W949D6CB Datasheet, PDF (31/60 Pages) Winbond – 512Mb Mobile LPDDR

W949D6CB / W949D2CB
512Mb Mobile LPDDR
7.5.7 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^I
DO x
DO x^I DO b DO b^I
DO g DO g^I
DQ
DO n DO n^I DO x DO x^I DO b DO b^I
1) DO n ,etc. = Data Out from column n, etc.
n^I, x^I, 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
7.5.8 Read Burst Terminate
Data from any READ burst may be truncated with a BURST TERMINATE command, as shown in 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: Sep, 21, 2011
Revision A01-007