National Instruments NI-VXI - Manual (Page 19)

Chapter 1 Overview of NI-VXI
NI-VXI User Manual 1-6 © National Instruments Corporation
Because MXI-2 incorporates all of these new signals into a single
connector, the triggers, interrupts, and utility signals can be extended
not only to other mainframes but also to the local CPU in all MXI-2
products using a single cable. Thus, MXI-2 lets CPU interface boards
such as the PCI-MXI-2 perform as though they were plugged directly
into the VXI/VME backplane.
In addition, MXI-2 boosts data throughput performance past
previous-generation MXIbus products by defining new
high-performance protocols. MXI-2 is a superset of MXI. However,
MXI-2 defines synchronous MXI block data transfers which surpass
previous block data throughput benchmarks. The new synchronous
MXI block protocol increases MXI-2 throughput to a maximum of
33 MB/s between two MXI-2 devices. All National Instruments MXI-2
boards are capable of initiating and responding to synchronous MXI
block cycles.