W989D6DB Datasheet, PDF (57/64 Pages) Winbond – Standard Self Refresh Mode

W989D6DB / W989D2DB
11.18 Auto-precharge Timing (Write Cycle)
(1) burst length = 1
Command
0
Write
Write/A
DQ
(2) burst length = 2
Command
D0
Write
Write/A
DQ
(3) burst length = 4
Command
DQ
(4) burst length = 8
Command
DQ
D0
Write
Write/A
D0
Write
Write/A
D0
1
tWR
tWR’
D1
D1
D1
2
PRE
AP
tWR
tWR’
D2
D2
3
4
5
tRP
PRE
AP
Act
tRP
tWR
tWR’
PRE
AP
D3
D3
D4
D5
6
7
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).
3. For WRITE without auto-precharge, tWR = 15nS.
4. For WRITE with auto-precharge, tWR = 2tCK.
- 57 -
Publication Release Date: Mar. 19, 2014
Revision: A01-001