FEDS82V16520A-01
OKI Semiconductor
MS82V16520A
Function Truth Table for CKE
Current State (n) CKEn-1 CKEn CS RAS CAS WE Address
Action
Note
Self Refresh
(SREF)
H
L
×
H
H
H
H
H
L
×
H
L
L
L
L
×
×
H
L
L
L
L
×
×
H
L
L
L
L
L
L
×
×
×
×
×
×
×
×
×
H
H
L
×
×
×
×
H
H
L
×
×
×
×
H
H
L
H
L
L
×
×
×
×
×
×
×
H
L
×
×
×
×
×
H
L
×
×
×
×
×
H
L
×
L
H
L
×
×
×
×
×
×
×
×
×
×
×
×
×
×
×
×
×
×
×
×
×
×
×
×
×
×
×
×
×
×
×
×
INVALID
Exit Self Refresh → ABI
Exit Self Refresh → ABI
ILLEGAL
L
H
H
H
L
×
L
L
ILLEGAL
L
ILLEGAL
L
NOP (Maintain Self Refresh)
INVALID
Power Down
(PD)
H
L
×
×
H
H
H
H
H
L
×
Exit Self Refresh → ABI
Exit Self Refresh → ABI
ILLEGAL
L
H
H
H
L
×
L
L
ILLEGAL
L
ILLEGAL
L
NOP (Continue power down mode)
Refer to Truth Table
Enter Power Down
Enter Power Down
ILLEGAL
All Banks Idle
(ABI)
H
H
H
H
H
H
H
H
L
H
L
×
6
6
6
6
6
6
6
6
6
×
L
H
H
H
L
L
L
×
L
L
ILLEGAL
L
ILLEGAL
L
Enter Self Refresh
ILLEGAL
L
L
NOP
Any State Other
than Listed Above
H
H
L
H
L
×
Refer to Truth Table
Begin Clock Suspend Next Cycle
Enable Clock of Next Cycle
Continue Clock Suspension
×
H
L
×
L
×
Note: 6. Power-down and self refresh can be entered only when all the banks are in an idle state.
10/40
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