HP E1368A manual Selecting the Interrupt Priority, Interrupt Priority Selection

Selecting the Interrupt Priority

The Microwave Switch modules generate interrupts after a channel has been closed or opened. These interrupts are sent to, and acknowledgments are received from, the slot 0 module via the VXIbus backplane interrupt lines.

For most applications where the Microwave Switch modules are installed in an HP 75000 Series B or Series C mainframe, these jumpers do 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 slot 0 module. Thus, slot 1 (internal to the Series B mainframe) has a higher priority than slot 2 (also internal), slot 2 has a higher priority than slot 3, etc.

Refer to Figure 2-2 to change the interrupt priority. You can select seven different interrupt priority levels. Level 1 is the lowest priority and Level 7 is the highest priority. The Module’s factory setting is Level 1. To change, clip out and remove two jumpers from the old priority location. Install and solder two new jumpers in the new priority location (Figure 2-2 shows a priority change from 1 to 7).

Note Both jumper locations must have the same interrupt priority level jumper installed. Changing the priority level jumpers is not recommended. Do not change unless specifically instructed to do so.

NOTE:

In this example, the priority jumpers are moved from position 1 to position 7 (lowest priority to highest priority).

Figure 2-2. Interrupt Priority Selection

Chapter 2 Configuring the HP E1368A/69A/70A Modules 19