EDD2508AKTA-5B ELPIDA [Elpida Memory], EDD2508AKTA-5B Datasheet - Page 18

• Manufacturer Part Number: EDD2508AKTA-5B
• Description: 256M bits DDR SDRAM (32M words x 8 bits, DDR400)
• Manufacturer: ELPIDA [Elpida Memory]

Command Truth Table for CKE
Remark: H: VIH. L: VIL. : VIH or VIL
Note: Self refresh can be entered only from the all banks idle state. Power down can be entered only from all
Preliminary Data Sheet E0349E60 (Ver. 6.0)
Current State
Self refresh
Self refresh recovery
Power down
All banks idle
Row active
banks idle or row active state.
CKE
n – 1 n
H
L
L
L
L
L
H
H
H
H
H
H
H
H
H
L
L
L
H
H
H
H
H
H
H
H
H
H
L
H
L
H
H
H
H
L
H
H
H
H
L
L
L
L
H
H
L
H
H
H
H
H
L
L
L
L
L
/CS
H
L
L
L
H
L
L
L
H
L
L
L
H
L
H
L
L
L
L
H
L
L
L
L
/RAS /CAS /WE Address
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
OPCODE Refer to operations in Function Truth Table
OPCODE Refer to operations in Function Truth Table
18
Operation
INVALID, CK (n-1) would exit self refresh
Self refresh recovery
Self refresh recovery
ILLEGAL
ILLEGAL
Maintain self refresh
Idle after tRC
Idle after tRC
ILLEGAL
ILLEGAL
ILLEGAL
ILLEGAL
ILLEGAL
ILLEGAL
INVALID, CK (n – 1) would exit power down
EXIT power down
Maintain 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
Refer to operations in Function Truth Table
Refer to operations in Function Truth Table
Refer to operations in Function Truth Table
Self refresh
Power down
Refer to operations in Function Truth Table
Power down
Idle
EDD2508AKTA-5
Notes
1
1
1