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Chapter 3 Configuration and Installation
© National Instruments Corporation 3-9 VXI-MXI User Manual
configuration allows VXIbus transfers to have short bus timeout values and MXIbus transfers to
have much longer timeout values.
You can either disable the VMEbus timeout value or set it to 100, 200, or 400 µs by moving the
VME BTO Level jumper, as shown in Figure 3-7. The VMEbus timeout is disabled when a
VMEbus cycle maps out of the mainframe, initiating a MXIbus cycle. The configuration of the
VME BTO Chain Position jumper block selects how the VXIbus local bus is used to disable the
VMEbus timeout when outward MXIbus transfers occur. If another device has a BTO module,
remember to enable the BTO on the VXI-MXI and to disable the VMEbus BTO on the other
device.
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100 µs
200 µs
400 µs
DISABLE
VME BTO Level
W6
a. 100 µs BTO (Default Setting)
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100 µs
200 µs
400 µs
DISABLE
VME BTO Level
W6
b. 200 µs BTO
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100 µs
200 µs
400 µs
DISABLE
VME BTO Level
W6
c. 400 µs BTO
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100 µs
200 µs
400 µs
DISABLE
VME BTO Level
W6
d. Disable BTO
Figure 3-7. VMEbus Timeout Value Selection