子信息工程專業(yè)英語教程（第5版）》ABriefHistoryofVHDLin1987IEEE1076-1987in1994IEEE1076-1993in1995IEEE1076.3,IEEE1076.42024/5/299《電子信息工程專業(yè)英語教程（第5版）》WhenShouldYouUseVHDL?VHDLwillimproveyourproductivity.VHDL(likeastructuredsoftwaredesignlanguage)ismostbeneficialwhenyouuseastructured,top-downapproachtodesign. AnotherimportantreasontouseVHDListherapidpaceofdevelopmentinelectronicdesignautomation(EDA)toolsandintargettechnologies.2024/5/2910《電子信息工程專業(yè)英語教程（第5版）》VocabularyappropriatepackageannotationvarietystatementaddressStructureReading/writingtechniquesLanguageinuse2024/5/2911《電子信息工程專業(yè)英語教程（第5版）》Vocabulary2024/5/2912《電子信息工程專業(yè)英語教程（第5版）》AppropriateindictionarySuitableforaparticularperson,condition,occasion,orplace;fitting.

適合；適宜的Tosetapartforaspecificuse:

撥出appropriatingfundsforeducation.Totakepossessionoformakeuseofexclusivelyforoneself,oftenwithoutpermission:

挪用Leeappropriatedmyunreadnewspaperandneverreturnedit.2024/5/2913《電子信息工程專業(yè)英語教程（第5版）》Appropriateintext

VHDLhasmanyfeaturesappropriatefordescribingthebehaviorofelectroniccomponentsrangingfromsimplelogicgatestocompletemicroprocessorsandcustomchips.VHDL有多個適于描述電子元器件（范圍從簡單邏輯門到微處理器、定制芯片）行為的特點。

2024/5/2914《電子信息工程專業(yè)英語教程（第5版）》PackageindictionaryAwrappedorboxedobject;aparcel.

包裹Acontainerinwhichsomethingispackedforstorageortransportation.

包裝Apreassembledunit.

預(yù)裝件Acommodity,suchasfood,uniformlyprocessedandcontainerized.

商品Apropositionoranoffercomposedofseveralitems,eachofwhichmustbeaccepted.

建議2024/5/2915《電子信息工程專業(yè)英語教程（第5版）》Packageindictionary

Acommonprogramwrittenforamajorapplicationsothatauser'sspecificproblemsofdataororganizationwillnotmakethepackagelessuseful.

軟件包Inelectronics,anintegratedcircuitchipanditshousing.

封裝2024/5/2916《電子信息工程專業(yè)英語教程（第5版）》PackageintextThisstandard,numbered1164,definesastandardpackage(aVHDLfeaturethatallowscommonlyuseddeclarationstobecollectedintoanexternallibrary)containingdefinitionsforastandardnine-valueddatatype.該標(biāo)準(zhǔn)（標(biāo)準(zhǔn)號為1164）定義了一個包含標(biāo)準(zhǔn)9值數(shù)據(jù)類型定義在內(nèi)的標(biāo)準(zhǔn)包（標(biāo)準(zhǔn)包是VHDL的特點之一，它允許將共用數(shù)據(jù)類型聲明集中于外部庫函數(shù)）。

2024/5/2917《電子信息工程專業(yè)英語教程（第5版）》Packageinuse

applicationpackage應(yīng)用程序件cardboardpackage硬紙板包裝controlpackage成套控制設(shè)備debuggingpackage調(diào)試程序包electricalpowerpackage電源組evacuatedpackage真空封裝graphicpackage圖形程序包interimreformpackage一攬子臨時改革辦法singlein-linepackage單行排齊(SIP)封裝2024/5/2918《電子信息工程專業(yè)英語教程（第5版）》AnnotationindictionaryTheactorprocessoffurnishingcriticalcommentaryorexplanatorynotes.

注解，注釋Acriticalorexplanatorynote;acommentary.

注文，釋文2024/5/2919《電子信息工程專業(yè)英語教程（第5版）》AnnotationintextTheannotation

oftiminginformationtoasimulationmodelisanimportantaspectofaccuratedigitalsimulation.TheVHDL1076standarddescribesavarietyoflanguagefeaturesthatcanbeusedfortimingannotation.精確數(shù)字仿真的一個重要方面是對仿真模型進(jìn)行時序信息的標(biāo)注。VHDL1076標(biāo)準(zhǔn)描述了一組可用于時序標(biāo)注的語言特點。

2024/5/2920《電子信息工程專業(yè)英語教程（第5版）》VarietyindictionaryThequalityorconditionofbeingvariousorvaried;diversity.

多樣化Anumberorcollectionofvariedthings,especiallyofaparticulargroup;anassortment:

一套物品broughthomeavarietyofsnacks.Agroupthatisdistinguishedfromothergroupsbyaspecificcharacteristicorsetofcharacteristics.

種類Avarietyshow.

雜耍表演2024/5/2921《電子信息工程專業(yè)英語教程（第5版）》VarietyintextTheVHDL1076standarddescribesavariety

oflanguagefeaturesthatcanbeusedfortimingannotation.However,itdoesnotdescribeastandardmethodforexpressingtimingdataoutsideofthetimingmodelitself.VHDL1076標(biāo)準(zhǔn)描述了一組可用于時序標(biāo)注的語言特點。然而，它并未描述出一種在時序模型外表達(dá)時序數(shù)據(jù)的標(biāo)準(zhǔn)方法。2024/5/2922《電子信息工程專業(yè)英語教程（第5版）》Varietyinuse

VariableVariant2024/5/2923《電子信息工程專業(yè)英語教程（第5版）》StatementindictionaryTheactofstatingordeclaring.

陳述Somethingstated;adeclaration.

宣言Aformalpleading.

指控2024/5/2924《電子信息工程專業(yè)英語教程（第5版）》StatementindictionaryAnabstractofacommercialorfinancialaccountshowinganamountdue;abill.

借貸表；結(jié)算表Amonthlyreportsenttoadebtororbankdepositor.

報告書Anelementaryinstructioninasourcelanguage.

指令2024/5/2925《電子信息工程專業(yè)英語教程（第5版）》StatementintextAsyoudiscoverthebenefitsofreusablecode,youwillsoonfindyourselfthinkingofwaystowriteyourVHDLstatementsinwaysthatmakethemgeneralpurpose[4].Writingportablecodewillbecomeanautomaticreflex.當(dāng)發(fā)現(xiàn)了可重用代碼的好處之后，你很快會發(fā)覺自己正在考慮采用VHDL，從而使自己編寫的語句更通用。編寫可移植代碼將會成為自覺的行為。2024/5/2926《電子信息工程專業(yè)英語教程（第5版）》Statementinuse

makeastatement:tocreateacertainimpression:

創(chuàng)造某種效果Glass,exposedbeams,andantiquesallcombinetomakeastrongdecorativestatement.將玻璃、裸露的柱子和古董結(jié)合在一起制造出強烈的裝飾效果2024/5/2927《電子信息工程專業(yè)英語教程（第5版）》Statementinuse

accountingstatement會計報表arithmeticassignmentstatement算術(shù)賦值語句arraydeclarationstatement數(shù)組說明語句balancestatement余額明細(xì)表callstatement調(diào)用語句2024/5/2928《電子信息工程專業(yè)英語教程（第5版）》AddressindictionaryTospeakto與…說話addressedmeinlowtones.Tomakeaformalspeechto講演Tomarkwithadestination寫地址addressaletter.Todirecttheeffortsorattentionof(oneself)忙于，專注于addressoneselftoatask.Todealwith處理addressedtheissueofabsenteeism.Todispatchorconsign(aship,forexample)toanagentorfactor.寄送，托運2024/5/2929《電子信息工程專業(yè)英語教程（第5版）》AddressindictionaryAformalspokenorwrittencommunication:

稱呼Aformalspeech.

演說Thewrittenorprinteddirectionsonmailorotherdeliverableitemsindicatingdestination.

地址Thelocationatwhichaparticularorganizationorpersonmaybefoundorreached.

住址2024/5/2930《電子信息工程專業(yè)英語教程（第5版）》AddressindictionaryCourteousattentions.

殷勤Themannerorbearingofaperson,especiallyinconversation.

舉止，談吐Skill,d