Hardware Interrupts, Interrupt Normal Use

Hardware Interrupts

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.

The CMX158886 cpuModule supports the standard PC interrupts listed in Table 43. 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.

Table 43 Hardware Interrupts Used on the CMX158886 cpuModule

Interrupt	Normal Use

0	Timer 0

1	Keyboard

2	Cascade of IRQ 8–15

3	COM2

4	COM1

5	Available

6	Floppy

7	Printer

8	Real Time Clock

9	Available, routed to IRQ 2

10	Available

11	Available

12	Bus Mouse

141	Primary IDE hard disk

151	ATA/IDE Disk Chip socket

1.IRQs 14 and 15 may be available if the IDE controller is configured in Native Mode (refer to IDE Controller Configuration—page 67)

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. To reserve an IRQ for a legacy device, refer to the PnP/PCI Configuration Setup fields in the BIOS.

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 Setup.

For external devices that require Legacy/ISA interrupts, a serial interrupt signal is available which permits access to the CPU’s hardware interrupts. One pair of Legacy/ISA DMA request/grant signals are also available. For more information on the serial interrupt signal, and the DMA request/grand pair, refer to Bridge Link (CN4) in Chapter 3, Connecting the cpuModule

BDM-610000049 Rev G

Chapter 4: Using the cpuModule 61

BDM-610000049 specifications

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