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

Reserved

 

 

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/SATA Channel

 

 

15

10

Secondary IDE/SATA 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 shared shared shared

 

 

PCI slot 2

—

—

—

—

shared shared shared shared

 

 

IEEE 1394a

—

—

—

—

—

—

shared

—

 

 

LAN (88E8001)

—

—

—

—

—

shared

—

—

 

 

PCI-E x1_1

shared shared

shared shared

—

—

—

—

 

 

PCI-E x1_2

shared shared

shared shared

—

—

—

—

 

 

PCI-E x16_1

shared shared

shared shared

—

—

—

—

 

 

PCI-E x16_2

shared shared

shared shared

—

—

—

—

 

 

USB 1.0 controller 1

—

—

—

shared

—

—

—

—

 

 

USB 1.0 controller 2

—

—

—

shared

—

—

—

—

 

 

USB 1.0 controller 3

—

—

—

shared

—

—

—

—

 

 

USB 1.0 controller 4

—

—

—

shared

—

—

—

—

 

 

USB 2.0 controller

—

—

—

shared

—

—

—

—

 

 

HD audio

shared

—

—

—

—

—

—

—

 

 

SATA JMB360

shared shared

shared shared

—

—

—

—

 

 

On-board SATA

—

—

—

—

—

shared

—

—

 

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

2 - 16

Chapter 2: Hardware information