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Setting the Interrupt
Priority
16 Getting Started
The Form C switch generates an interrupt after a channel has been closed.
These interrupts are sent to, and acknowledgments are received from, the
command module (E1406, for example) via the VXIbus backplane interrupt
lines.
For most applications where the Form C switch is installed in a C-Size
mainframe, the interrupt priority jumper does not have to be moved. This is
because the VXIbus interrupt lines have the same priority and interrupt
priority is established by installing modules in slots numerically closest to the
command module. Thus, slot 1 has a higher priority than slot 2, slot 2 has a
higher priority than slot 3, etc.
See Figure 1-5 to change the interrupt priority. You can select eight different
interrupt priority levels. Level 1 is the lowest priority and Level 7 is the
highest priority. Level X disables the interrupt. The Form C switch factory
setting is Level 1. To change the interrupt priority, remove the 4-pin jumper
from the old priority location and reinstall in the new priority location. If the
4-pin jumper is not used, the two jumper locations must have the same
interrupt priority level selected.
NOTE
The interrupt priority jumper MUST be installed in position 1 when using the
E1406 Command Module. Level X interrupt priority should not be used
under normal operating conditions. Changing the priority level jumper is not
recommended. Do not change unless specifically instructed to do so.
Using 2-Pin
Jumper
Using 4-Pin
Jumper
IRQ
IRQ
7
7
6
6
5
5
4
4
3
3
2
2
1
1
X
X
Figure 1-5. Setting the Interrupt Priority
Logical Address
Switch Location
Interrupt
Priority
Location
Chapter 1
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