Layout Guideline - Advantech SOM-ETX Series Design Manual

5.4.2.2 ISA vs. Other Buses
Personal computer manufacturers are eliminating the ISA bus from new products.
Although this action will not have an immediate impact on embedded applications,
there is a clear trend to migrate ISA bus functions to the PCI bus or to other
interfaces such as USB.
These newer interfaces are more efficient than the ISA bus and easier for operating
systems to manage. They also have fewer resource limitations. Designers should
consider PCI and USB as alternatives to new ISA bus implementations, or as an
eventual upgrade path from ISA designs.

5.4.3 Layout Guideline

5.4.3.1 ISA BUS necessary Pull up resistors location
All necessary pull up resistors were implemented in SOM-ETX. CSB do not need to
consider terminate resistors design.
SOM-ETX
On Board Chipset
Figure 5-14 ISA BUS necessary Pull up resistors location
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Advantech SOM-ETX Design Guide
SOM-ETX
VCC
Necessary
Pull-Up
Resistor
SOM-
Connector
ISA BUS
Chapter 5 Carrier Board Design Guidelines
ETX
Board ISA
Connector
ISA BUS
X2
Base