W989D6DB Datasheet, PDF (20/64 Pages) Winbond – Standard Self Refresh Mode

W989D6DB / W989D2DB
8.3.4 WRITE with auto precharge interrupted by a READ (with or without auto precharge)
A READ to bank m will interrupt a WRITE on bank n when registered, with the data-out appearing CL later. The
precharge to bank n will begin after tWR is met, where tWR begins when the READ to bank m is registered. The
last valid WRITE to bank n will be data in registered one clock prior to the READ to bank m.
T0
T1
T2
T3
T4
T5
T6
T7
CLK
Command
NOP
WRITE-AP
Bank n
NOP
READ-AP
Bank m
NOP
NOP
NOP
Internal
states
Bank n
Bank m
Page active
WRITE with burst of 4
Interrupt burst, write-back
tWR-bank n
precharge
tRP-bank n
Page active
READ with burst of 4
NOP
tRP-bank m
Address
DQ
Bank n,
Col a
Din
Din
a
a+1
Note: DQM is LOW.
Bank m,
Col d
CL=3 (bank m)
Dout
d
Dout
d+1
Don’t Care
8.3.5 WRITE with auto precharge interrupted by a WRITE (with or without auto precharge)
A READ to bank m will interrupt a WRITE on bank n when registered, with the data-out appearing CL later. The
precharge to bank n will begin after tWR is met, where tWR begins when the READ to bank m is registered. The
last valid WRITE to bank n will be data in registered one clock prior to the READ to bank m.
T0
T1
T2
T3
T4
T5
T6
T7
CLK
Command
NOP
WRITE-AP
Bank n
NOP
NOP
WRITE-AP
Bank m
NOP
NOP
NOP
Internal
states
Bank n
Page active
WRITE with burst of 4
Bank m
Page active
Interrupt burst, write-back
tWR-bank n
WRITE with burst of 4
precharge
tRP-bank n
tWR-bank m
Write-back
Address
DQ
Bank n,
Col a
Bank m,
Col d
Din
Din
Din
a
a+1
a+2
Din
Din
d
d+1
Note: DQM is LOW.
Din
Din
d+2
d+3
Don’t Care
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Publication Release Date: Mar. 19, 2014
Revision: A01-001