Figure 3-7. Vmebus Timeout Value Selection - National Instruments VXI-MXI User Manual

Chapter 3
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.
W6
VME BTO Level
a. 100 µs BTO (Default Setting)
W6
VME BTO Level
c. 400 µs BTO
© National Instruments Corporation
100 µs
200 µs
400 µs
DISABLE
100 µs
200 µs
400 µs
DISABLE

Figure 3-7. VMEbus Timeout Value Selection

W6
VME BTO Level
b. 200 µs BTO
W6
VME BTO Level
d. Disable BTO
3-9
Configuration and Installation
100 µs
200 µs
400 µs
DISABLE
100 µs
200 µs
400 µs
DISABLE
VXI-MXI User Manual