2.5.3Interrupt assignments

Standard interrupt assignments

 

I R Q

Priority

Standard Function

 

 

0

1

System Timer

 

 

 

 

 

 

 

1

2

Keyboard Controller

 

 

 

 

 

 

 

2

•

Re-direct to IRQ#9

 

 

3

11

Communications Port (COM2)*

 

 

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

—

—

—

—

—

—

used

—

 

 

 

 

 

 

 

 

 

 

 

 

 

PCI slot 2

—

shared

—

—

—

—

—

—

 

 

PCI slot 3

—

—

—

—

—

used

—

—

 

 

PCI E x1 slot 1

shared

—

—

—

—

—

—

—

 

 

PCI E x1 slot 2

—

—

shared

—

—

—

—

—

 

 

PCI E x1 slot 3

—

—

—

shared

—

—

—

—

 

 

PCI E x16 slot

shared

—

—

—

—

—

—

—

 

 

Onboard USB controller 1

—

—

—

—

—

—

—

shared

 

 

Onboard USB controller 2

—

—

—

shared

—

—

—

—

 

 

Onboard USB controller 3

—

—

shared

—

—

—

—

—

 

 

Onboard USB controller 4

shared

—

—

—

—

—

—

—

 

 

Onboard USB 2.0 controller

—

—

—

—

—

—

—

shared

 

 

Onboard LAN

—

shared

—

—

—

—

—

—

 

 

Onboard Azalia audio

shared

—

—

—

—

—

—

—

 

 

Onboard PCI IDE RAID (ITE)

—

—

—

—

used

—

—

—

 

 

 

 

 

 

 

 

 

 

 

 

When using PCI cards on shared slots, ensure that the drivers support “Share IRQ” or that the cards do not need IRQ assignments. Otherwise, conflicts will arise between the two PCI groups, making the system unstable and the card inoperable.

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Chapter 2: Hardware information