W989D6DB Datasheet, PDF (14/64 Pages) Winbond – Standard Self Refresh Mode

W989D6DB / W989D2DB
7.1.3 Functional Truth Table for CKE
Current
State
Self refresh
CKE
n-1 n
H
X
L
H
L
H
L
H
L
H
L
L
H
X
Power-Down L
H
L
L
H
X
Deep Power-
Down
L
H
L
L
H
H
H
L
H
L
H
L
All banks idle
H
L
H
L
H
L
L
X
H
H
H
L
H
L
Row Active
H
L
H
L
H
L
L
X
Any state
other than
H
H
listed above
CS RAS CAS W E ^Address
Action
Notes
XXXX
HXXX
L HHH
LHLX
L
L
X
X
XXXX
XXXX
HXXX
L HHH
XXXX
XXXX
XXXX
XXXX
XXXX
HXXX
L HHH
L HH L
L
L
L
H
LHLX
L
L
X
X
XXXX
XXXX
HXXX
L HHH
L
L
L
H
LHLX
L
L
X
X
XXXX
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
X
N/A
X
Exit Power Down → Idle after 1 clock cycle
X
X
Maintain Power-Down
X
N/A
X
Exit Deep Power-Down → Exit Sequence
X
Maintain Deep Power-Down
X
Refer to Function Truth Table
X
Enter Power-down
2
X
Enter Power-Down
2
X
Enter Deep Power-Down
3
X
Self Refresh
1
X
ILLEGAL
X
ILLEGAL
X
Power-Down
2
X
Refer to Function Truth Table
X
Enter Power down
2
X
Enter Power down
2
X
ILLEGAL
X
ILLEGAL
X
ILLEGAL
X
Power-Down → Row Active or Maintain PD
XXXX
X
Refer to Function Truth Table
Notes:
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
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Publication Release Date: Mar. 19, 2014
Revision: A01-001