Programming
4-3
IRQ Map
Table 4-2 IRQ Map
INT#
Function
IRQ0
System Timer
IRQ1
Keyboard
IRQ2
Interrupt Cascade (reserved)
IRQ3
COM2
IRQ4
COM1
IRQ5
Ethernet 1
IRQ5
PCI Expansion to PMC 2
IRQ6
Floppy
IRQ7
Parallel Port (LPT1)
IRQ8
Real Time Clock
IRQ9
Universe IID
IRQ9
PCI-X Video
IRQ10 Onboard PMC-X
IRQ11 PCI Expansion to PMC 1
IRQ11 Ethernet 2
IRQ12 Mouse
IRQ13 Math Coprocessor (reserved)
IRQ14 Primary IDE
IRQ15 Secondary IDE
The above interrupt mapping is one possible scenario. The user or operating system may choose a
different mapping for some of these interrupts based on what devices are actually in the system and
require interrupts. If COM2 or LPT1 are not used, then these would free up IRQ3 and IRQ7 respectively.
Summary of Contents for XVME-689-VR7
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