IS42S81600D, IS42S16800D
CKE RELATED COMMAND TRUTH TABLE(1)
CKE
Current State
Self-Refresh(S.R.)
Operation
n-1
H
L
n
X
H
H
H
H
L
CS
X
H
L
RAS
X
X
H
H
L
CAS
X
X
H
L
WE Address
INVALID,CLK(n-1)wouldexitS.R.
Self-RefreshRecovery(2)
Self-RefreshRecovery(2)
Illegal
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
H
L
X
X
L
X
L
L
X
Illegal
L
L
X
X
X
H
L
X
MaintainS.R.
L
X
H
L
X
X
H
H
L
X
Self-RefreshRecovery Idle After tRC
H
H
H
H
H
H
H
H
L
H
H
H
H
L
X
Idle After tRC
Illegal
X
L
X
Illegal
L
X
X
H
L
X
Beginclocksuspendnextcycle(5)
H
L
X
H
H
L
X
Beginclocksuspendnextcycle(5)
L
X
Illegal
L
L
X
Illegal
L
L
X
X
X
X
X
X
X
X
H
L
X
Exitclocksuspendnextcycle(2)
H
L
X
X
X
X
X
H
L
X
X
X
X
X
X
H
L
X
Maintainclocksuspend
L
X
Power-Down(P.D.)
BothBanksIdle
INVALID,CLK(n-1)wouldexitP.D.
EXITP.D.-->Idle(2)
H
L
X
H
L
—
X
Maintainpowerdownmode
L
X
RefertooperationsinOperativeCommandTable
RefertooperationsinOperativeCommandTable
RefertooperationsinOperativeCommandTable
Auto-Refresh
H
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
L
—
—
L
—
L
L
X
RefertooperationsinOperativeCommandTable
RefertooperationsinOperativeCommandTable
RefertooperationsinOperativeCommandTable
RefertooperationsinOperativeCommandTable
Self-Refresh(3)
L
L
L
Op-Code
H
L
X
H
L
X
X
H
L
X
X
X
H
L
—
L
—
L
L
—
L
L
L
X
RefertooperationsinOperativeCommandTable
L
L
L
L
Op-Code
(3)
Power-Down
X
H
L
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Anystate
RefertooperationsinOperativeCommandTable
Beginclocksuspendnextcycle(4)
Exitclocksuspendnextcycle
H
H
L
otherthan
listedabove
H
L
Maintainclocksuspend
L
Notes:
1. H : High level, L : low level, X : High or low level (Don’t care).
2. CKE Low to High transition will re-enable CLK and other inputs asynchronously. A minimum
setup time must be satisfied
before any command other than EXIT.
3. Power down and Self refresh can be entered only from the both banks idle state.
4. Must be legal command as defined in Operative Command Table.
5. Illegal if tSRX is not satisfied.
Integrated Silicon Solution, Inc. — www.issi.com
13
Rev. E
07/28/08
ISSI [ INTEGRATED SILICON SOLUTION, INC ]
