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ID:40843809
大小:752.01 KB
页数:6页
时间:2019-08-08
《Lifetime of Phase Change Memories相变存寿命》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、201129thIEEEVLSITestSymposiumDesigningaFastandAdaptiveErrorCorrectionSchemeforIncreasingtheLifetimeofPhaseChangeMemoriesRudrajitDattaandNurA.ToubaComputerEngineeringResearchCenterUniversityofTexasatAustin,Austin,TX78712rudrajit.datta@mail.utexas.edu,touba@ece.utexas.eduAb
2、stracthighresistancestatebeinginterpretedasazeroandtheThispaperproposesanadaptivemulti-biterrorlowresistancestateasone.PCM,relyingonanalogcorrectingcodeforphasechangememoriesthatprovidescurrentandthermaleffects,doesnotrequirecontroloveramanifoldincreaseinthelifetimeofphas
3、echangediscreteelectrons.Astechnologiesscaleandheatingmemoriestherebymakingthemamoreviablealternativecontactareasshrink,programmingcurrentwillalsoscaleforDRAMmainmemory.Anovelaspectoftheproposedlinearly.PCMscalingmechanismhasbeendemonstratedapproachisthattheerrorcorrectio
4、ncode(ECC)isina20nmdeviceprototypeandisprojectedtoscaletoadaptedovertimeasthenumberoffailedcellsinthe9nm[Lee09].AsascalableDRAMalternative,PCMphasechangememoryaccumulates.Theoperatingcouldprovideaclearroadmapforincreasingmainsystem(OS)monitorsthenumberoferrorscorrectedona
5、memorydensityandcapacity.memoryline,andwhenthenumberoferrorsonalineHowever,onemajorchallengethatneedstobebeginstoexceedthestrengthoftheECCpresent,theECCaddressedforPCMisitslimitedwriteendurance.PCMstrengthisadaptivelyincreased.Asthishappens,thewritesinducethermalexpansion
6、andcontractionwithinperformanceofthememorysystemgracefullydegradesthestorageelement,degradinginjectioncontactsandbecausemorestorageistakenupbycheckbitsratherlimitingendurancetohundredsofmillionsofwritesperthandatabitstherebyreducingtheeffectivesizeofacellatcurrentprocesse
7、s.Incurrentdevices,aPCMcell7cachelinesincelessdatacanbebroughttothecacheontypicallysupportsaround10writes[Ferreira10].Thus,eachreadoperationtothePCMmainmemory.PCMwillwear-outquicklyifusedasamainmemory.ExperimentalresultsshowthatthelifetimeofaphaseThisisasignificantlimitat
8、ionandaprimereasonwhychangememorycanbesignificantlyextendedwhilePCMisnotyetareadysubstituteforDR
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