Calculating Memory System Power for DDR3r

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1、TN-41-01:CalculatingMemorySystemPowerforDDR3IntroductionTechnicalNoteCalculatingMemorySystemPowerforDDR3IntroductionDDR3SDRAMprovidesadditionalbandwidthoverpreviousDDRandDDR2SDRAM.Inadditiontothepremiumperformance,DDR3hasaloweroperatingvoltagerange.Theresultcanbeahigherband

2、widthperformingsystemwhileconsumingequalorlesssystempower.However,itisnotalwayseasytodeterminethepowerconsumptionwithinasystemapplicationfromthedatasheetspecification.ThistechnicalnotedetailshowDDR3SDRAMconsumespowerandprovidesthetoolsthatsystemdesignerscanusetoestimatepowe

3、rconsumptioninanyspecificsystem.Inadditiontoofferingtoolsandtechniquesforcalculatingsystempower,Micron’sDDR3-1067“DataSheetSpecifications”onpage20andaDDR3PowerSpreadsheetUsageExampleonpage20areprovided.Table1describesthecommandabbreviationsfoundinthefollowingsections.Table1

4、:AbbreviationDefinitionsAbbreviationDefinitionACTACTIVATEBLBurstlengthBCBurstchopPREPRECHARGEODTOn-dieterminationRDREADREFREFRESHWRWRITEDRAMOperationToestimatethepowerconsumptionofaDDR3SDRAM,itisnecessarytounderstandthebasicfunctionalityofthedevice(seeFigure1onpage2).Theope

5、rationofaDDR3deviceissimilartothatofaDDR2.Forbothdevices,themasteroperationoftheDRAMiscontrolledbyclockenable(CKE).IfCKEisLOW,theinputbuffersareturnedoff.ToallowtheDRAMtoreceivecommands,CKEmustbeHIGH,thusenablingtheinputbuffersandpropagatesthecommand/addressintothelogic/dec

6、odersontheDRAM.Duringnormaloperation,thefirstcommandsenttotheDRAMistypicallyanACTcommand.Thiscommandselectsabankandrowaddress.Thedata,whichisstoredinthecellsoftheselectedrow,isthentransferredfromthearrayintothesenseamplifiers.TheportionoftheDRAMconsumingpowerintheACTcommand

7、isshowninblueandgoldinFigure1onpage2.PDF:09005aef829559ff/Source:09005aef828dcdbfMicronTechnology,Inc.,reservestherighttochangeproductsorspecificationswithoutnotice.TN41_01DDR3Power.fm-Rev.B8/07EN1©2007MicronTechnology,Inc.Allrightsreserved.Productsandspecificationsdiscusse

8、dhereinareforevaluationandreferencepurposesonlyandaresubjecttochangebyMicronwithou