Appendix D
Differences and Incompatibilities between the VME-MXI and the VME-MXI-2
VME-MXI-2 User Manual
D-4
© National Instruments Corporation
The MXSRSTINT, MXACFAILINT, and MXSYSFINT bits are no
longer implemented in the VME-MXI-2 Status Register (VMSR).
Likewise, the MXSRSTEN and MXACFAILEN bits in the
VME-MXI-2 Control Register (VMCR) are no longer implemented.
For more information about these bits, refer to the following section,
Local Interrupt Conditions.
Local Interrupt Conditions
The first-generation MXIbus has a single interrupt line. MXI-2 has
seven interrupt lines, which correspond to the VMEbus interrupt lines.
The VME-MXI has some interrupt conditions that would assert the
single MXIbus interrupt directly. Since MXI-2 does not have this single
MXIbus interrupt, the register bits that would enable these conditions
are not implemented on the VME-MXI-2. Specifically, the
MXSRSTINT, MXSRSTEN, MXACFAILINT, MXACFAILEN, and
MXSYSFINT bits in the VME-MXI-2 Status/Control Register
(VMSR/VMCR) are not implemented. Also, the entire MXIbus IRQ
Configuration Register (offset 24 hex on the VME-MXI) is not
implemented.
As an alternative, all these interrupt conditions can be routed to
one of the VMEbus interrupt lines, which then can be routed to
the corresponding MXI-2 interrupt line. Also, the utility signals
SYSRESET*, ACFAIL*, and SYSFAIL* can be routed to MXI-2 to
be detected at the destination as a utility signal rather than generating
an interrupt and sending the interrupt to the destination. In fact, this
is the only solution available for the SYSRESET* signal on the
VME-MXI-2. The VME-MXI-2 cannot generate an interrupt from
SYSRESET*.
Refer to the register descriptions for the VXIbus Interrupt
Configuration Register (VICR), VXIbus Utility Configuration
Register (VUCR), and VMEbus Interrupt Status/Control Register
(VISTR/VICTR) in Chapter 4 for more information on these
alternatives to the local interrupt conditions on the single MXIbus
interrupt line. Notice that these same registers and solutions work on an
Enhanced VME-MXI when the destination has an INTX connection.
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