User manual

Appendix D Differences and Incompatibilities between the VXI-MXI and the VXI-MXI-2
VXI-MXI-2 User Manual D-2 © National Instruments Corporation
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.
Configuration Switches and Jumpers
Some of the configurable features of the VXI-MXI are software
programmable settings on the VXI-MXI-2; some others are now
implemented by automatic configuration circuits on the VXI-MXI-2
instead of by onboard switches or jumpers.
One configuration switch on the VXI-MXI selected whether the front-
panel pushbutton asserted the VMEbus SYSRESET* or ACFAIL*
signal. This is not implemented on the VXI-MXI-2. The VXI-MXI-2
will always assert SYSRESET* when the pushbutton is pressed.
The following table lists the configurable features that are automatic on
the VXI-MXI-2 and require no attention.
Configurable Feature VXI-MXI-2 Implementation
MXIbus System Controller Automatic
MXIbus Termination Switches available to override automatic
detection
VXIbus Slot 0 Jumper available to override automatic
detection
The following table lists the configurable features that are
programmable on the VXI-MXI-2, either through a writable register or
a writable location in the onboard EEPROM. Keep in mind that
configurations you write to a register will be lost during any hard reset
or power cycle, while configurations you write to the EEPROM will
remain even through resets and power cycles. You can easily configure
these features through the VXIplug&play soft front panel, as described
in Chapter 7, VXIplug&play for the VXI-MXI-2.
Configurable Feature VXI-MXI-2 Implementation
Interlocked Arbitration Mode VXI-MXI-2 Status/Control Register
(VMSR/VMCR) or EEPROM
VMEbus Timeout Length EEPROM
VMEbus Request Level EEPROM