T0
CLK
tCK
CKE
tCKS tCKH
tCMS tCMH
COMMAND
PRECHARGE
T1
NOP
DQM 0-3
A0-A9, A11
A10
ALL BANKS
SINGLE BANK
tAS tAH
BA0, BA1
BANK(S)
DQ High-Z
tRP
Precharge all
active banks
AUTO REFRESH MODE
T2
((
))
tCH
((
))
((
))
Tn + 1
tCL
PRELIMINARY
256Mb: x32
SDRAM
To + 1
((
))
((
))
((
))
AUTO
REFRESH
((
))
NOP( ( NOP
))
((
))
((
))
((
))
((
))
((
))
((
))
((
))
((
))
((
))
tRFC
AUTO
REFRESH
((
))
NOP( ( NOP
))
((
))
((
))
((
))
((
))
((
))
((
))
ACTIVE
ROW
ROW
((
))
((
))
((
))
tRFC
DON’T CARE
BANK
UDNODNE’FTINCEADRE
09005aef80cd8e48
256MbSDRAMx32.p65 – Rev. B; Pub. 03/04
40
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©2003 Micron Technology, Inc.