Vxibus Local Bus - National Instruments MXI Series Getting Started

VXIbus Local Bus

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As required by the VXIbus specification, the VXI-MXI-2 drives the
10 MHz signal CLK10 on a differential ECL output when installed in
Slot 0. When not installed in Slot 0, the VXI-MXI-2 only receives the
CLK10 signal.
If you will be installing more than one VXI-MXI-2 in a single VXIbus
mainframe, you must configure the boards to use the local bus. The
VXI-MXI-2 uses the local bus to pass a signal to the other VXI-MXI-2
modules in the mainframe to disable the VMEbus bus timeout unit (BTO)
during cycles that map to the MXIbus. Because the local bus is used,
you need to install all VXI-MXI-2 modules for a single mainframe in
adjacent slots.
You will use two switches on the VXI-MXI-2 to select its position in
relation to any other VXI-MXI-2 module in the mainframe. Use switch S9
when there is a VXI-MXI-2 to the right (higher numbered slot). Use S8
when there is a VXI-MXI-2 to the left (lower numbered slot).
Figure 3-4 shows four configuration settings for a VXI-MXI-2. Figure 3-4a
illustrates the default setting, which is for a single VXI-MXI-2 in a
mainframe. Use the setting in Figure 3-4b for the VXI-MXI-2 located to
the left of all others. Figure 3-4c shows the setting to use if the VXI-MXI-2
is between two others. Use the setting of Figure 3-4d for the VXI-MXI-2
located to the right of all others.
Chapter 3 VXI-MXI-2 Configuration and Installation
3-7 PCI-MXI-2 for Linux