2.5.3

Interrupt assignments

Standard interrupt assignments

IRQ

Priority

Standard Function

0

1

System Timer

1

2

Keyboard Controller

2

—

Re-direct to IRQ#9

3

11

—

4

12

Communications Port (COM1)*

5

13

IRQ holder for PCI steering*

6

14

Floppy Disk Controller

7

15

Printer Port (LPT1)*

8

3

System CMOS/Real Time Clock

9

4

IRQ holder for PCI steering*

10

5

IRQ holder for PCI steering*

11

6

IRQ holder for PCI steering*

12

7

PS/2 Compatible Mouse Port*

13

8

Numeric Data Processor

14

9

Primary IDE Channel

15

10

Secondary IDE Channel

* These IRQs are usually available for ISA or PCI devices.

IRQ assignments for this motherboard

 

A

B

C

D

E

F

G

H

 

 

 

 

 

 

 

 

 

PCI slot 1

—

shared

—

—

—

—

—

—

PCI slot 2

—

—

—

—

—

shared

—

—

PCI slot 3

—

—

—

—

—

—

shared

—

PCI E x16 slot

shared

—

— — — — — —

PCI E x1 slot 1

shared

—

— — — — — —

PCI E x1 slot 2

—

shared

—

— — — — —

PCI E x1 slot 3

—

—

shared

—

—

— — —

Onboard USB controller 0

—

—

—

— shared

—

—

—

Onboard USB controller 1

—

shared

—

— — — — —

Onboard USB controller 2

—

—

shared

—

—

— — —

Onboard USB controller 3

—

—

—

shared

—

—

—

—

Onboard EHCI controller

shared

—

— — — — — —

Onboard IDE port

—

—

—

—

—

—

shared

—

Onboard SATA port

—

shared

— — — — — —

Onboard Audio controller

shared

—

—

—

—

— — —

Onboard LAN controller

—

—

—

shared

—

—

—

—

Onboard PCI IDE RAID (ITE)

—

—

—

— shared

—

—

—

2-18

Chapter 2: Hardware information