1.8.3 I nterrupt assi gnments Standard i nterrupt assi gnments

IRQ

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

 

shared

—

—

—

—

—

—

—

PCI slot 2

 

—

shared

—

—

—

—

—

—

PCI slot 3

 

—

—

shared

—

—

—

—

—

PCI x4 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 audio

 

—

shared

—

—

—

—

—

—

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.

ASUS P5VDC-X

1-21