EM48AMM1684VTG
5. Command Truth Table for CKE
Current
state
CKE
/CS /R /C /W Addr.
Action
Notes
n-1
n
X
H
H
H
H
L
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
X
X
X
X
X
X
X
X
H
L
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
INVALID, CLK (n – 1) would exit self refresh
Self refresh recovery
L
Self refresh recovery
Self refresh
L
L
ILLEGAL
L
L
X
X
X
H
L
ILLEGAL
L
X
H
L
X
X
H
H
L
Maintain self refresh
H
H
H
H
H
H
H
H
H
L
H
H
H
H
L
Idle after tRC
Idle after tRC
L
ILLEGAL
Self refresh
recovery
L
X
X
H
L
ILLEGAL
H
L
X
H
H
L
ILLEGAL
L
ILLEGAL
L
L
ILLEGAL
L
L
X
X
X
X
X
X
H
L
ILLEGAL
X
H
L
X
X
X
H
L
X
X
X
X
H
L
INVALID, CLK(n-1) would exit power down
Exit power down→ Idle
Power
down
L
Maintain power down mode
Refer to operations in Operative Command Table
Refer to operations in Operative Command Table
Refer to operations in Operative Command Table
Refresh
H
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
L
L
L
L
X
L
L
L
Op-Code Refer to operations in Operative Command Table
Refer to operations in Operative Command Table
Refer to operations in Operative Command Table
Refer to operations in Operative Command Table
Both banks
idle
H
L
X
H
L
X
X
H
L
X
X
X
H
L
L
L
L
L
L
L
X
Self refresh
17
17
17
18
L
L
L
L
Op-Code Refer to operations in Operative Command Table
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
X
X
X
X
X
X
X
X
X
Power down
H
L
Refer to operations in Operative Command Table
Power down
Row active
H
H
L
Refer to operations in Operative Command Table
Begin clock suspend next cycle
Exit clock suspend next cycle
Maintain clock suspend
Any state
other than
listed above
X
X
X
H
L
L
H = High level, L = Low level, X = High or Low level (Don't care)
Note 17: Self refresh can be entered only from the both banks idle state.
Power down can be entered only from both banks idle or row active state.
Note 18: Must be legal command as defined in Operative Command Table
Jun. 2010
19/20
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