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1、The application of the development of the EDA and VHDL90s in 20 centuries,internationallast electronicsand calculatortechniquemore the forerunnersnation,hasbeenbeing activelyinvestigatinga newdesignmethodof theelectronicselectriccircuit, andcarriedonan exhaustivechangein theaspectsof designinga meth
2、od,tool wait, obtainhugesuccess.Atthe design realm of the electronicstechnique,the application of programmablelogic sparepart(likeCPLD, FPGA), havealreadygot extensiveuniversality,thesesparepartsbroughttremendousvivid forthe designof numerical system.These spareparts can passa software plait a dista
3、ncebut as to itshardwarestructureandwork thewaycarryonheavyGouandmakethusthedesignof hardwarecanlikesoftwaredesignso convenientfast.Theall thesebiggestchangeda traditional numericalmethod,designprocessof thesystemdesignanddesignideaandpromotedtheEDA technicalquickdevelopment.The EDA is an electronic
4、s design automation(theAutomation of the Electronic Design) ofabbreviation,design(CAD) from the calculator assistanceat the beginning of 90s in 20 centuries,calculatorassistance manufacturing(CAM),calculatorassistance test(CAT)andcalculatorlend supporttothe conceptof engineering(CAE)a developmentsin
5、cethen.TheEDA techniqueis to takecalculatorastool,designatEDA softwareterraceup,usethehardwaredescriptionlanguageHDL completionadesigna document,then is of oneself completedlogic to edit and translate,turn Chien, partitionedby thecalculator,comprehensive, excellentturn,setup, cloth line with imitate
6、 really, until for particulartargetchip of proper go togetherwith to edit and translate,the logic reflect to shoot with plait distancedownloadetc. work.The EDA technicalemergence,biggestraisedefficiency and maneuverabilityofelectriccircuit design,eased todesignof laborstrength.Thesesparepartscanpass
7、a softwareplait adistancebut asto itshardwarestructureandwork theway carry on heavyGou andmakethusthe designof hardwarecanlike softwaredesignsoconvenientfast.Theall thesebiggestchangeda traditionalnumericalmethod,designprocessof the systemdesignand design idea and promoted the EDA technical quick de
8、velopment.Makeuse of EDA tool, theelectronicsdesignercanstartdesignelectronicssystemfrom theconcept,calculateway,agreement.etc.,a greatdealof work canpasscalculatorcompletion,andcan designthe electronicsproductis from theelectriccircuit, the function analyzecomputeof the whole processof designan IC
9、landscapeor PCBlandscape onboardautoprocessing completion.Use to the EDA conceptor categoryvery breadthnow.Include in eachrealm of the machine,electronics,correspondence, aviationaerospace, chemicalengineering,mineral,living creature,medicalscience,military.etc.,all thereis EDA application.TheEDA te
10、chniquehasalreadyextensivelyusedineacharchdukedepartment,the Qi businessunit andresearchteachingsectioncurrently.Forexampleinthe airplanethe manufacturingthe process,from design,performancetest andcharacteristicanalyticaluntil fly emulation,mayinvolve anEDA technique.TheEDA techniquethatthis textpoi
11、nt mainly to the名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 1 页，共 4 页 - - - - - - - - - design,PCBdesignof theelectronicselectriccircuit andIC design. TheEDA designcanis dividedintosystemclass,electriccircuit classandphysicsto carryoutclass. TheEDA in commonusesof
12、tware:TheEDA tool pile up oneafteranotherandgetinto anour countrycurrentlyandhavetheEDA softwareofextensiveinfluenceto have:MultiSIM 7(the latestedition of original EWB), PSPICE,OrCAD, PCAD,Protel,Viewlogic, Mentor,Graphics,Synopsys,LSIIogic, Cadence, MicroSim, ISE,modelsimetc.Thesetools all havestr
13、ongerfunction, generallycanusedfor a few aspects, for examplea lot of softwaresallcancarry on an electric circuit designwith imitate really, togetherenteringcanalso carry on PCB toautomaticallysetup cloth line, canoutput variousnet form a documentwith the third squaresoftwareconnect.TheVHDL Englishf
14、ull namebetheHardwareDescription Languageof theIntegratedCircuit of theVery-High-Speed,birth in 1982.At the end of 1987, the VHDL is confirm by IEEE and AmericanMinistry of NationalDefenseto describelanguagefor thestandardhardware.Announced VHDL standardedition from theIEEE, IEEE-1076(call87 version
15、s)after,theeachEDA companyreleasedown VHDLdesign environment one after another, or declared that the own design tool can connect withVHDL.Henceforth the VHDL designed realm to get to extensively accept in the electronics,andgraduallyreplacedanoriginally not- standardhardwaredescriptionlanguage.In199
16、3,the IEEE carriedon to reviseto theVHDL, describeability to upexpanda VHDL contentsfrom higherabstractlayerandthesystem,announcedtheVHDL of newedition,namelyIEEE standardof 1076-1993editions,.(call 93versions)Now, VHDLand Verilog are the industrial standardhardwaredescription of the IEEEslanguage,a
17、gain arrive support of numerousEDA companies,at electronicsengineeringrealm, havebecomein generalusehardwareto describelanguagein fact.Thereis expertthink, in thenewcenturyin,the VHDL will start to undertakea greatly part of numerical systemdesign mission at the Veriloglanguage. TheVHDL languageisak
18、ind of deluxelanguagewhich usedsfor anelectriccircuit design.Itexpectsto appearafter the 80s of.BE at the beginning come out by American Ministry of NationalDefensedevelopmentto providethe Americansoliderwith the credibility which usesto raisea designwith cut1 kind of developmentperiodto usethescope
19、smallerdesignlanguage.All of VHDL Englisheswrite BE:TheDescriptiongLanguageof theVHSIC(theSpeedIntegratedofthe Very High Circuit) Hardware.Translatinginto Chineseis soon extremely high the descriptionlanguageof theintegratedcircuit hardware.Soit of theapplicationmainly is anapplicationin thedesignof
20、 numericalelectriccircuit.Currently,it is in theapplicationmostin Chinais the designwhich usesintheFPGA/CPLD/EPLD.Certainlyin someunitswith strongerrealstrenght,it isalsousetodesignASIC.The VHDL mainly usedsfor the structure,behaviorwhich describesnumericalsystem,functionwith connect.Inaddition to i
21、mplying many languagessentencewhich have a hardwarecharacteristic,VHDL languagesforms and descriptionstyle and sentenceconstructionare very similar at general名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 2 页，共 4 页 - - - - - - - - - calculatordeluxelanguage.VHDLproce
22、durestructurecharacteristics is anengineeringdesign,or call thatthe design entity(can be a component,an electric circuit mold piece or a system)is divided intoexterior(orcall but part,andport) with innerpart(orcall to cantseepart),sinceinvolve internalfunctionandcalculateway of entity to completepar
23、tof.At to 1 designedentity to defineexterior interfaceafter,onceit internaldevelopment completionafter,otherdesignscandirectlyadjustto usethisentity.Thiskindof will designentity to bedivided into a little bit basicVHDL systemthatis aVHDL systeminsidetheconceptof outsidepart designdesign of a little
24、bit basic and other hardwaredescribethe languagecompareand the VHDL hasa following characteristics: The function is strongand the design bevivid.The VHDL hasthe function strong languagestructure,can describea complicatedlogic controlwith the simple and direct and explicit sourcecode.It hasa multi-la
25、yer designdescriptionfunction, inmultiple layers thin turn, finally directly born electric circuit class description.TheVHDL supportssynchronouselectriccircuit, differencestreadelectriccircuit with randomthe designof electriccircuit,this be the otherhardwaredescriptionalthoughthe languagecantcompare
26、to.TheVHDL still supportsvariousdesignmethod,sincesupportfrom the bottomupwarddesign,supportagainfrom thedesignofcrestdeclivity;Sincethesupportmold pieceturnsa design,supportlayersturn adesignagain.Supportextensivelyandbe easyto a modification.Becausethe VHDL hasalreadybecomeIEEE standardthenorm of
27、hardwaredescriptionlanguage,mostEDA toolsalmostsupportVHDL currently,this is VHDLof further expansionwith extensivelyapplied lay foundation.In the design processof the hardwareelectriccircuit, the main designdocumentis the sourcecodewhich writes with the VHDL, theVHDLeasilyreadswith thestructureturn
28、,sobeeasyto amodificationdesign.The strong system hardwaredescribesability.The VHDL has a multi-layer design descriptionfunction,sincecandescribesystemclasselectriccircuit,candescribedoorclasselectriccircuit again.Anddescriptionsincecanadopta behaviordescription,deposita machineto deliver descriptio
29、nor structuredescription,canalsoadoptthehybrid descriptionof threesmixture.Moreover,VHDL supportis inertialto delayanddeliverto delay,canalsoaccuratelybuild uphardwareelectriccircuit model.VHDL supportpreparedefiniteof with from definition of datatype,bring hardwaredescriptionabiggerfreedomdegree,ma
30、kedesignthepersonnelcanexpedientlyestablishthesystemmodelof high time.Theindependenceis atthedesignof sparepart,havenothingto dowith thecraft.Dontneedto considera choicecompletionthe sparepart of designfirst while designinga personnelto carry on a designwith the VHDL, canconcentrate energyto carryon
31、 designof excellentturn.Whenthe designdescriptioncompleteafter,cancarryout its function with variousdifferent sparepartstructure. Very strongtransplantation ability.TheVHDL is akind of hardwaredescriptionfor standardize language,thesameof designdescriptioncanbesupportby thedifferenttoolandmaketo des
32、igntodescribeof thetransplantation makepossible.Be easyto a shareandreply to use.TheVHDL adoptioncanbuild up variousmold piecethat can名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 3 页，共 4 页 - - - - - - - - - againmakeuseof accordingto thedesignmethodof database(Libr
33、ary).These cannedin advancedesignor useto designa mediumbackupmold a piecebeforeanddeposittedtheseto thedatabase in, canbeinlaterlyof thedesigncarryon replyingto use,canmakethedesignresultbedesignthepersonnels to carryonexchanges andshare,decrease paredwith otherhardwaredescriptionlanguages, theVHDL
34、 havestrongerbehaviordescriptionability, cometoadecisionhim tobecomeasystemdesignrealmthebesthardwareadescriptionlanguagethus.Thestrongbehaviordescriptionability is toavertfrom concretesparepartstructureanddescribeanddesignimportantassurance of large-scale electronicssystemfrom thelogic behavior.the
35、 VHDL be abundantof imitate true languagesentenceanddatabase function, makein any bigsystemof thedesigncaninspecta function possibility of designthe systemin earlydays,can carry onimitating trueemulationto thedesignatanytime.the ability and procedurestructureof the behavior description with lexical
36、VHDL come to adecisionthe decompositionthathe hasto supportalarge-scaledesignwith havealreadyhavedesignofagainmakeuseof function.Meetthemarketdemandinglarge-scale systemefficiently, thecompletionofthehighspeedhasto includemanypeopletheseveralgenerationhairseteventogetherandabreastworksandthencancarr
37、yout.for usethedesignof anassurance of VHDL completion,canmakeuseof EDA tool to carryonlogiccomprehensive with excellentturn,andautoof theVHDL describethedesignchangeinto thedoorclassnetform.the descriptionof VHDL to designhaveoppositeand independent, the designcannot understandthestructureof hardwa
38、reandneednot managethetargetsparepartthattheenddesigncarryout,eitheriswhat,butcarryonanindependent design.Foundedin 1981,this year hasenteredthe Mentor of 25 years,is the oldestin the threemajorelectronicdesignautomation(EDA) vendors,andturnoveraheadof a competitorfour times,in additionto Mentor sys
39、temdesigntools, marketshare,ranking first in the world, especiallyin the PCB layout,Mentor strengthswhich also ranked first in the world, its turnover is a full 1.5 times the secondsupplier.To assistcustomersin China audiovisual application-specificmarkets,TechnicalSupportMentor thelargestpartof hum
40、aninput (in thepasteachyearis almostmorethanthreetimestherateofgrowth)in orderto strengthen theability of thePhysicaltheDesignandFunctionalArchitecture; andforthe continueddevelopmentof database managementtool is also sparedno effort in shipmentvolumegrowth of around20% in thepastfive years,15% of therevenueprogress,is the fastest-growingEDAmanufacturers.名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 4 页，共 4 页 - - - - - - - - -