W949D6DB Datasheet, PDF (33/60 Pages) Winbond – Standard Self Refresh Mode

W949D6DB / W949D2DB
8.5.9 Read to Write
Data from READ burst must be completed or truncated before a subsequent WRITE command can be
issued. If truncation is necessary, the BURST TERMINATE command must be used, as shown in
following figure for the case of nominal tDQSS.
CK
CK
Command
Address
READ
BA,Col n
DQS
DQ
BST
CL=2
NOP
DO n
WRITE
BA,Col b
t_DQSS
NOP
NOP
DM
Command
READ
BST
Address BA,Col n
NOP
NOP
WRITE
BA,Col b
NOP
DQS
DQ
CL=3
DO n
DM
= Don't Care
1) DO n = Data Out from column n; DI b= Data In to column b
2) Burst length = 4, 8 or 16 in the cases shown; If the burst length is 2, the BST command can be omitted
3) Shown with nominal tAC, tDQSCK and tDQSQ
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Publication Release Date: Oct. 08, 2014
Revision: A01-003