W988D6FB_13 Datasheet, PDF (58/66 Pages) Winbond – 256Mb Mobile LPSDR

W988D6FB / W988D2FB
11.18 Auto Precharge Timing (Write Cycle)
256Mb Mobile LPSDR
012345
(1) burst length = 1 Write
PRE
tWR
Command
Write / A
AP
Act
tWR’
tRP
DQ _D0
(2) burst length = 2
PRE
Write
tWR
Command
Write / A
AP
tWR’
tRP
DQ _{D0 D1}
(3) burst length = 4
Command
Write
Write / A
PRE
tWR
AP
tWR’
DQ
D0 D1 D2
D3
(4) burst length = 8
Command
Write
Write / A
DQ D0 D1 D2 D3 D4 D5
67
Act
tRP
D6 D7
8 9 10 11 12
Act
PRE
tWR
AP
tWR’
Act
tRP
Note: 1. Write represents the write command.
Write / A represents the Write with Auto precharge command.
AP ^{represents the start of internal precharging.}
PRE ^{represents the Precharge command.}
Act represents the Bank Activate command.
2. When the Auto precharge command is asserted, the period from Bank Activate command to the start of internal precgarging must be at
least tRAS (min).“Dn” = Write data, and “Qn” = Read data
3. For WRITE without auto-precharge, tWR= 15ns.
4. For WRITE with auto-precharge, tWR=2tCK.
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Publication Release Date : August 15, 2013
Revision A01-004