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1、ACritical-Path-AwarePartialGatingApproachforTestPowerReductionMOHAMMEDELSHOUKRYUniversityofMarylandMOHAMMADTEHRANIPOORUniversityofConnecticutandC.P.RAVIKUMARTexasInstrumentsIndiaPowerreductionduringtestapplicationisimportantfromtheviewpointofchiprelia
2、bilityandforobtainingcorrecttestresults.Oneofthewaystoreducescantestpoweristoblocktransitionspropagatingfromtheoutputsofscancellsthroughcombinationallogic.Inordertoaccomplishthis,someresearchershaveproposedsettingprimaryinputstoappropriatevaluesoraddi
3、ngextragatesattheoutputsofscancells.Inthisarticle,wepointoutthelimitationsofsuchfullgatingtechniquesintermsofareaoverheadandperformancedegradation.Weproposeanalternatesolutionwhereapartialsetofscancellsisgated.Asubsetofscancellsisselectedtogivemaximum
4、reductionintestpowerwithinagivenareaconstraint.Analternateformulationoftheproblemistotreatmaximumpermittedtestpowerasaconstraintandachieveatestpowerthatiswithinthislimitusingthefewestnumberofgatedscancells,therebyleadingtotheleastimpactinareaoverhead.
5、Ourproblemformulationalsocomprehendsperformanceconstraintsandpreventstheinclusionofgatingpointsoncriticalpaths.Theareaoverheadispredictableandcloselycorrespondstotheaveragepowerreduction.CategoriesandSubjectDescriptors:B.8.1[PerformanceandReliability]
6、:Reliability,Testing,andFault-ToleranceGeneralTerms:Algorithms,Design,Economics,Experimentation,Performance,ReliabilityAdditionalKeyWordsandPhrases:Low-powertesting,scantesting,scancellgating,partialgatingApreliminaryversionofthisarticlehasbeenpublish
7、edinATS2005.Author’saddresses:M.Elshoukry,DepartmentofComputerScienceandElectricalEngineering,UniversityofMaryland,BaltimoreCounty,MD;email:elshoukry@umbc.edu;M.Tehranipoor,Elec-tricalandComputerEngineeringDepartment,UniversityofConnecticut,Storrs,CT0
8、6269-2157;email:tehrani@engr.uconn.edu;andC.P.Ravikumar,ASICProductDevelopmentCenter,TexasInstrumentsIndia,Bangalore560093,India;email:ravikumar@ti.com.Permissiontomakedigitalorhardcopiespartorallofthisworkforpersonalorclassroomuseisgrantedwit
