EDD2516ARTA-6B
Command Truth Table for CKE
Current State
CKE
n – 1 n
/CS /RAS /CAS /WE Address
Operation
Notes
Self refresh
H
L
×
×
H
L
L
L
×
H
L
L
L
H
L
L
L
×
H
L
×
H
L
L
L
L
H
L
L
L
L
×
×
×
×
×
H
H
L
×
×
H
H
L
×
H
H
L
×
×
H
×
×
H
L
L
L
×
H
L
L
L
×
×
×
×
×
H
L
×
×
×
H
L
×
×
H
L
×
×
×
H
×
×
×
H
L
L
×
×
H
L
L
×
×
×
×
×
×
×
×
×
×
×
×
×
×
×
×
×
×
×
H
×
×
×
×
H
L
×
×
×
H
L
×
×
×
×
×
×
×
×
×
×
×
×
×
×
×
×
×
INVALID, CK (n-1) would exit self refresh
Self refresh recovery
Self refresh recovery
ILLEGAL
H
H
H
H
L
L
L
L
ILLEGAL
L
Maintain self refresh
Idle after tRC
Self refresh recovery
H
H
H
H
H
H
H
H
H
L
H
H
H
H
L
Idle after tRC
ILLEGAL
ILLEGAL
ILLEGAL
L
ILLEGAL
L
ILLEGAL
L
ILLEGAL
Power down
All banks idle
×
INVALID, CK (n – 1) would exit power down
EXIT power down → Idle
H
H
L
×
×
×
L
L
Maintain power down mode
H
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
L
Refer to operations in Function Truth Table
Refer to operations in Function Truth Table
Refer to operations in Function Truth Table
CBR (auto) refresh
×
OPCODE Refer to operations in Function Truth Table
Refer to operations in Function Truth Table
Refer to operations in Function Truth Table
Refer to operations in Function Truth Table
L
L
L
×
Self refresh
1
1
1
L
OPCODE Refer to operations in Function Truth Table
×
×
×
×
Power down
Row active
H
L
×
Refer to operations in Function Truth Table
Power down
×
Remark: H: VIH. L: VIL. ×: VIH or VIL
Note: 1. Self refresh can be entered only from the all banks idle state. Power down can be entered only from all
banks idle or row active state.
Data Sheet E0848E10 (Ver. 1.0)
19
ELPIDA [ ELPIDA MEMORY ]
