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IS42VS16400E-75TL Datasheet(PDF) 6 Page - Integrated Silicon Solution, Inc |
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IS42VS16400E-75TL Datasheet(HTML) 6 Page - Integrated Silicon Solution, Inc |
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6 / 58 page  IS42VS16400E 6 Integrated Silicon Solution, Inc. — www.issi.com Rev. A 05/15/09 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. The row address and bank to be refreshed are automatically generatedduringthisoperation. Thestipulatedperiod(trc)is requiredforasinglerefreshoperation,andnoothercom- mandscanbeexecutedduringthisperiod. Thiscommandis executedatleast4096timesevery64ms.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 periodequaltotras or may remain in self refresh mode foranindefiniteperiodbeyondthat.TheSELF-REFRESH operationcontinuesaslongastheCKEpinremainsLOW andthereisnoneedforexternalcontrolofanyotherpins. 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 When CSislow,theNOPcommandpreventsunwanted commands from being registered during idle or wait states. LOAD MODE REGISTER DuringtheLOADMODEREGISTERcommandthemode register is loaded from A0-A11. This command can only 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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