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1、CHAPTERGettingStartedwithDSPs29OnceyoudecidethataDigitalSignalProcessorisrightforyourapplication,youneedawaytogetstarted.Manymanufacturerswillsellyoualowcostevaluationkit,allowingyoutoexperiencetheirproductsfirst-hand.Theseareagreateducationaltool;itdoesn'tmatterifyouareanoviceo
2、rapro,theyarethebestwaytobecomefamiliarwithaparticularDSP.For®instance,AnalogDevicesprovidestheEZ-KITLitetoteachpotentialcustomersaboutits®SHARCfamilyofDigitalSignalProcessors.Foronly$179,youreceiveallthehardwareandsoftwareyouneedtoseetheDSPinaction.Thisincludes"canned"programsp
3、rovidedwiththekit,aswellasapplicationsyoucanwriteyourselfinassemblyorC.SupposeyoubuyoneofthesekitsfromAnalogDevicesandplaywithitforafewdays.Thischapterisanoverviewofwhatyoucanexpecttofindandlearn.TheADSP-2106xfamilyInthelastchapterwelookedatthegeneraloperationoftheADSP-2106x"SHA
4、RC"familyofDigitalSignalProcessors.Table29-1showsthevariousmembersofthisfamily.Allthesedevicesusethesamearchitecture,buthavedifferentamountsofon-chipmemory,akeyfactorindecidingwhichonetouse.MemoryaccessisacommonbottleneckinDSPsystems.TheSHARCDSPsaddressthisbyprovidinganamplesupp
5、lyofon-chipdual-portedSRAM.However,thelastthingyouwanttodoispayformorememorythanyouneed.DSPsoftengointocostsensitiveproducts,suchascellulartelephonesandCDplayers.Inotherwords,theorganizationofthisfamilyisdeterminedbymarketingaswellastechnology.TheoldestmemberofthisfamilyistheADS
6、P-21020.Thischipcontainsthecorearchitecture,butdoesnotincludeon-chipmemoryorI/Ohandling.Thismeansitcannotfunctionasastand-alonecomputer;itrequiresexternalcomponentstobeafunctionalsystem.TheotherdevicesarecompleteSHARC,EZ-KIT,EZ-LAB,VisualDSP,EZ-ICE,theSHARClogo,theAnalogDevicesl
7、ogo,andtheVisualDSPlogoareregisteredtrademarksofAnalogDevices,Inc.535536TheScientistandEngineer'sGuidetoDigitalSignalProcessingPRODUCTMemoryNotesQuad-SHARC,FourADSP-21060'sintheAD1460samemodule;providesanincredible4804Mbit×4MFLOPSinonly2.05"×2.05"×0.16".New!FeaturesSingleInstruc
8、tionMultipleADSP-21160M4MbitData(SIMD)corearchi
