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RMLD232UAW датащи(PDF) 19 Page - Emerging Memory & Logic Solutions Inc

номер детали RMLD232UAW
подробное описание детали  2M x 32 bit Low Power DDR SDRAM
PDF  50 Pages
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производитель  EMLSI [Emerging Memory & Logic Solutions Inc]
домашняя страница  http://www.emlsi.com
Logo EMLSI - Emerging Memory & Logic Solutions Inc

RMLD232UAW датащи(HTML) 19 Page - Emerging Memory & Logic Solutions Inc

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19
Rev 0.7
64Mb Low Power DDR SDRAM
Advanced
DM masking
The DDR SDRAM has a data mask function that can be used in conjunction with data write cycle, not read cycle. When the data
mask is activated (DM high) during write operation, DDR SDRAM does not accept the corresponding data.(DM to data-mask latency
is zero).
DM must be issued at the rising or falling edge of data strobe.
0
1
2
3
4
5
6
7
8
CK
CK
Command
NOP
NOP
NOP
NOP
DQS
DQs
Figure.13 DM masking timing
< Burst Length=8 >
NOP
WRITE
NOP
NOP
NOP
Din 0 Din 1
Din 3
Din 2
Din 5
Din 4
Din 6 Din 7
tDQSSmax
tWPRES tWPREH
masked by DM=H
DM



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