Appendix D
Differences and Incompatibilities between the VME-MXI and the VME-MXI-2
VME-MXI-2 User Manual
D-2
© National Instruments Corporation
Configuration Switches and Jumpers
Some of the configurable features of the VME-MXI are software
programmable settings on the VME-MXI-2; some others are now
implemented by automatic configuration circuits on the VME-MXI-2
instead of by onboard switches or jumpers.
One configuration switch on the VME-MXI selected whether the
front-panel pushbutton asserted the VMEbus SYSRESET* or
ACFAIL* signal. This is not implemented on the VME-MXI-2. The
VME-MXI-2 will always assert SYSRESET* when the front-panel
pushbutton is pressed.
The following table lists the configurable features that are automatic on
the VME-MXI-2 and require no attention.
Configurable Feature
VME-MXI-2 Implementation
MXIbus System Controller
Automatic
MXIbus Termination
Switches available to override automatic
detection
VMEbus System Controller
Automatic
The following table lists the configurable features that are
programmable on the VME-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.
Configurable Feature
VME-MXI-2 Implementation
Interlocked Arbitration Mode
VME-MXI-2 Status/Control Register
(VMSR/VMCR) or EEPROM
VMEbus Timeout Length
EEPROM
VMEbus Request Level
EEPROM
MXIbus Timeout Length
Shared MXIbus Status/Control Register
(SMSR/SMCR) or EEPROM
MXIbus Fair Requester
Shared MXIbus Status/Control Register
(SMSR/SMCR) or EEPROM
MXIbus Parity Checking
Shared MXIbus Status/Control Register
(SMSR/SMCR) or EEPROM
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