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1、AnalysisandImplementationofChargeRecyclingforDeepSub-micronBusesPaulP.SotiriadisTheodorosKonstantakopoulosAnanthaChandrakasanDepartmentofEECSDepartmentofEECSDepartmentofEECSMassachusettsInst.ofTechnologyMassachusettsInst.ofTechnologyMassachusettsInst.ofTechnologypps@mit.edutkonsta@mit.eduana
2、ntha@mtl.mit.eduABSTRACT:Chargerecyclinghasbeenproposedasastrategytoline1line2line3.---linenreducethepowerdissipationindatabuses.Previousworkinthisareawasbasedonsimplifiedbusmodelsthatignoredthecouplingbetweenthelines.HereweproposeanewChargeRecyclingTech-nique(CRT)appropriateforsub-microntec
3、hnologies.CRTisana-lyzedmathematicallyusingabusenergymodelthatcapturestheenergylossduetostronglinetolinecapacitivecoupling.IntheoryCRTcanresulttoenergyreductionofafactorof2.ItbecomesevenmoreenergyefficientwhencombinedwithBusInvertcoding(Stan--‘97,[6]).Acircuithasbeendesignedandsimulatedwitha
4、llparasiticFigure1:Sub-micronenergy-equivalentBusModelelementsextractedfromthelayout.Takingintoaccountthecircuitenergyoverheadthenetresultinenergysavingcanbeupto32%.2.SUB-MICRONBusMODEL1.INTRODUCTIONThesub-micronbusenergymodelweusetoevaluatethedifferentOverthepastseveralyears,significantemph
5、asishasbeenplacedenergiesisshowninFigure1.Ithasbeenprovenin[7]thatthisonreducingtheenergydissipationassociatedwithonchipcom-modelhasidenticalenergybehaviortoitsdistributedversion.C,munication.Numerousschemeshavebeenpresentedforreduc-ingenergyassociatedwithdrivingwiresincludinglowswingistheca
6、pacitancebetweeneachlineandthegroundandC,isthesignaling[1],[2],[3],chargere-cycling[4],[5]anddatacodingcapacitancebetweenadjacentlines.(Thecapacitancebetween[6],[7],[8].InthispaperweintroduceanewpracticalChargenon-adjacentlinesisveryweakandcanbeignored).WedefineRecyclingTechnique(CRT)appropr
7、iateforsub-microntechnol-thetechnologydependentparameterh=C,/CL.For.18~tech-ogybuses.Itsperformanceisverifiedbybothmathematicalanal-ysisandcircuitimplementation.nology,hisabout5.Also,htendstoincreasewithtechnologyscaling.Thetechnique,basedoncharger
