IS42S16400F
IC42S16400F
(1-6)
TRUTH TABLE – CURRENT STATE BANK n, COMMAND TO BANK m
CURRENTꢀSTATE
ꢀ
COMMANDꢀ(ACTION)
CS RAS CAS WE
Anyꢀ
COMMANDꢀINHIBITꢀ(NOP/Continueꢀpreviousꢀoperation)ꢀ
NOꢀOPERATIONꢀ(NOP/Continueꢀpreviousꢀoperation)ꢀ
AnyꢀCommandꢀOtherwiseꢀAllowedꢀtoꢀBankꢀm
ACTIVEꢀ(Selectꢀandꢀactivateꢀrow)ꢀ
READꢀ(SelectꢀcolumnꢀandꢀstartꢀREADꢀburst)(7)ꢀ
WRITEꢀ(SelectꢀcolumnꢀandꢀstartꢀWRITEꢀburst)(7)ꢀ
PRECHARGEꢀ
Hꢀ
Lꢀ
Xꢀ
Lꢀ
Lꢀ
Lꢀ
Lꢀ
Lꢀ
Lꢀ
Lꢀ
Lꢀ
Lꢀ
Lꢀ
Lꢀ
Lꢀ
Lꢀ
Lꢀ
Lꢀ
Lꢀ
Lꢀ
Lꢀ
Lꢀ
Lꢀ
Xꢀ
Hꢀ
Xꢀ
Lꢀ
Xꢀ
Hꢀ
Xꢀ
Hꢀ
Lꢀ
X
H
X
H
H
L
ꢀ
Idleꢀ
Rowꢀ
Activating,ꢀ
Active,ꢀorꢀ
Prechargingꢀ
Readꢀ
Hꢀ
Hꢀ
Lꢀ
Lꢀ
Hꢀ
Hꢀ
Lꢀ
L
ACTIVEꢀ(Selectꢀandꢀactivateꢀrow)ꢀ
Lꢀ
H
H
L
(Autoꢀ
READꢀ(SelectꢀcolumnꢀandꢀstartꢀnewꢀREADꢀburst)(7,10)
ꢀ
Hꢀ
Hꢀ
Lꢀ
Prechargeꢀ
Disabled)ꢀ
Writeꢀ
WRITEꢀ(SelectꢀcolumnꢀandꢀstartꢀWRITEꢀburst)(7,11)
PRECHARGE(9)ꢀ
ꢀ
Lꢀ
Hꢀ
Hꢀ
Lꢀ
L
ACTIVEꢀ(Selectꢀandꢀactivateꢀrow)ꢀ
Lꢀ
H
H
L
(Autoꢀ
READꢀ(SelectꢀcolumnꢀandꢀstartꢀREADꢀburst)(7,12)
ꢀ
Hꢀ
Hꢀ
Lꢀ
Prechargeꢀ
Disabled)ꢀ
Readꢀ
WRITEꢀ(SelectꢀcolumnꢀandꢀstartꢀnewꢀWRITEꢀburst)(7,13)
PRECHARGE(9)ꢀ
ꢀ
Lꢀ
Hꢀ
Hꢀ
Lꢀ
L
ACTIVEꢀ(Selectꢀandꢀactivateꢀrow)ꢀ
Lꢀ
H
H
L
(WithꢀAutoꢀ
Precharge)ꢀ
ꢀ
READꢀ(SelectꢀcolumnꢀandꢀstartꢀnewꢀREADꢀburst)(7,8,14)
ꢀ
Hꢀ
Hꢀ
Lꢀ
WRITEꢀ(SelectꢀcolumnꢀandꢀstartꢀWRITEꢀburst)(7,8,15)
PRECHARGE(9)ꢀ
ꢀ
Lꢀ
Hꢀ
Hꢀ
Lꢀ
L
Writeꢀ
ACTIVEꢀ(Selectꢀandꢀactivateꢀrow)ꢀ
Lꢀ
H
H
L
(WithꢀAutoꢀ
Precharge)ꢀ
ꢀ
READꢀ(SelectꢀcolumnꢀandꢀstartꢀREADꢀburst)(7,8,16)
ꢀ
Hꢀ
Hꢀ
Lꢀ
WRITEꢀ(SelectꢀcolumnꢀandꢀstartꢀnewꢀWRITEꢀburst)(7,8,17)
PRECHARGE(9)ꢀ
ꢀ
Lꢀ
Hꢀ
L
NOTE:ꢀ
ꢀ 1.ꢀThisꢀtableꢀappliesꢀwhenꢀCKEꢀn-1ꢀwasꢀHIGHꢀandꢀCKEꢀnꢀisꢀHIGHꢀ(TruthꢀTableꢀ-ꢀCKE)ꢀandꢀafterꢀtx s r has been met (if the previ-
ous state was self refresh).
ꢀ 2.ꢀThisꢀtableꢀdescribesꢀalternateꢀbankꢀoperation,ꢀexceptꢀwhereꢀnoted;ꢀi.e.,ꢀtheꢀcurrentꢀstateꢀisꢀforꢀbankꢀn 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:ꢀTheꢀbankꢀhasꢀbeenꢀprecharged,ꢀandꢀtr p has been met.
RowꢀActive:ꢀAꢀrowꢀinꢀtheꢀbankꢀhasꢀbeenꢀactivated,ꢀandꢀtr c D has been met. No data bursts/accesses and no register
accesses are in progress.
ꢀ
ꢀ
ꢀ
Read:ꢀAꢀREADꢀburstꢀhasꢀbeenꢀinitiated,ꢀwithꢀautoꢀprechargeꢀdisabled,ꢀandꢀhasꢀnotꢀyetꢀterminatedꢀorꢀbeenꢀtermi-
nated.
Write:ꢀAꢀWRITEꢀburstꢀhasꢀbeenꢀinitiated,ꢀwithꢀautoꢀprechargeꢀdisabled,ꢀandꢀhasꢀnotꢀyetꢀterminatedꢀorꢀbeenꢀtermi-
nated.
Readꢀw/Auto
PrechargeꢀEnabled:ꢀStartsꢀwithꢀregistrationꢀofꢀaꢀREADꢀcommandꢀwithꢀautoꢀprechargeꢀenabled,ꢀandꢀendsꢀwhenꢀtr p has been
met.ꢀOnceꢀtr p is met, the bank will be in the idle state.
Write w/Auto
PrechargeꢀEnabled:ꢀStartsꢀwithꢀregistrationꢀofꢀaꢀWRITEꢀcommandꢀwithꢀautoꢀprechargeꢀenabled,ꢀandꢀendsꢀwhenꢀtr p has been
met.ꢀOnceꢀtr p is met, the bank will be in the idle state.
ꢀ 4.ꢀAUTOꢀREFRESH,ꢀSELFꢀREFRESHꢀandꢀLOADꢀMODEꢀREGISTERꢀcommandsꢀmayꢀonlyꢀbeꢀissuedꢀwhenꢀallꢀbanksꢀareꢀidle.
ꢀ 5.ꢀAꢀBURSTꢀTERMINATEꢀcommandꢀcannotꢀbeꢀissuedꢀtoꢀanotherꢀbank;ꢀitꢀappliesꢀtoꢀtheꢀbankꢀrepresentedꢀbyꢀtheꢀcurrentꢀstateꢀ
only.
6. All states and sequences not shown are illegal or reserved.
ꢀ 7.ꢀREADsꢀorꢀWRITEsꢀtoꢀbankꢀmꢀlistedꢀinꢀtheꢀCommandꢀ(Action)ꢀcolumnꢀincludeꢀREADsꢀorꢀWRITEsꢀwithꢀautoꢀprechargeꢀenabledꢀ
andꢀREADsꢀorꢀWRITEsꢀwithꢀautoꢀprechargeꢀdisabled.
Integrated Silicon Solution, Inc. — www.issi.com
9
Rev. A
03/19/08
ISSI [ INTEGRATED SILICON SOLUTION, INC ]
