Interrupt Selection - Xycom XVME-976/202 Manual

Interrupt Selection

Each port can be assigned to an interrupt in the range IRQ2 - IRQ7. Within
this range, there are no restrictions on the choice of interrupts, and the inter-
rupt assignments must be unique. Table 2-8 lists some commonly used I/O
port interrupts.
Implement your interrupt selections by configuring the appropriate jumper
group, according to the table below.
Connector
J1
J2
J3
Within a given jumper group, shorting a particular jumper pin pair assigns a
corresponding interrupt, as shown in Table 2-10.
Pair
Shorted
Interrupt
You are not required to assign an interrupt to a port, however, you will as-
sign interrupts to ports that have incoming data. The parallel port does not
usually need to have an interrupt if it is used solely as an output port, such as
a printer port. To assign an interrupt to a port, short the corresponding pins
on the jumper group for that port. Be sure to short pins 13/14 which will
connect a pull-down resistor to the interrupt line.
If COM1 (Port 3F8) or COM2 (Port 2F8) is selected for use on the XVME-
956/400, check the BIOS set-up menu on the XVME PC/AT. Type
<CTRL><ALT> S to get into set-up. Then disable the internal COM port by
setting it to off.
Table 2-8. Common I/O Port Interrupts
Port
LPT1
LPT2
COM1
COM2
COM3
COM4
Table 2-9. Interrupt Jumper Groups
Port
RS232C serial port COMA Op-
tional serial port COMB
Parallel port
Table 2-10. Interrupt Selection Jumper Pins
1/2 ¾ 5/6
IRQ2 IRQ3 IRQ4
Chapter 2 – SSP Installation (XVME-956/400)
Interrupt
IRQ7
IRQ5
IRQ4
IRQ3
Jumper Group
W4
W5
W6
7/8 9/10 11/12
IRQ5 IRQ6 IRQ7
13/14
Pull Down
2-5