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IS42S16400E-6T Datasheet(PDF) 7 Page - Integrated Silicon Solution, Inc |
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IS42S16400E-6T Datasheet(HTML) 7 Page - Integrated Silicon Solution, Inc |
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7 / 55 page  Integrated Silicon Solution, Inc. — www.issi.com 7 Rev. C 08/07/09 IS42S16400E TRUTH TABLE – CURRENT STATE BANK n, COMMAND TO BANK n (1-6) CURRENTSTATE COMMAND(ACTION) CS RAS CAS WE Any COMMANDINHIBIT(NOP/Continuepreviousoperation) H X X X NOOPERATION(NOP/Continuepreviousoperation) L H H H Idle ACTIVE(Selectandactivaterow) L L H H AUTOREFRESH(7) L L L H LOADMODEREGISTER(7) L L L L PRECHARGE(11) L L H L RowActive READ(SelectcolumnandstartREADburst)(10) L H L H WRITE(SelectcolumnandstartWRITEburst)(10) L H L L PRECHARGE(Deactivaterowinbankorbanks)(8) L L H L Read READ(SelectcolumnandstartnewREADburst)(10) L H L H (Auto WRITE(SelectcolumnandstartWRITEburst)(10) L H L L Precharge PRECHARGE(TruncateREADburst,startPRECHARGE)(8) L L H L Disabled) BURSTTERMINATE(9) L H H L Write READ(SelectcolumnandstartREADburst)(10) L H L H (Auto WRITE(SelectcolumnandstartnewWRITEburst)(10) L H L L Precharge PRECHARGE(TruncateWRITEburst,startPRECHARGE)(8) L L H L Disabled) BURSTTERMINATE(9) L H H L NOTE: 1.ThistableapplieswhenCKEn-1wasHIGHandCKEnisHIGH(seeTruthTable-CKE)andaftertxsr has been met (if the previous state was SELFREFRESH). 2.Thistableisbank-specific,exceptwherenoted;i.e.,thecurrentstateisforaspecificbankandthecommandsshownarethose allowedtobeissuedtothatbankwheninthatstate.Exceptionsarecoveredinthenotesbelow. TRUTH TABLE – CKE (1-4) CURRENT STATE COMMANDn ACTIONn CKEn-1 CKEn Power-Down X MaintainPower-Down L L SelfRefresh X MaintainSelfRefresh L L ClockSuspend X MaintainClockSuspend L L Power-Down(5) COMMANDINHIBITorNOP ExitPower-Down L H SelfRefresh(6) COMMANDINHIBITorNOP ExitSelfRefresh L H Clock Suspend(7) X ExitClockSuspend L H AllBanksIdle COMMANDINHIBITorNOP Power-DownEntry H L AllBanksIdle AUTOREFRESH SelfRefreshEntry H L ReadingorWriting VALID ClockSuspendEntry H L See TRUTH TABLE – CURRENT STATE BANK n, COMMAND TO BANK n H H NOTES: 1. CKEnisthelogicstateofCKEatclockedgen;CKEn-1 wasthestateofCKEatthepreviousclockedge. 2. CurrentstateisthestateoftheSDRAMimmediatelypriortoclockedgen. 3. COMMANDnisthecommandregisteredatclockedgen,andACTONnisaresultofCOMMANDn. 4. Allstatesandsequencesnotshownareillegalorreserved. 5. Exitingpower-downatclockedgen will put the device in the all banks idle state in time for clock edge n+1 (provided that tcks is met). 6. Exitingselfrefreshatclockedgen will put the device in all banks idle state once txsrismet.COMMANDINHIBITorNOP commands should be issued on clock edges occurring during the txsrperiod.AminimumoftwoNOPcommandsmustbesent during txsr period. 7. Afterexitingclocksuspendatclockedgen,thedevicewillresumeoperationandrecognizethenextcommandatclockedge n+1. |
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