EDS2504ACTA/08ACTA/16ACTA, EDS2504APTA/08APTA/16APTA
Command Truth Table for CKE
CKE
Current State
Self refresh
n – 1 n
/CS /RAS /CAS /WE Address
Operation
Notes
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, CLK (n – 1) would exit self refresh
Self refresh recovery
Self refresh recovery
ILLEGAL
H
H
H
H
L
L
L
L
ILLEGAL
L
Continue 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, CLK (n – 1) would exit power down
EXIT power down
H
H
L
×
×
×
L
EXIT power down
L
Continue power down mode
Refer to operations in Function Truth Table
Refer to operations in Function Truth Table
Refer to operations in Function Truth Table
CBR (auto) Refresh
H
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
L
×
OPCODE Refer to operations in Function Truth Table
Begin power down next cycle
L
Refer to operations in Function Truth Table
Refer to operations in Function Truth Table
L
L
×
Self refresh
1
L
OPCODE Refer to operations in Function Truth Table
H
L
×
×
×
×
Exit power down next cycle
Power down
L
1
1
2
Row active
H
L
×
Refer to operations in Function Truth Table
Clock suspend
×
Any state other than
listed above
H
H
L
H
L
Refer to operations in Function Truth Table
Begin clock suspend next cycle
Exit clock suspend next cycle
Maintain clock suspend
×
×
×
H
L
L
Remark: H: VIH. L: VIL. ×: VIH or VIL
Notes: 1. Self refresh can be entered only from the all banks idle state. Power down can be entered only from all
banks idle. Clock suspend can be entered only from following states, row active, read, read with auto-
precharge, write and write with auto precharge.
2. Must be legal command as defined in Function Truth Table.
Data Sheet E0110E30 (Ver. 3.0)
21
ELPIDA [ ELPIDA MEMORY ]
