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IS42S16400 Datasheet(PDF) 9 Page - Integrated Silicon Solution, Inc |
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IS42S16400 Datasheet(HTML) 9 Page - Integrated Silicon Solution, Inc |
9 / 55 page Integrated Silicon Solution, Inc. — www.issi.com9 Rev. D 01/30/08 IS42S16400 TRUTH TABLE – CURRENT STATE BANK n, COMMAND TO BANK m (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 AnyCommandOtherwiseAllowedtoBankm X X X X Row ACTIVE(Selectandactivaterow) L L H H Activating, READ(SelectcolumnandstartREADburst)(7) L H L H Active,or WRITE(SelectcolumnandstartWRITEburst)(7) L H L L Precharging PRECHARGE L L H L Read ACTIVE(Selectandactivaterow) L L H H (Auto READ(SelectcolumnandstartnewREADburst)(7,10) L H L H Precharge WRITE(SelectcolumnandstartWRITEburst)(7,11) L H L L Disabled) PRECHARGE(9) L L H L Write ACTIVE(Selectandactivaterow) L L H H (Auto READ(SelectcolumnandstartREADburst)(7,12) L H L H Precharge WRITE(SelectcolumnandstartnewWRITEburst)(7,13) L H L L Disabled) PRECHARGE(9) L L H L Read ACTIVE(Selectandactivaterow) L L H H (WithAuto READ(SelectcolumnandstartnewREADburst)(7,8,14) L H L H Precharge) WRITE(SelectcolumnandstartWRITEburst)(7,8,15) L H L L PRECHARGE(9) L L H L Write ACTIVE(Selectandactivaterow) L L H H (WithAuto READ(SelectcolumnandstartREADburst)(7,8,16) L H L H Precharge) WRITE(SelectcolumnandstartnewWRITEburst)(7,8,17) L H L L PRECHARGE(9) L L H L NOTE: 1.ThistableapplieswhenCKEn-1wasHIGHandCKEnisHIGH(TruthTable-CKE)andaftertxsr has been met (if the previ- ous state was self refresh). 2.Thistabledescribesalternatebankoperation,exceptwherenoted;i.e.,thecurrentstateisforbankn and the commands shown are those allowed to be issued to bank m (assuming that bank m is in such a state that the given command is allowable).Excep- tions are covered in the notes below. 3. Current state definitions: Idle:Thebankhasbeenprecharged,andtrp has been met. RowActive:Arowinthebankhasbeenactivated,andtrcD has been met. No data bursts/accesses and no register accesses are in progress. Read:AREADbursthasbeeninitiated,withautoprechargedisabled,andhasnotyetterminatedorbeentermi- nated. Write:AWRITEbursthasbeeninitiated,withautoprechargedisabled,andhasnotyetterminatedorbeentermi- nated. Readw/Auto PrechargeEnabled:StartswithregistrationofaREADcommandwithautoprechargeenabled,andendswhentrp has been met.Oncetrp is met, the bank will be in the idle state. Write w/Auto PrechargeEnabled:StartswithregistrationofaWRITEcommandwithautoprechargeenabled,andendswhentrp has been met.Oncetrp is met, the bank will be in the idle state. 4.AUTOREFRESH,SELFREFRESHandLOADMODEREGISTERcommandsmayonlybeissuedwhenallbanksareidle. 5.ABURSTTERMINATEcommandcannotbeissuedtoanotherbank;itappliestothebankrepresentedbythecurrentstate only. 6. All states and sequences not shown are illegal or reserved. 7.READsorWRITEstobankmlistedintheCommand(Action)columnincludeREADsorWRITEswithautoprechargeenabled andREADsorWRITEswithautoprechargedisabled. |
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