IS42S16400F
IC42S16400F
TRUTH TABLE – CKE (1-4)
CURRENT STATE
COMMANDn
ACTIONn
CKEn-1
CKEn
Power-Downꢀ
Xꢀ
MaintainꢀPower-Downꢀ
MaintainꢀSelfꢀRefreshꢀ
MaintainꢀClockꢀSuspendꢀ
ExitꢀPower-Downꢀ
ExitꢀSelfꢀRefreshꢀ
Lꢀ
Lꢀ
Lꢀ
Lꢀ
Lꢀ
Lꢀ
Hꢀ
Hꢀ
Hꢀ
L
L
SelfꢀRefreshꢀ
Xꢀ
ClockꢀSuspendꢀ
Power-Down(5)
SelfꢀRefresh(6)ꢀ
Clock Suspend(7)ꢀ
AllꢀBanksꢀIdleꢀ
AllꢀBanksꢀIdleꢀ
ReadingꢀorꢀWritingꢀ
Xꢀ
L
COMMANDꢀINHIBITꢀorꢀNOPꢀ
COMMANDꢀINHIBITꢀorꢀNOPꢀ
Xꢀ
H
H
H
L
ExitꢀClockꢀSuspendꢀ
Power-DownꢀEntryꢀ
SelfꢀRefreshꢀEntryꢀ
ClockꢀSuspendꢀEntryꢀ
COMMANDꢀINHIBITꢀorꢀNOPꢀ
AUTOꢀREFRESHꢀ
VALIDꢀ
L
L
See TRUTH TABLE – CURRENT STATE BANK n, COMMAND TO BANK n
H
H
NOTES:
1.ꢀ CKEnꢀisꢀtheꢀlogicꢀstateꢀofꢀCKEꢀatꢀclockꢀedgeꢀn;ꢀCKEn-1 wasꢀtheꢀstateꢀofꢀCKEꢀatꢀtheꢀpreviousꢀclockꢀedge.ꢀ
2.ꢀ CurrentꢀstateꢀisꢀtheꢀstateꢀofꢀtheꢀSDRAMꢀimmediatelyꢀpriorꢀtoꢀclockꢀedgeꢀn.
3.ꢀ COMMANDnꢀisꢀtheꢀcommandꢀregisteredꢀatꢀclockꢀedgeꢀn,ꢀandꢀACTONnꢀisꢀaꢀresultꢀofꢀCOMMANDn.
4. All states and sequences not shown are illegal or reserved.
5.ꢀ Exitingꢀpower-downꢀatꢀclockꢀedgeꢀn will put the device in the all banks idle state in time for clock edge n+1 (provided that tc k s is
met)
.
6.ꢀ Exitingꢀselfꢀrefreshꢀatꢀclockꢀedgeꢀn will put the device in all banks idle state once tx s r ꢀisꢀmet.ꢀCOMMANDꢀINHIBITꢀorꢀNOPꢀ
commands should be issued on clock edges occurring during the tx s r ꢀperiod.ꢀAꢀminimumꢀofꢀtwoꢀNOPꢀcommandsꢀmustꢀbeꢀsentꢀ
during tx s r period.
7.ꢀ Afterꢀexitingꢀclockꢀsuspendꢀatꢀclockꢀedgeꢀn,ꢀtheꢀdeviceꢀwillꢀresumeꢀoperationꢀandꢀrecognizeꢀtheꢀnextꢀcommandꢀatꢀclockꢀedgeꢀ
n+1.
TRUTH TABLE – CURRENT STATE BANK n, COMMAND TO BANK n (1-6)
CURRENTꢀSTATE
ꢀ
COMMANDꢀ(ACTION)
CS RAS CAS WE
Anyꢀ
COMMANDꢀINHIBITꢀ(NOP/Continueꢀpreviousꢀoperation)
ꢀ
Hꢀ
Lꢀ
Lꢀ
Lꢀ
Lꢀ
Lꢀ
Lꢀ
Lꢀ
Lꢀ
Lꢀ
Lꢀ
Lꢀ
Lꢀ
Lꢀ
Lꢀ
Lꢀ
Lꢀ
Xꢀ
Hꢀ
Lꢀ
Xꢀ
Hꢀ
Hꢀ
Lꢀ
X
H
H
H
L
ꢀ
NOꢀOPERATIONꢀ(NOP/Continueꢀpreviousꢀoperation)
ACTIVEꢀ(Selectꢀandꢀactivateꢀrow)ꢀ
ꢀAUTOꢀREFRESH(7)ꢀ
ꢀ
Idleꢀ
ꢀ
Lꢀ
ꢀ
LOADꢀMODEꢀREGISTER(7)ꢀ
PRECHARGE(11)
Lꢀ
Lꢀ
ꢀ
Lꢀ
Hꢀ
Lꢀ
L
RowꢀActiveꢀ
ꢀ
READꢀ(SelectꢀcolumnꢀandꢀstartꢀREADꢀburst)(10)
WRITEꢀ(SelectꢀcolumnꢀandꢀstartꢀWRITEꢀburst)(10)
PRECHARGEꢀ(Deactivateꢀrowꢀinꢀbankꢀorꢀbanks)(8)
READꢀ(SelectꢀcolumnꢀandꢀstartꢀnewꢀREADꢀburst)(10)
WRITEꢀ(SelectꢀcolumnꢀandꢀstartꢀWRITEꢀburst)(10)
PRECHARGEꢀ(TruncateꢀREADꢀburst,ꢀstartꢀPRECHARGE)(8)
BURSTꢀTERMINATE(9)
READꢀ(SelectꢀcolumnꢀandꢀstartꢀREADꢀburst)(10)
WRITEꢀ(SelectꢀcolumnꢀandꢀstartꢀnewꢀWRITEꢀburst)(10)
PRECHARGEꢀ(TruncateꢀWRITEꢀburst,ꢀstartꢀPRECHARGE)(8)
BURSTꢀTERMINATE(9)ꢀ
Hꢀ
Hꢀ
Lꢀ
H
L
Lꢀ
ꢀ
Hꢀ
Lꢀ
L
Readꢀ
Hꢀ
Hꢀ
Lꢀ
H
L
(Autoꢀ
Lꢀ
Prechargeꢀ
Disabled)ꢀ
Writeꢀ
Hꢀ
Hꢀ
Lꢀ
L
Hꢀ
Hꢀ
Hꢀ
Lꢀ
L
H
L
(Autoꢀ
Lꢀ
Prechargeꢀ
Hꢀ
Hꢀ
L
Disabled)ꢀ
Hꢀ
L
NOTE:
ꢀ 1.ꢀThisꢀtableꢀappliesꢀwhenꢀCKEꢀn-1ꢀwasꢀHIGHꢀandꢀCKEꢀnꢀisꢀHIGHꢀ(seeꢀTruthꢀTableꢀ-ꢀCKE)ꢀandꢀafterꢀtx s r has been met (if the
previous state was SELFꢀREFRESH).
ꢀ 2.ꢀThisꢀtableꢀisꢀbank-specific,ꢀexceptꢀwhereꢀnoted;ꢀi.e.,ꢀtheꢀcurrentꢀstateꢀisꢀforꢀaꢀspecificꢀbankꢀandꢀtheꢀcommandsꢀshownꢀareꢀthoseꢀ
allowedꢀtoꢀbeꢀissuedꢀtoꢀthatꢀbankꢀwhenꢀinꢀthatꢀstate.ꢀExceptionsꢀareꢀcoveredꢀinꢀtheꢀnotesꢀbelow.
Integrated Silicon Solution, Inc. — www.issi.comꢀ
7
Rev. A
03/19/08
ISSI [ INTEGRATED SILICON SOLUTION, INC ]
