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IS42VM81600E Datasheet(PDF) 8 Page - Integrated Silicon Solution, Inc |
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IS42VM81600E Datasheet(HTML) 8 Page - Integrated Silicon Solution, Inc |
8 / 24 page 8 Integrated Silicon Solution, Inc. - www.issi.com Rev. A 04/08/2011 IS42VM81600E / IS42VM16800E / IS42VM32400E IS45VM81600E / IS45VM16800E / IS45VM32400E Mobile SDRAM Functionality ISSI’s128MbMobileSDRAMsarepincompatibleandhavesimilarfunctionalitywithISSI’sstandardSDRAMs,but offerloweroperatingvoltagesandpowersavingfeatures.Fordetaileddescriptionsofpinfunctions,commandtruth tables,functionaltruthtables,deviceoperationaswellastimingdiagramspleaserefertoISSIdocument“Mobile SynchronousDRAMDeviceOperations&TimingDiagrams”listedatwww.issi.com REGISTER DEFINITION Mode Register (MR) & Extended Mode Register (EMR) TherearetwomoderegistersintheMobileSDRAM;ModeRegister(MR)andExtendedModeRegister(EMR).The ModeRegisterisdiscussedbelow,followedbytheExtendedModeRegister.TheModeRegisterisusedtodefine thespecificmodeofoperationoftheSDRAM.Thisdefinitionincludestheselectionofburstlength,abursttype,CAS Latency,operatingmode,andawriteburstmode.ThemoderegisterisprogrammedviatheLOADMODEREGISTER commandandwillretainthestoredinformationuntilitisprogrammedagainorthedevicelosespower. TheEMRcontrolsthefunctionsbeyondthosecontrolledbytheMR.Theseadditionalfunctionsarespecialfeatures oftheMobileSDRAM.Theyincludetemperature-compensatedselfrefresh(TCSR)control,partial-arrayselfrefresh (PASR),andoutputdrivestrength.TheEMRisprogrammedviatheMODEREGISTERSETcommandwithBA1 =1andBA0=0andretainsthestoredinformationuntilitisprogrammedagainorthedevicelosespower.Not programmingtheextendedmoderegisteruponinitializationwillresultindefaultsettingsforthelow-powerfeatures. Theextendedmodewilldefaultwiththetemperaturesensorenabled,fulldrivestrength,andfullarray(all4banks) refresh. Mode Register Definition TheMRisusedtodefinethespecificmodeofoperationoftheSDRAM.Thisdefinitionincludestheselectionofa burstlength,abursttype,aCASlatency,anoperatingmodeandawriteburstmode,asshowninFigureMODE REGISTERDEFINITION.ThemoderegisterisprogrammedviatheLOADMODEREGISTERcommandandwill retainthestoredinformationuntilitisprogrammedagainorthedevicelosespower. ModeregisterbitsM0-M2specifytheburstlength,M3specifiesthetypeofburst(sequentialorinterleaved),M4- M6specifytheCASlatency,M7andM8specifytheoperatingmode,M9specifiestheWRITEburstmode,andM10, M11,andM12arereservedforfutureuse. Themoderegistermustbeloadedwhenallbanksareidle,andthecontrollermustwaitthespecifiedtimebefore initiatingthesubsequentoperation.Violatingeitheroftheserequirementswillresultinunspecifiedoperation. |
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