EDD1204ALTA, EDD1208ALTA, EDD1216ALTA
4.5 Command Truth Table for CKE
Current State
CKE
n-1
/CS /RAS /CAS /WE Add Command
Action
Notes
2
n
x
Self refresh
H
L
x
H
L
x
x
x
x
x
x
x
x
x
x
H
x
x
x
x
x
x
V
x
H
L
x
x
H
x
x
x
V
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
V
x
x
ILLEGAL(Impossible)
H
SREX
Exit S.R, self refresh recovery
H
x
H
x
L
H
H
H
L
L
H
H
L
Maintain self refresh
Nop (Idle after tRC)
Nop (Idle after tRC)
ILLEGAL
Self refresh recovery
Power down
H
L
x
x
x
DESL
NOP
H
x
H
x
x
x
x
x
ILLEGAL (Impossible)
ILLEGAL (Impossible)
Exit power down, Idle
H
L
x
x
x
x
H
H
L
x
x
x
PDEX
H
x
H
x
L
H
H
H
H
H
H
H
L
L
H
L
L
L
L
L
L
x
Maintain power down
All banks idle
V
H
L
L
L
L
L
x
V
x
V
x
Refer to operative command table
PWDN Power down entry
PWDN Power down entry
ILLEGAL
1
1
H
x
H
x
H
L
L
x
L
H
L
x
ILLEGAL
ILLEGAL
SELF
Self refresh entry
1
1
Power down
Row active
H
L
x
x
x
x
Refer to operative command table
Power down
x
x
x
x
Any state except
listed above
H
H
L
H
L
x
V
x
V
x
V
x
Refer to operative command table
ILLEGAL
x
x
x
ILLEGAL (Impossible)
Remark H = High level, L = Low level, x = High or Low level (Don't care), V = Valid,
Add = Address (A0 - A11, BA0, BA1),
ILLEGAL = Device operation and/or data-integrity are not guaranteed
Notes 1. Self refresh can be entered only from all banks idle state.
Power down can be entered only from all banks idle or row active state.
2. CKE low to high transition will re-enable CLK and other inputs asynchronously.
A Minimum setup time must be satisfied before any command other than exit.
20
Preliminary Data Sheet E0136E30
ELPIDA [ ELPIDA MEMORY ]
