Hardware manual

EUROCOM-17-5xx 3 Programmers Reference
Hardware Manual 81
3.18 Interrupt Sources
All seven priority levels of the VMEbus are implemented. The local
modules can be served by interrupts without restricting the VMEbus
interrupt capacity.
The interrupt handler is a part of the VIC gate array. This device contains
seven registers to handle seven VMEbus interrupt sources. Each IRQ line
on the VMEbus is enabled and disabled separately. Additionally, the level
passed to the CPU can be changed for each of these lines through the
control registers of the VIC.
The VIC also supports seven local interrupt request inputs, called LIRQ1
to LIRQ7. These lines are connected to several local devices generating an
IRQ (referenced by Table48: ‘VIC Interrupt Priority Scheme’).
Additionally, the VIC can generate local interrupts from eight
interprocessor communication registers, ACFAIL, SYSFAIL, arbitration
time-out, posted write cycles, and DMA completion.
To change the IRQ values in the VIC registers, use the RMon setup menu.
Refer to the VIC068 data sheet for more information.