© National Instruments Corporation
D-1
VME-MXI-2 User Manual
Differences and
Incompatibilities between the
VME-MXI and the VME-MXI-2
D
Appendix
This appendix describes the differences and incompatibilities between
the first-generation MXIbus-to-VMEbus interface, the VME-MXI, and
the VME-MXI-2. This information may be helpful for users of the
VME-MXI who are moving to the VME-MXI-2.
MXIbus Connector
The VME-MXI-2 interfaces the VMEbus to the National Instruments
next-generation MXIbus (MXI-2), while the VME-MXI used the first-
generation MXIbus. MXI-2 uses new higher-density connectors and
cables, which means that the VME-MXI-2 cannot be readily connected
to any first-generation MXIbus device such as the VME-MXI.
A major benefit of MXI-2 is that it combines the MXIbus functionality
with all the functionality of the INTX enhancement for the VME-MXI
onto a single connector. The INTX enhancement extends the VMEbus
utility signals (ACFAIL*, SYSRESET*, and SYSFAIL*) and all seven
VMEbus interrupts.
As the following table shows, you need only one cable with the
VME-MXI-2 module, whereas the Enhanced VME-MXI requires an
additional cable for INTX functionality.
First-Generation MXIbus
MXI-2
Enhanced VME-MXI
VME-MXI-2
MXIbus Cable
MXI-2 Cable
INTX Cable
In addition to the INTX functionality, MXI-2 incorporates new data
transfer protocols that achieve higher performance than is possible on
the first-generation MXIbus.
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