W949D6DB Datasheet, PDF (32/60 Pages) Winbond – Standard Self Refresh Mode

W949D6DB / W949D2DB
8.5.7 Random Read Bursts
Full-speed random read accesses within a page or pages can be performed as shown in following figure.
CK
CK
Command
READ
READ
READ
READ
NOP
NOP
Address BA,Col n
DQS
BA,Col x
CL=2
BA,Col b
BA,Col g
DQ
DQS
DO n
CL=3
DO n' DO x
DO x' DO b DO b' DO g DO g'
DQ
DO n DO n' DO x DO x' DO b DO b'
1) DO n ,etc. = Data Out from column n, etc.
n', x', etc. = Data Out elements, according to the programmed burst order
2) BA, Col n = Bank A, Column n
3) Burst Length = 2, 4, 8 or 16 in cases shown (if burst of 4, 8 or 16 the burst is interrupted)
4) Reads are to active rows in any banks
= Don't Care
8.5.8 Read Burst Terminate
Data from any READ burst may be truncated with a BURST TERMINATE command, as shown in
following figure. The BURST TERMINATE latency is equal to the read (CAS) latency, i.e., the BURST
TERMINATE command should be issued X cycles after the READ command where X equals the desired
data-out element pairs.
CK
CK
Command
READ
BST
NOP
NOP
NOP
NOP
Address BA,Col n
DQS
CL=2
DQ
DQS
CL=3
DQ
1) DO n = Data Out from column n
2) BA, Col n = Bank A, Column n
3) Cases shown are bursts of 4, 8 or 16 terminated after 2 data elements.
4) Shown with nominal tAC, tDQSCK and tDQSQ
= Don't Care
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Publication Release Date: Oct. 08, 2014
Revision: A01-003