ASIC和FPGA架构的混合 A Hybrid ASIC and FPGA Architecture

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1、AHybridASICandFPGAArchitectureApplicationsEmergeforHybridDevicesImplementationusinganASICapproachtypicallyyieldsafaster,smaller,andlowerpowerdesignthanimplementationinFPGAtechnology.Thegrowingrequirementsinthemarketplacefordesignflexibilityhowever,aredrivingtheneedforhybridASIC/FPGAdevices.T

2、hepotentialtochangehardwareconfigurationinrealtime,tosupportmultipledesignoptionswithasinglemaskset,andtoproduct’susablelife,allcompeldesignerstolookforablendingofhighdensityASICcircuitsalongwiththeinherentFPGAcircuitflexibility.Theabilitytocreatea“basedesign”andthenreusethebasewithminimalch

3、angesforsubsequentdeviceshelpsreducedesigntimeandencouragesstandardization.Sincemanyconsumerandofficeproductsareofferedwitharangeoflowtohigh-endoptions,thisbasedesignconceptcanbeeffectivelyused-withfeaturesaddedtoeachsuccessivemodel.Printers,faxmachines,PC'sanddigitalimagingequipmentareexamp

4、leswherethisconceptcanbeuseful.DSPapplicationsarealsowellsuitedtoFPGAbecauseoftheFPGAsfastmultiplyandaccumulate(MAC)processingcapability.WhenbuildingaDSPsystem,thedesigncantakeadvantageofparallelstructuresandarithmeticalgorithmstominimizeresourcesandexceedperformanceofsingleormultiplepurpose

5、DSPdevices.DSPdesignersusingbothASICandFPGAwithinthesamedesigncanoptimizeasystemforperformancebeyondthecapabilitiesofeitherseparatecircuittechnology.OtherapplicationsthatlendthemselvestothehybridASIC/FPGAapproacharedesignsthatsupportmultiplestandardssuchasUSB,FireWireandCameraLink,inasingled

6、evice.Similarly,designsthatarefinalized,withtheexceptionofanyundefinedfeaturesoremergingstandards,areexcellentcandidatesforthistechnology.Withoutthebenefitofprogrammablelogic,thedesignermustdecidebetweentaping-outthechipknowingthatthePCIlogichasahighprobabilityforchange,orwaitinguntilthedesi

7、gnrequirementsarefirm–potentiallyimpactingtheendproduct’sschedule.WithbothprogrammablelogicandASICworkingtogetheronasingledevice,somesituationslikethesecanbeaccommodated.OthersimilarissueslikedifferinggeographicorI/Ostandardscouldalsobeincorporated