W989D6CB Datasheet, PDF (23/67 Pages) Winbond – 512Mb Mobile LPSDR

W989D6CB / W989D2CB
512Mb Mobile LPSDR
8.3.3 READ with auto precharge interrupted by a WRITE (with or without auto precharge)
A WRITE to bank m will interrupt a READ on bank n when registered. DQM should be used two clocks prior to the WRITE
command to prevent bus contention. The precharge to bank n begins when the WRITE to bank m is registered.
T0
T1
T2
T3
T4
T5
T6
T7
CLK
Command
READ-AP
Bank n
NOP
NOP
Internal
states
Bank n ^Page
active
Bank m
READ with burst of 4
Page active
NOP
WRITE-AP
Bank m
NOP
NOP
Interrupt burst, precharge
tRP-bank n
WRITE with burst of 4
NOP
Idle
tWR-bank m
Write-back
Address
DQM ¹
DQ
Bank n,
Col a
CL=3 (bank n)
Bank m,
Col d
DOUT
Din
a
d
Din
Din
d+1
d+2
Note: 1. DQM is HIGH at T2 to prevent D_OUTa + 1 from contending with D_INd at T4.
Din
d+3
Don’t Care
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Publication Release Date: Sep, 22, 2011
Revision A01-005