W988D6FB_13 Datasheet, PDF (20/66 Pages) Winbond – 256Mb Mobile LPSDR

W988D6FB / W988D2FB
8.1.3 Function Truth Table for CKE
256Mb Mobile LPSDR
Current State
CKE
CS RAS CAS WE Address
n-1
n
Action
Notes
Self refresh
H
X
X
X
L
H
H
X
L
H
L
H
L
H
L
H
L
H
L
L
L
L
X
X
X
X
X
X
H
H
L
X
X
X
X
X
X
N/A
X
Exit Self Refresh → Idle after tRFC
X
Exit Self Refresh → Idle after tRFC
X
ILLEGAL
X
ILLEGAL
X
Maintain Self Refresh
Power-Down
H
X
X
X
H
X
L
H
L
H
L
L
X
X
X
X
X
X
H
H
X
X
X
N/A
X
Exit Power Down → Idle after 1 clock cycle
X
X
Maintain Power-Down
Deep Power-Down
H
X
X
X
L
H
X
X
L
L
X
X
X
X
X
X
X
X
X
N/A
X
Exit Deep Power-Down → Exit Sequence
X
Maintain Deep Power-Down
H
H
X
X
X
X
X
Refer to Function Truth Table
H
L
H
X
X
X
X
Enter Power-down
2
H
L
L
H
H
H
X
Enter Power-Down
2
H
L
L
H
H
L
X
Enter Deep Power-Down
3
All banks idle
H
L
L
L
L
H
X
Self Refresh
1
H
L
L
H
L
X
X
ILLEGAL
H
L
L
L
X
X
X
ILLEGAL
L
X
X
X
X
X
X
Power-Down
2
Row Active
H
H
X
X
X
X
X
Refer to Function Truth Table
H
L
H
X
X
X
X
Enter Power down
2
H
L
L
H
H
H
X
Enter Power down
2
H
L
L
L
L
H
X
ILLEGAL
H
L
L
H
L
X
X
ILLEGAL
H
L
L
L
X
X
X
ILLEGAL
L
X
X
X
X
X
X
Power-Down → Row Active or Maintain PD
Any state other than
listed above
H
H
X
X
X
X
X
Refer to Function Truth Table
Note:
1. Self refresh can enter only from the all banks idle state.
2. Power-down can enter only from the all banks idle or row active state.
3. Deep power-down can enter only from the all banks idle state.
Remark: H = High level, L = Low level, X = High or Low level (Don’t care), V = Valid data
- 20 -
Publication Release Date : August 15, 2013
Revision A01-004