W9412G6JH
8.3 Function Truth Table for CKE
CKE
CURRENT
STATE
ADDRESS
ACTION
NOTES
CS RAS CAS
WE
n-1
n
H
L
X
H
H
H
H
L
X
H
L
X
X
H
H
L
X
X
H
L
X
X
X
X
X
X
X
X
X
X
X
X
H
X
X
X
X
X
X
H
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
X
INVALID
Exit Self Refresh->Idle after tXSNR
Exit Self Refresh->Idle after tXSNR
ILLEGAL
L
Self Refresh
L
L
L
L
X
X
X
X
X
X
X
H
L
ILLEGAL
L
X
X
X
X
X
H
L
X
X
X
X
X
X
H
L
Maintain Self Refresh
INVALID
H
L
X
H
L
Power Down
All banks Idle
Exit Power down->Idle after tIS
Maintain power down mode
Refer to Function Truth Table
Enter Power down
Enter Power down
Self Refresh
L
H
H
H
H
H
H
L
H
L
2
2
1
L
L
L
L
L
H
L
L
ILLEGAL
L
L
X
X
X
X
H
L
ILLEGAL
X
H
L
X
X
H
L
X
X
X
H
L
Power down
H
H
H
H
H
H
L
Refer to Function Truth Table
Enter Power down
Enter Power down
ILLEGAL
3
3
L
Row Active
L
L
L
L
H
L
L
ILLEGAL
L
L
X
X
ILLEGAL
X
X
X
Power down
Any State
Other Than
Listed Above
H
H
X
X
X
X
X
Refer to Function Truth Table
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: Nov. 29, 2011
Revision A03
- 21 -
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