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Chapter 6 NI-VXI Configuration Utility
©
National Instruments Corporation 6-25 VXI/VME-PCI8022 for Solaris
.
Figure 6-9. Advanced VXI Settings
VXI/VME Auto Retry
The VXI/VME-MXI-2 has an automatic retry feature for cycles that
map from the VXI/VMEbus to the MXIbus. By default this option is
disabled.
Normally, when a cycle maps from the VXI/VMEbus to the MXIbus,
any retry response received on the MXIbus is passed to the
VXI/VMEbus. If you enable the
Auto Retry
feature, the
VXI/VME-MXI-2 automatically retries any MXI cycle that receives
a retry response instead of passing a retry response back to the
VXI/VMEbus. The VXI/VME-MXI-2 automatically continues to retry
the MXI cycle until it receives either a
DTACK
or
BERR
response,
which it then passes to the VXI/VMEbus.
Notice that the VXI/VME-MXI-2 has a limit on the number of
automatic retries it will perform on any one cycle. If the limit is
exceeded and the VXI/VME-MXI-2 receives another retry, it will pass
a retry back to the VXI/VMEbus even though
Auto Retry
is enabled.