National Instruments MXI-2 Reference Manual page 15

Chapter 1 Introduction
D-size VXI chassis have connections for a P3 connector. The VXI-MXI-2, however,
Note
does not have this connector and, if configured as a Slot 0 controller, cannot provide the
necessary control for VXI devices that need P3 support.
Unless otherwise noted, the term VXI-MXI-2 refers to both the C-size and B-size
Note
modules.
The VME-MXI-2 is not equivalent to the VXI-MXI-2/B, although their form factor
Note
is the same. The VXI-MXI-2/B provides VXI trigger, MODID, and CLK10 support, while
the VME-MXI-2 does not.
MXI-2 Configuration Reference Manual
Optionally, you can use the VXI-MXI-2/B, which can reside in any B-size
VXIbus slot. Although they are functionally equivalent, this manual
describes the C-size and B-size VXI-MXI-2 modules in separate chapters.
This is because there are some differences in how you configure the two
modules. The C-size VXI-MXI-2 is housed in a metal enclosure to improve
EMC performance and to provide easy handling. The B-size module does
not require this enclosure.
The VXI-MXI-2 uses address mapping to convert MXIbus cycles into
VXIbus cycles and vice versa. By connecting to the PCI-MXI-2,
PCI-MXI-2 Universal, or PXI-8320 board, the VXI-MXI-2 links the PCI
bus or the PXI/CompactPCI bus to the VXIbus. The VXI-MXI-2 can
automatically determine whether it is located in VXI Slot 0 and if it is the
MXIbus System Controller.
The VME-MXI-2 module is a single-slot, double-height VMEbus device
with optional VMEbus System Controller functions. It uses address
mapping to convert MXIbus cycles into VMEbus cycles and vice versa, just
like the VXI-MXI-2. By connecting to the PCI-MXI-2, PCI-MXI-2
Universal, or PXI-8320 board, it links the PCI bus or the PXI/CompactPCI
bus to the VMEbus. The VME-MXI-2 can automatically determine if it is
located in the first slot of a VMEbus chassis and if it is the MXIbus System
Controller. The VME-MXI-2 requires that the VMEbus chassis comply
with the VME64 protocol to be able to auto-detect Slot 1.
Also, the VXI-MXI-2 and VME-MXI-2 automatically terminate the
MXIbus if installed as the first or last device in the MXIbus. If installed
in the middle of the MXIbus, both the VXI-MXI-2 and VME-MXI-2
automatically disable MXIbus termination. In addition, you can have up to
64 MB of onboard DRAM on the VXI-MXI-2 and VME-MXI-2 modules
that can either be shared with the VXI/VMEbus and MXIbus or used as a
dedicated data buffer. The MXI-2 products achieve high-performance
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