hardwaresoftware co-design of multimedia embedded systems

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1、Hardware/SoftwareCo-designofMultimediaEmbeddedSystems:PeaCEApproach1.IntroductionAsdevelopmentofimplementationtechnologyisnotsloweddown,designofmultimediaembeddedsystemsbecomesmorechallengingduetotheincreasingsystemcomplexityaswellasrelentlesstime-to-marketpressure.Conventionalpracticeofd

2、esigningamultimediaembeddedsystemasshowninFigure1performsalgorithmdesign,hardwaredesign,andsoftwaredesignseparatelyandsequentially.Pastdesignexperiencesandsomeperformanceprofilingtechniquesareresortedtodetermineahardwarearchitecture.Afterthehardwarearchitectureisdecided,wedeterminewhichpa

3、rtsofthesystemfunctionsareimplementedinwhichcomponentsandperformsoftwaredevelopmentandhardwareprototypingconcurrently.Afterahardwareprototypeismade,developedsoftwarecodesaredownloadedintotheprogrammableprocessorsandverified.Sincetheexpectedgrowthrateofdesignproductivityinthisconventionald

4、esignmethodisfarbelowthatofsystemcomplexity,hardware/software(HW/SW)co-designhasemergedasanewdesignmethodologyinthepasttenyears.prototypeDebugging,optimizationSystemspecificationArchitecturedecisionPrototypingbyexpertstestHighcost&FunctionalinefficientsimulationdesignloopHWdevelopmentSoft

5、waredevelopmentECADtoolsSWdevelopmenttoolsFigure1.ConventionalDesignFlowAsasystematicsystem-leveldesignmethodology,HW/SWco-designmethodologynolongerseparateshardwaredesignandsoftwaredesign.Whenwedecidethehardwarearchitecture,weexplorethewiderangeoffeasibledesignsandevaluateeachonebyestima

6、tingtheexpectedperformanceafterconsideringallsubsequentdesigndecisionssuchashardware/softwarepartitioningandsoftwareimplementation.Asystematicdesignspaceexplorationneedsseparatespecificationoffunctionsandarchitectures.Anexplicitmappingstepmapspartsoffunctionalspecificationtoarchitecturebu

7、ildingblocks.Aftermappingiscompleted,weestimatetheexpectedperformanceandmaytriggerfurtheriterationsofarchitecturespecificationandmappinguntilwefindanoptimalarchitecture.Afteranoptimalarchitectureisfoundandmappingisdecided,moreaccurateperformanceverificationisneededb