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Chapter 6 NI-VXI Configuration Utility
VXI/VME-PCI8022 for Solaris 6-24
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National Instruments Corporation
Otherwise, choose either the Yes or No option. Notice that selecting
either of these options overrides the onboard jumper setting on the
VXI-MXI-2, so it will not matter how the jumper is set. You would need
to run the VXI/VME-MXI-2 Configuration Editor again if you decide
to change the VMEbus System Controller (VXI Slot 0) setting at a later
time.
Caution: Do not install a VXI/VME-MXI-2 configured for VMEbus System
Controller (VXI Slot 0) into another slot without first reconfiguring it to
either Non-Slot 0 or automatic configuration. Neglecting to do this could
damage the VXI/VME-MXI-2, the VXI/VMEbus backplane, or both.
This means that you should use either the No option or the Auto option of
this control. For the VXI-MXI-2, you also have the option of changing the
hardware jumper setting.
VXI/VME Bus Timeout Value
The VXI/VMEbus Bus Timeout (BTO) is a watchdog timer for transfers
on the VMEbus Data Transfer bus. After the specified amount of time
has elapsed, the BTO circuitry terminates a VMEbus cycle if no slave
has responded. The VXI/VME-MXI-2 must provide the VXI/VMEbus
BTO for proper operation because when a MXIbus cycle is involved,
the VXI/VMEbus timeout must be disabled and the MXIbus BTO
enabled. You should disable the BTO of any other BTO module
residing in the mainframe. If this is not possible, set its VXI Bus
Timeout control to its maximum setting to give the MXIbus cycles as
much time as possible to complete.
The lowest value in the allowable range is 15 µs and the highest value
is 256 ms. The default value is 125 µs.
Advanced VXI Settings
Click on the Advanced button to reach additional configuration options
for the VXI/VME Bus portion of this editor, as shown in Figure 6-9.
These options are intended for more advanced users.
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