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IS42S32800G-6BLI Datasheet(PDF) 5 Page - Integrated Silicon Solution, Inc |
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IS42S32800G-6BLI Datasheet(HTML) 5 Page - Integrated Silicon Solution, Inc |
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5 / 58 page  5 Integrated Silicon Solution, Inc. - www.issi.com Rev. A 07/18/2012 IS42S32800G, IS45S32800G GENERAL DESCRIPTION READ TheREADcommandselectsthebankfromBA0,BA1inputs and starts a burst read access to an active row. Inputs A0-A8providesthestartingcolumnlocation.WhenA10is HIGH,thiscommandfunctionsasanAUTOPRECHARGE command.Whentheautoprechargeisselected,therow beingaccessedwillbeprechargedattheendoftheREAD burst.Therowwillremainopenforsubsequentaccesses when AUTO PRECHARGE is not selected.DQ’s read dataissubjecttothelogiclevelontheDQMinputstwo clocksearlier.WhenagivenDQMsignalwasregistered HIGH,thecorrespondingDQ’swillbeHigh-Ztwoclocks later.DQ’swillprovidevaliddatawhentheDQMsignal wasregisteredLOW. WRITE A burst write access to an active row is initiated with the WRITE command.BA0, BA1 inputs selects the bank, and the starting column location is provided by inputs A0-A8.Whether or not AUTO-PRECHARGE is used is determined by A10. Therowbeingaccessedwillbeprechargedattheendof theWRITEburst,ifAUTOPRECHARGEisselected.If AUTOPRECHARGEisnotselected,therowwillremain open for subsequent accesses. A memory array is written with corresponding input data onDQ’sandDQMinputlogiclevelappearingatthesame time.DatawillbewrittentomemorywhenDQMsignalis LOW.WhenDQMisHIGH,thecorrespondingdatainputs willbeignored,andaWRITEwillnotbeexecutedtothat byte/column location. PRECHARGE The PRECHARGE command is used to deactivate the open row in a particular bank or the open row in all banks. BA0,BA1canbeusedtoselectwhichbankisprecharged or they are treated as “Don’t Care”.A10 determined whether one or all banks are precharged. After execut- ing this command, the next command for the selected bank(s) is executed after passage of the period t RP, which istheperiodrequiredforbankprecharging.Onceabank has been precharged, it is in the idle state and must be activatedpriortoanyREADorWRITEcommandsbeing issued to that bank. AUTO PRECHARGE TheAUTOPRECHARGEfunctionensuresthatthepre- charge is initiated at the earliest valid stage within a burst. Thisfunctionallowsforindividual-bankprechargewithout requiringanexplicitcommand.A10toenabletheAUTO PRECHARGEfunctioninconjunctionwithaspecificREAD orWRITEcommand.ForeachindividualREADorWRITE command, auto precharge is either enabled or disabled. AUTOPRECHARGEdoesnotapplyexceptinfull-page burst mode. Upon completion of the READ or WRITE burst, a precharge of the bank/row that is addressed is automatically performed. AUTO REFRESH COMMAND ThiscommandexecutestheAUTOREFRESHoperation. Therowaddressandbanktoberefreshedareautomatically generatedduringthisoperation. Thestipulatedperiod(trc) is required for a single refresh operation, and no other com- mandscanbeexecutedduringthisperiod. Thiscommand isexecutedatleast4096timesforeveryTref.Duringan AUTOREFRESHcommand,addressbitsare“Don’tCare”. ThiscommandcorrespondstoCBRAuto-refresh. BURST TERMINATE The BURSTTERMINATE command forcibly terminates the burst read and write operations by truncating either fixed-length or full-page bursts and the most recently registeredREADorWRITEcommandpriortotheBURST TERMINATE. COMMAND INHIBIT COMMANDINHIBITpreventsnewcommandsfrombeing executed.Operationsinprogressarenotaffected,apart fromwhethertheCLKsignalisenabled NO OPERATION WhenCSislow,theNOPcommandpreventsunwanted commands from being registered during idle or wait states. LOAD MODE REGISTER DuringtheLOADMODEREGISTERcommandthemode registerisloadedfromA0-A11.Thiscommandcanonly be issued when all banks are idle. ACTIVE COMMAND When the ACTIVE COMMAND is activated, BA0, BA1 inputs selects a bank to be accessed, and the address inputsonA0-A11selectstherow.UntilaPRECHARGE command is issued to the bank, the row remains open for accesses. |
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