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1、EDATechnology,VHDLAndSoftware1.IntroductiontoEDAtechnologyEDAistheabbreviationofElectronicDesignAutomation.Intheearly1990s,itdevelopfromtheconceptssuchascomputeraidedDesign(CAD),computeraidedmanufacturing(CAM),computeraidedtesting(CAT)andcomputeraidedengineering(CAE
2、).EDAtechnologyisthecoreofthemodernelectronicdesigntechniques,whichrelyonpowerfulcomputers.InEDAtoolssoftwareplatform,computerautomaticallycompleteslogicsimplification,logicalpartitions,logicsynthesis,logicoptimizationlogicalsimulationandotherfunctionsuntiltheelectr
3、oniccircuitsystemachievesthestatedperformance.However,therealizationofthesefunctionbasesonthedescriptionofthesystemusingthehardwaredescriptionlanguageHDL(HardwareDescriptionlanguage).EDAtechnologyisacomputersoftwaresystem,whichisdevelopedonthebasisofelectronicCADtec
4、hnology.Itmergeshelatestachievementsofelectronicproducts,suchasapplicationofelectronictechnology,computertechnologyandinformationprocessingandintelligenttechnologytogethertodesignautomaticallybycomputerworkingplatform.UsingEDAtools,electronicstylistcanfinishfromconc
5、ept,algorithm,agreement,etc,begintodesignyourelectronicsystemalotworkcanbefinishedbycomputerandelectronicproductscanbefromcircuitdesign,performanceanalysistodesigntheICterritoryorPCBlayoutthewholeprocessofthecomputerautomaticallycompletetheprocessing.Nowontheconcept
6、ofusingEDAorcategoryverywide.Includedinmachinery,electronics,communication,aerospace,chemical,mineral,biology,medicine,militaryandotherfields,haveEDAapplications.CurrentEDAtechnologyhasinbigcompanies,enterprises,institutionsandteachingresearchdepartmentsextensiveuse
7、.Forexampleintheaircraftmanufacturingprocess,fromdesign,performancetestingandcharacteristicanalysisuntilaflightsimulator,allmayinvolveEDAtechnology.Globalization-theEDAtechnology,mainlyinelectroniccircuitdesign,PCBdesignandICdesign.EDAcanbedividedintosystemlevelandc
8、ircuit-levelandphysicalimplementationlevel.2.IntroductiontoVHDL2.1HardwareDescriptionLanguageHardwaredescriptionlanguage(HDLs)areapopularm