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

—

—

—

—

shared

—

—

—

 

PCI slot 2

—

—

—

—

—

—

shared

—

 

PCI E x8 slot

shared

—

—

—

—

—

—

—

 

PCI E x8 slot

shared

—

—

—

—

—

—

—

 

Onboard USB controller 1

shared

—

—

—

—

—

—

—

 

Onboard USB controller 2

—

shared

— — — — — —

 

Onboard USB controller 3

—

—

used

—

—

—

—

—

 

Onboard USB controller 4

—

—

—

shared

—

—

—

—

 

Onboard USB 2.0 controller

shared

—

—

—

—

—

—

—

 

Onboard IDE port

shared

—

—

—

—

—

—

—

 

Onboard SATA port

—

shared

—

—

—

—

—

—

 

Onboard PCI E x1 LAN1

shared

—

—

—

—

—

—

—

 

Onboard PCI E x1 LAN2

—

shared

—

—

—

—

—

—

 

Onboard VGA

—

—

—

—

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 P5MT-M

2 - 17