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1、CHAPTERGettingStartedwithDSPs29OnceyoudecidethataDigitalSignalProcessorisrightforyourapplication,youneedawaytogetstarted.Manymanufacturerswillsellyoualowcostevaluationkit,allowingyoutoexperiencetheirproductsfirst-hand.Theseareagreateducationaltool;itdoesn'tmatterifyouareanoviceorapro,theyareth
2、ebestwaytobecomefamiliarwithaparticularDSP.For®instance,AnalogDevicesprovidestheEZ-KITLitetoteachpotentialcustomersaboutits®SHARCfamilyofDigitalSignalProcessors.Foronly$179,youreceiveallthehardwareandsoftwareyouneedtoseetheDSPinaction.Thisincludes"canned"programsprovidedwiththekit,aswellasappl
3、icationsyoucanwriteyourselfinassemblyorC.SupposeyoubuyoneofthesekitsfromAnalogDevicesandplaywithitforafewdays.Thischapterisanoverviewofwhatyoucanexpecttofindandlearn.TheADSP-2106xfamilyInthelastchapterwelookedatthegeneraloperationoftheADSP-2106x"SHARC"familyofDigitalSignalProcessors.Table29-1s
4、howsthevariousmembersofthisfamily.Allthesedevicesusethesamearchitecture,buthavedifferentamountsofon-chipmemory,akeyfactorindecidingwhichonetouse.MemoryaccessisacommonbottleneckinDSPsystems.TheSHARCDSPsaddressthisbyprovidinganamplesupplyofon-chipdual-portedSRAM.However,thelastthingyouwanttodois
5、payformorememorythanyouneed.DSPsoftengointocostsensitiveproducts,suchascellulartelephonesandCDplayers.Inotherwords,theorganizationofthisfamilyisdeterminedbymarketingaswellastechnology.TheoldestmemberofthisfamilyistheADSP-21020.Thischipcontainsthecorearchitecture,butdoesnotincludeon-chipmemoryo
6、rI/Ohandling.Thismeansitcannotfunctionasastand-alonecomputer;itrequiresexternalcomponentstobeafunctionalsystem.TheotherdevicesarecompleteSHARC,EZ-KIT,EZ-LAB,VisualDSP,EZ-ICE,theSHARClogo,theAnalogDeviceslogo,andtheVisualDSPlogoareregisteredtrademarksofAnalogDevices,Inc.535536TheScientistandEng
7、ineer'sGuidetoDigitalSignalProcessingPRODUCTMemoryNotesQuad-SHARC,FourADSP-21060'sintheAD1460samemodule;providesanincredible4804Mbit×4MFLOPSinonly2.05"×2.05"×0.16".New!FeaturesSingleInstructionMultipleADSP-21160M4MbitData(SIMD)corearchi
