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Note:
In a PC/104
-Plus
or PCI-104 system, all PCI devices should be located on one side of
the CPU board (above or below the add-on cards). The CPU should not be located
between two PCI devices.
Switch U12 – PCI Slot Selector
If the CM17407 has a set of DIP switches, the PCI Slot Number can be configured as follows:
Switch 1
Switch 2 PCI Slot Number
Off
Off
Slot 0 (closest to CPU)
Off
On
Slot 1
On
Off
Slot 2
On
On
Slot 3
If the CM17407 has a rotary switch, the PCI Slot Number can be configured as follows:
Switch
Position
PCI Slot Number
0
Slot 0 (closest to CPU)
1
Slot 1
2
Slot 2
3
Slot 3
4
Undefined
5
Undefined
6
Undefined
7
Undefined
Solder Blob B1 – Bus Master Control
When the PC/104
-Plus
Specification was first introduced, it only allowed for three PCI add-on
cards to be bus masters. Version 2.0 of the PC/104
-Plus
specification was released in November
2003. This version of the specification (which the CM17407 is designed for) adds support for all 4
PCI slots to be bus masters.
For compatibility with CPUs designed for the older PC/104
-Plus
Specification, the CM17407
offers a configuration solder blob at location B1. If this solder blob is open (the default), the board
supports bus mastering in all 4 PCI slots. If it is closed, the board will work in a 3 bus master
configuration.
Note:
The CM17407 comes with solder blob B1 open by default. This should be compatible
with most PC/104
-Plus
CPUs. There is no need to change this blob unless you are
having compatibility problems with your specific CPU.
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