User manual

Differences and

Incompatibilities

between the VXI-MXI

and the VXI-MXI-2

Appendix

This appendix describes the differences and incompatibilities between

the first-generation MXIbus-to-VXIbus interface, the VXI-MXI, and

the VXI-MXI-2. This information may be helpful for users of the

VXI-MXI who are moving to the VXI-MXI-2.

MXIbus Connector

The VXI-MXI-2 interfaces the VXIbus to the National Instruments

next-generation MXIbus (MXI-2), while the VXI-MXI used the first-

generation MXIbus. MXI-2 uses new higher-density connectors and

cables, which means that the VXI-MXI-2 cannot be readily connected

to any first-generation MXIbus device such as the VXI-MXI.

A major benefit of MXI-2 is that it combines the MXIbus functionality

with all the functionality of the INTX enhancement for the VXI-MXI

onto a single connector. The INTX enhancement extends the VMEbus

utility signals (ACFAIL*, SYSRESET*, and SYSFAIL*), all seven

VMEbus interrupts, the eight VXIbus TTL trigger lines, and the

VXIbus CLK10± signals.

As the following table shows, you need only one cable with the

VXI-MXI-2 module, whereas the Enhanced VXI-MXI requires an

additional cable for INTX functionality.

First-Generation MXIbus MXI-2

Enhanced VXI-MXI VXI-MXI-2

MXIbus Cable MXI-2 Cable

INTX Cable