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IS45S16400J Datasheet(PDF) 7 Page - List of Unclassifed Manufacturers |
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IS45S16400J Datasheet(HTML) 7 Page - List of Unclassifed Manufacturers |
7 / 60 page Integrated Silicon Solution, Inc. — www.issi.com 7 Rev. F 12/17/2013 IS42S16400J IS45S16400J READ TheREADcommandselectsthebankfromBA0,BA1inputs and starts a burst read access to an active row. Inputs A0-A7providesthestartingcolumnlocation.WhenA10is HIGH,thiscommandfunctionsasanAUTOPRECHARGE command.Whentheautoprechargeisselected,therow beingaccessedwillbeprechargedattheendoftheREAD burst.Therowwillremainopenforsubsequentaccesses when AUTO PRECHARGE is not selected.DQ’s read data is subject to the logic level on the DQM inputs two 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-A7.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. Data will be written to memory when DQM signal is LOW.WhenDQMisHIGH,thecorrespondingdatainputs willbeignored,andaWRITEwillnotbeexecutedtothat byte/column location. PRECHARGE ThePRECHARGEcommandisusedtodeactivatetheopen rowinaparticularbankortheopenrowinallbanks.BA0, BA1canbeusedtoselectwhichbankisprechargedorthey aretreatedas“Don’tCare”.A10determineswhetherone or all banks are precharged.After executing this command, the next command for the selected bank(s) is executed after passage of the period t RP, which is the period required for bankprecharging.Onceabankhasbeenprecharged,it isintheidlestateandmustbeactivatedpriortoanyREAD orWRITEcommandsbeingissuedtothatbank. AUTO PRECHARGE The AUTO PRECHARGE function ensures that the precharge is initiated at the earliest valid stage within a burst.Thisfunctionallowsforindividual-bankprecharge without requiring an explicit command. A10 can be used toenabletheAUTOPRECHARGEfunctioninconjunc- tionwithaspecificREADorWRITEcommand.Foreach individualREADorWRITEcommand,autoprechargeis eitherenabledordisabled.AUTOPRECHARGEdoesnot applyexceptinfull-pageburstmode.Uponcompletionof theREADorWRITEburst,aprechargeofthebank/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 isexecutedatleast4096timeseveryTref.DuringanAUTO REFRESHcommand,addressbitsare“Don’tCare”.This commandcorrespondstoCBRAuto-refresh. SELF REFRESH DuringtheSELFREFRESHoperation,therowaddressto be refreshed, the bank, and the refresh interval are gen- eratedautomaticallyinternally.SELFREFRESHcanbe usedtoretaindataintheSDRAMwithoutexternalclocking, eveniftherestofthesystemispowereddown.TheSELF REFRESHoperationisstartedbydroppingtheCKEpin fromHIGHtoLOW.DuringtheSELFREFRESHoperation allotherinputstotheSDRAMbecome“Don’tCare”.The device must remain in self refresh mode for a minimum period equal to tras or may remain in self refresh mode foranindefiniteperiodbeyondthat.TheSELF-REFRESH operationcontinuesaslongastheCKEpinremainsLOW and there is no need for external control of any other pins. Thenextcommandcannotbeexecuteduntilthedevice internal recovery period (trc) has elapsed. Once CKE goesHIGH,theNOPcommandmustbeissued(minimum of two clocks) to provide time for the completion of any internal refresh in progress. After the self-refresh, since it is impossible to determine the address of the last row to berefreshed,anAUTO-REFRESHshouldimmediatelybe performed for all addresses. 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. |
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