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W989D6DB Datasheet, PDF (13/64 Pages) Winbond – Standard Self Refresh Mode
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W989D6DB / W989D2DB
Current
State
CS RAS CAS W E
Address
Command
Action
Notes
H
X
X
X
X
DSL
Nop → Maintain Row active after tWR
L
H
H
H
X
L
H
H
L
X
NOP
BST
Nop → Maintain Row active after tWR
Nop → Maintain Row active after tWR
L
H
L
H BA, CA, A10 READ/READA Begin Read
7
Write
recovering
L
H
L
L BA, CA, A10 WRIT/WRITA Begin new Write
L
L
H
H
BA, RA
ACT
ILLEGAL
3
L
L
H
L
BA, A10
PRE/PREA ILLEGAL
3
L
L
L
H
X
AREF/SELF ILLEGAL
L
L
L
L
Op-Code
MRS/EMRS ILLEGAL
H
X
X
X
X
L
H
H
H
X
DSL
NOP
Nop → Enter precharge after tWR
Nop → Enter precharge after tWR
L
H
H
L
X
BST
Nop → Enter precharge after tWR
Write
L
H
L
H BA, CA, A10 READ/READA ILLEGAL
3
recovering
with auto
L
H
L
L BA, CA, A10 WRIT/WRITA ILLEGAL
3
precharge L
L
H
H
BA, RA
ACT
ILLEGAL
3
L
L
H
L
BA, A10
PRE/PREA ILLEGAL
3
L
L
L
H
X
AREF/SELF ILLEGAL
L
L
L
L
Op-Code
MRS/EMRS ILLEGAL
H
X
X
X
X
DSL
Nop → Idle after tRFC
L
H
H
H
X
NOP
Nop → Idle after tRFC
L
H
H
L
X
BST
Nop → Idle after tRFC
Refreshing L
H
L
X
X
READ/WRIT ILLEGAL
L
L
H
X
X
ACT/PRE/PREA ILLEGAL
L
L
L
X
X
AREF/SELF/
MRS/EMRS
ILLEGAL
H
X
X
X
X
DSL
Nop → Idle after tMRD
L
H
H
H
X
NOP
Nop → Idle after tMRD
Mode
L
H
H
L
register
accessing L
H
L
X
L
L
X
X
X
BST
ILLEGAL
X
READ/WRIT ILLEGAL
ACT/PRE/PREA/
X
AREF/SELF/ ILLEGAL
MRS/ EMRS
Notes:
1. All entries assume that CKE was active (High level) during the preceding clock cycle and the current clock cycle. (CKEn-1 =
CKEn = ”1”)
2. Illegal if any bank is not idle.
3. Illegal to bank in specified states; Function may be legal in the bank indicated by Bank Address (BA), depending on the
state of that bank.
4. Illegal if tRCD is not satisfied.
5. Illegal if tRAS is not satisfied.
6. Must satisfy burst interrupt condition.
7. Must avoid bus contention, bus turn around, and/or satisfy write recovery requirements.
8. Must mask preceding data which don’t satisfy tWR.
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
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