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128Mb: x16 Mobile SDRAM
Operation
In the case of a fixed-length burst being executed to completion, a PRECHARGE
command issued at the optimum time (as described above) provides the same opera-
tion that would result from the same fixed-length burst with auto precharge. The disad-
vantage of the PRECHARGE command is that it requires that the command and address
buses be available at the appropriate time to issue the command; the advantage of the
PRECHARGE command is that it can be used to truncate fixed-length bursts.
Figure 12:
READ-to-WRITE
T0
T1
T2
T3
T4
C LK
DQM
C OMMAND
READ
NOP
NOP
NOP
WRITE
ADDRE SS
BANK,
C OL n
t C K
tHZ
BANK,
C OL b
DQ
TRAN S ITIONIN G DATA
D OUT n
D IN b
t D S
DON ’ T C ARE
Notes:
1. CL = 3 is used for illustration; the READ command may be to any bank, and the WRITE com-
mand may be to any bank. If a burst of one is used, then DQM is not required.
Figure 13:
READ-to-WRITE with Extra Clock Cycle
T0
T1
T2
T3
T4
T5
CLK
DQM
COMMAND
READ
NOP
NOP
NOP
NOP
WRITE
ADDRESS
BANK,
COL n
tHZ
BANK,
COL b
DQ
D OUT n
TRANSITIONING DATA
D IN b
t DS
DON’T CARE
Notes:
1. CL = 3 is used for illustration; the READ command may be to any bank, and the WRITE com-
mand may be to any bank.
PDF: 09005aef8237e877/Source: 09005aef8237e8d8
128Mb_x16 Mobile SDRAM_Y25M_2.fm - Rev. C 2/07 EN
22
Micron Technology, Inc., reserves the right to change products or specifications without notice.
?2006 Micron Technology, Inc. All rights reserved.
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