American Megatrends IB903F User Manual download pdf (Page 53)

APPENDIX

IB903F User’s Manual 49

B. Interrupt Request Lines (IRQ)

Peripheral devices use interrupt request lines to notify CPU for the

service required. The following table shows the IRQ used by the devices

on board.

Level

Function

IRQ 0

System timer

IRQ 1

Standard 101/102-Key

IRQ 3

Communications Port (COM2)

IRQ 4

Communications Port (COM1)

IRQ 6

Communications Port (COM3)

IRQ 6

Communications Port (COM4)

IRQ 8

System CMOS/real time clock

IRQ 12

PS/2 Compatible Mouse

IRQ 13

Numeric data processor

IRQ 16

High Definition Audio Controller

IRQ 16

PCI standard PCI-to-PCI bridge

IRQ 17

Standard Enhanced PCI to USB Host Controller

IRQ 17

Standard Enhanced PCI to USB Host Controller

IRQ 18

High Definition Audio Controller

IRQ 18

Standard Open HCD USB Host Controller

IRQ 18

Standard Open HCD USB Host Controller

IRQ 18

Standard Open HCD USB Host Controller

IRQ 18

Standard Open HCD USB Host Controller

IRQ 19

PCI standard PCI-to-PCI bridge

IRQ 19

AMD SATA Controller (IDE Mode)

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American Megatrends IB903F User Manual Page 53

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