Chapter 3
VME-MXI-2 Configuration and Installation
VME-MXI-2 User Manual
3-4
© National Instruments Corporation
a. Switch Set to A16 Base Address C040 Hex (Default)
b. Switch Set to A16 Base Address F000 Hex
OFF
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2
3
4
5
6
7
8
OFF
1
2
3
4
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6
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8
U20
U20
Figure 3-2. A16 Base Address Selection
VME-MXI-2 Intermodule Signaling
If you will be installing more than one VME-MXI-2 in a single
VMEbus chassis, you must select a user-defined pin for use by the
VME-MXI-2. The VME-MXI-2 modules use this signal to disable the
bus timeout unit(s) on the other VME-MXI-2 modules during VMEbus
accesses that map to the MXIbus. This is done because the MXIbus bus
timeout unit should be the sole timer of any MXIbus access. Since bus
timeout units on other VMEbus modules cannot monitor this signal,
they should be permanently disabled. If it is not possible to disable a
module’s bus timeout unit, it should be configured to the highest setting
to give MXIbus accesses as much time as possible to complete.
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