Hardware manual

EUROCOM-17-5xx 3 Programmers Reference
Hardware Manual 79
3.16 Bus Time-Out
The EUROCOM-17-5xx features two independent, software-
programmable bus time-out modules; one for the local time-out and one
for the VMEbus time-out.
Both time-out modules are located in the VIC and are programmed by
writing the transfer time-out register ($FEC0.10A3). The time-out period
is programmable from 4 µs to 480 µs. Local time-out is not generated
when waiting for VMEbus mastership. This is programmable within the
VIC chip.
Local time-out is set to 32 µs and the VMEbus time-out is set to 16 µs by
RMon. Use the RMon setup menu to change these values.
The VMEbus time-out is generated by the system controller and,
therefore, is only used if the VIC is being used as the system controller.
Switch S3 is used to enable/disable the board’s system controller.
Access to the LEB triggers the local BTO generator.