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W9425G6EH
8.3
Function Truth Table for CKE
CURRENT
STATE
CKE
n-1
n
CS
RAS CAS
WE
ADDRESS
ACTION
NOTES
H
L
X
H
X
H
X
X
X
X
X
X
X
X
INVALID
Exit Self Refresh -> Idle after t XSNR
Self Refresh
Power Down
L
L
L
L
H
L
L
H
H
H
H
L
X
H
L
H
L
L
L
X
X
X
X
X
H
H
L
X
X
X
X
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
Exit Self Refresh -> Idle after t XSNR
ILLEGAL
ILLEGAL
Maintain Self Refresh
INVALID
Exit Power down -> Idle after t IS
Maintain power down mode
Refer to Function Truth Table
H
H
L
L
H
L
X
H
X
H
X
X
X
X
Enter Power down
Enter Power down
2
2
All banks Idle
Row Active
H
H
H
L
H
H
H
H
H
H
L
L
L
L
X
H
L
L
L
L
L
X
L
L
L
X
X
H
L
L
L
L
X
L
H
L
X
X
X
H
L
H
L
X
L
L
X
X
X
X
H
L
L
X
X
H
X
X
X
X
X
X
H
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Self Refresh
ILLEGAL
ILLEGAL
Power down
Refer to Function Truth Table
Enter Power down
Enter Power down
ILLEGAL
ILLEGAL
ILLEGAL
Power down
1
3
3
Any State
Other Than
H
H
X
X
X
X
X
Refer to Function Truth Table
Listed Above
Notes :
1. Self refresh can enter only from the all banks idle state.
2. Power Down occurs when all banks are idle; this mode is referred to as precharge power down.
3. Power Down occurs when there is a row active in any bank; this mode is referred to as active power down.
Remark:
H = High level, L = Low level, X = High or Low level (Don’t care), V = Valid data
Publication Release Date:Dec. 03, 2008
- 22 -
Revision A08
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