IS43R16320B
IC43R16320B
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.
Integrated Silicon Solution, Inc. — www.issi.com
19
Rev. 00B
06/11/08
ISSI [ INTEGRATED SILICON SOLUTION, INC ]
