Advantech SOM-ETX Design Guide
5.7.2.2 UDMA Support
Some SOM-ETX modules support UDMA 33 data transfer mode .If the advanced IDE
data transfer modes such as UDMA 66 is required . These modes require a special
80-conductor IDE cable for signal integrity.
For UDMA 66 support. It’s recommended the IDE bus and cable total length of
carried board will not exceed 13 inch.
SOM-ETX
IDE bus
IDE cable
Total Max.
Length 13 inch
Carried Board
Figure 5-23 IDE Bus Trace on Carrier Board and Cable Length Limitation
5.7.2.3 IDE interface connections
All necessary pull up/down resistors be implemented on SOM module and do not
need to implement on carried board.
SOM-ETX
PIDE_IOW#
PIDE_IOR#
PIDE_ACK#
PIDE_CS#1
PIDE_CS#3
PIDE_A[0..2]
PIDE_D[0..15]
PIDE_RDY
PIDE_INTRQ
PIDE_DRQ
HDRST#
23
25
29
37
38
31
27
21
1
Primary/
Secondary IDE
Connector
Figure 5-24 IDE0/IDE1 Connections
Chapter 5 Carrier Board Design Guidelines
87
Содержание SOM-4450 Series
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