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1、附录B翻译原文ElectronicdesignautomationKeywordEDA;IC;VHDLlanguage;FPGAPROCESSDESCRIPTION.Threeobstaclesinparticularbedevilicdesignersinthisdawnofthesystemonachip.ThefirstisactuallyaShOrtfan-thehardwareandsoftwarecomponentsofthedesignlackaunifyinglanguage.Then,asthenumberoflogicgatesperchippassesthemillion
2、marks,verificationofadesig11,scorrectnessisfastbecomingmorearduousthandoingthedesignitself.Andfinally,notonlygatecountsbutchipfrequenciesalsoareclimbing,sothatgettingadesigntomeetitstimingrequirementswithouttoomanydesigniterationsisarecedinggoal.Asisthewontoftheelectronicdesignautomation(EDA)communi
3、ty,theseconcernsarebeingattackedbystart-upcompaniesledbyafewindividualswithbigideasandalittleseedmoney.PARLEZ-VOUSSUPERLOG?Asystemonachipcomprisesbothcircuitryandthesoftwarethatrunsonit.Suchadevicemaycontainanembeddedprocessorcorerunningasoftwaremodem.Mostoften,afterthechip,sfunctionalityisspelledou
4、t,usuallyonpaper,thehardwareCOm-potentishandedofftothecircuitdesignersandthesoftwareisgiventothepro-grammars,tomeetupagainatsomelaterdate.Thepartofthechipsfunctionalitythatwillendupaslogicgatesandtransistorsiswrit-teninahardwaredesignIanguage-VirologyorVHDL,whilethepartthatwillendupassoftwareismosto
5、ftendescribedintheprogramminglanguageCorC+.Theuseofthesedisparatelanguageshamperstheabilitytodescribe,model,anddebugthecircuitryoftheICandthesoftwareinacoherentfashion.Itistime,manyintheindustrybelieve,foranewdesignlanguagethatcancopewithbothhardwareandsoftwarefromtheinitialdesignspecificationrightt
6、hroughtofinalverification.JustsuchanewlanguagehasbeendevelopedbyCo-DesignAutomationInc.,SanJose,Calif.Beforelaunchingsuchanambitiousenterprise,cofoundersSimonDavidmann,whoisalsochiefoperatingofficer,andPeterFlakeruledouttheusefulnessofextendinganexistinglanguagetomeetSyStem-on-chipneeds.Amongthecand
7、idatesforextensionwereC,C+,Java,andVerilog.Adesignlanguageshouldsatisfythreerequirements,maintainedDavidmann.Itshouldunifythedesignprocess.Itshouldmakedesigningmoreefficient.Anditshouldevolveoutofanexistingmethodology.Noneoftheexistingapproachesfilledthebill.SoDavidmannandFlakesetaboutdevelopingnewc
8、o-designlanguagecalledSuperlog.AnaturalstartingpointwasablendofVirologyandCsincezzfromanalgorithmpointofview,alotofVirologyisbuiltonC,explainedDavidmann.ThentheyspicedtheblendwithbitsandpiecesofVHDLandJava.FromVirologyandVHDL,Superloghasacquiredtheabilitytodescribehardwareaspectsofthedesign,suchasse
9、quential,combinatorial,andmultivaluedlogic.FromCandJavaitinheritsdynamicprocessesandothersoftwareconstructs.Evenfunctionslikeinterfaces,protocols,andstatemachines,whichtillnowhaveoftenbeendoneonpaper,canbedescribedinthenewlanguage.Tosupportlegacycodewritteninahardwaredescriptionorprogramminglanguage
10、,SuperlogallowsbothVirologyandCmodulestobeimportedanduseddirectly.Itisimportantforthelanguagetobeinthepublicdomain,accordingtoDavidmann.Thecompanyhasalreadybeguntoworkwithvariousstandardsorganizationstothisend.Nottobeoverlookedistheneedforasuiteofdesigntoolsbasedonthelanguage.RecentlyCo-Designidenti
11、fiedanumberofelectronicdesignautomationcompanies,amongthemMagmaDesignAutomation,Sente,andViewlogic,thatwilldeveloptoolsbasedonSuperlog.Co-Designwillalsodevelopproductsforthefrontendofthedesignprocess.ARACETOTHEFINISHNoteveryoneisconvincedthatanewlanguageisneeded.SystemC,amodelingplatformthatextendst
12、hecapabilitiesandadvantagesofCC+intothehardwaredomainhasbeenproposedasanalternative.SuchlargeandpowerfulcompaniesasSynopsys,Coware,LucentTechnologies,andTexasInstrumentshavebandedtogetherundertheOpenSystemCInitiativetopromotetheirversionofthenext-generationdesignplatform.TogetSystemCofftoarunningsta
13、rt,thegroupoffersamodelingplatformfordownloadofftheirWebsitefreeofcharge.Theirhopeisalsotomaketheirplatformthedefactostandard.TherationalefordevelopingSystemCwasstraightforward,accordingtoJoachimKunkel,generalmanagerandvicepresidentoftheSystemLevelDesignBusinessUnitatSynopsys.Itwastohaveastandardlan
14、guageinwhichsemiconductorvendors,IPvendors,andsystemhousescouldexchangesystem-levelIPandexecutablespecifications,andtheelectronicdesignautomationindustrycoulddevelopinteroperabletools.SupportersofSystemCbelievethatthewould-bestandardhastobebasedonC+becauseitallowscapabilitiestobeaddedtoitwithoutleav
15、ingthelanguagestandard,KunkeltoldJEEESpectrum.MostsoftwaredevelopersuseC+andmanysystemsdevelopersuseC+alreadytodescribetheirsystemsatabehaviorallevel.Buttillnowithasnotbeenpossibletodescribehardwareusingthelanguage.ThedevelopersofSystemChavesolvedthatproblembydefiningnewC+classlibrariesandasimulatio
16、nkernelthatbringtoC+allofthecapabilitiesneededtodescribehardware.zzThesenewclassesimplementnewfunctionality,explainedKunkel.Forexample,bitvectors-stringsofzerosandones-andalltheoperationsthatyouwoulddoonthem.TheSystemCdevelopersalsoprovidedaclassofsignedandunsignednumbers,thenotionofasignal,andotherconceptsneededtomodelhardware.Therearestillsomeholes,however.Forexample,itisstillnotpossibletosynthesizeagate-levelnetlistfromaSystcmCdescription.Rut
