EM44DM1688LBB
4. Command Truth Table for CKE
Current State
C
H
L
KE /CS /R /C /W Addr.
Action
X
H
X
H
X
X
X
X
X
X
X
X
INVALID
Exist Self-Refresh
L
L
L
H
H
H
L
L
L
H
H
H
H
H
L
H
L
X
X
X
Exist Self-Refresh
ILLEGAL
Self Refresh
X
ILLEGAL
L
L
H
L
H
L
L
L
X
X
X
X
X
X
X
X
X
X
X
X
ILLEGAL
X
X
H
X
X
X
NOP(Maintain self refresh)
INVALID
X
H
Exist Power down
Both bank
precharge
power down
L
L
L
H
H
H
L
L
L
H
H
H
H
H
L
H
L
X
X
X
X
Exist Power down
ILLEGAL
ILLEGAL
L
H
L
H
L
L
L
L
L
X
X
X
X
H
H
X
X
X
X
H
L
X
X
X
X
X
X
ILLEGAL
L
X
X
H
L
X
X
X
H
H
NOP(Maintain Power down)
Refer to function true table
Enter power down mode(Note 3)
Enter power down mode(Note 3)
ILLEGAL
H
H
H
H
L
All Banks Idle
H
H
L
L
L
L
H
L
L
H
X
H
X
RA
ILLEGAL
Row active/Bank active
H
H
H
L
L
L
L
X
L
L
L
X
L
L
L
X
L
L
L
X
H
L
X
Enter self-refresh(Note 3)
Op-Code Mode register access
L
Op-Code Special mode register access
X
X
X
Refer to current state
Any state other than
listed above
H
H
X
X
X
X
Refer to command truth table
H = High level, L = Low level, X = High or Low level (Don't care)
Notes 1: After CKE’s low to high transition to exist self refresh mode.And a time of tRC(min) has to be Elapse after
CKE’s low to high transition to issue a new command.
Notes 2: CKE low to high transition is asynchronous as if restarts internal clock.
Notes 3: Power down and self refresh can be entered only from the idle state of all banks.
5. Bank Selection Signal Table
Bank\Signal
Bank0
BA0
L
BA1
L
BA2
L
Bank1
Bank2
Bank3
Bank4
Bank5
Bank6
Bank7
H
L
H
L
H
L
H
L
L
L
L
H
H
H
H
H
H
L
L
H
H
Note: H:VIH, L:VIL
Nov. 2011
20/29
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