User`s manual

BDM-610000082 Rev A Chapter 4: Using the cpuModule 55

Hardware Interrupts

The CMX34GS cpuModule supports the standard PC interrupts listed in Table 33. Interrupts not in use by

hardware on the cpuModule itself are listed as available. Similarly, if the operating system is using APIC, more

IRQs will be available.

Note If you add any expansion modules or other peripherals to the system, you must ensure they do not

use interrupts needed by the cpuModule, or malfunctions will occur.

Table 33 Hardware Interrupts Used on the CMX34GS cpuModule

Interrupt Normal Use

0Timer 0

1Keyboard

2Cascade of IRQ 8–15

3COM2

4COM1

5Available

6Available

7Available

8Real Time Clock

9Available, routed to IRQ 2

10 Available

11 Available

12 Available

1. IRQs 14 and 15 are available when the SATA controller is

configured in Native Mode (BIOS default), but will be

utilized the SATA controller is configured for Legacy Mode.

Available

Note The cpuModule has onboard PCI devices that will claim IRQ lines. In some instances, a PCI device

will claim an IRQ line that is required by a legacy device.

Note A device’s hardware interrupt will be available for use if the given device is not present in the system

and the device is disabled in the BIOS setup utility.