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128Mbx16x32Mobile_2.fm - Rev. M 1/09 EN
43
2001 Micron Technology, Inc. All rights reserved.
128Mb: x16, x32 Mobile SDRAM
READs
Interrupted by a WRITE (with or without auto precharge): A WRITE to bank m will
interrupt a WRITE on bank n when registered. The precharge to bank n will begin
after tWR is met, where tWR begins when the WRITE to bank m is registered. The last
valid data WRITE to bank n will be data registered 1 clock prior to a WRITE to bank m
Figure 33:
WRITE With Auto Precharge Interrupted by a READ
Notes:
1. DQM is LOW.
Figure 34:
WRITE With Auto Precharge Interrupted by a WRITE
Notes:
1. DQM is LOW.
DON’T CARE
CLK
DQ
T2
T1
T4
T3
T6
T5
T0
COMMAND
WRITE - AP
BANK n
NOP
DIN
a + 1
DIN
a
NOP
T7
BANK n
BANK m
ADDRESS
BANK n,
COL a
BANK m,
COL d
READ - AP
BANK m
Internal
States
t
Page Active
WRITE with Burst of 4
Interrupt Burst, Write-Back
Precharge
Page Active
READ with Burst of 4
t
tRP - BANK m
DOUT
d
DOUT
d + 1
CL = 3 (BANK m)
RP - BANK n
WR - BANK n
TRANSITIONING DATA
DON’T CARE
CLK
DQ
T2
T1
T4
T3
T6
T5
T0
COMMAND
WRITE - AP
BANK n
NOP
DIN
d + 1
DIN
d
DIN
a + 1
DIN
a + 2
DIN
a
DIN
d + 2
DIN
d + 3
NOP
T7
BANK n
BANK m
ADDRESS
NOP
BANK n,
COL a
BANK m,
COL d
WRITE - AP
BANK m
Internal
States
t
Page Active
WRITE with Burst of 4
Interrupt Burst, Write-Back
Precharge
Page Active
WRITE with Burst of 4
Write-Back
WR - BANK n
tRP - BANK n
t WR - BANK m
TRANSITIONING DATA