1.8.3Interrupt assignments

Standard interrupt assignments

IRQ

Priority

Standard Function

 

 

 

0

1

System Timer

1

2

Keyboard Controller

2

Re-direct to IRQ#9

3

12

IRQ holder for PCI steering*

4

13

Communications Port (COM1)*

5

14

IRQ holder for PCI steering*

6

15

Floppy Disk Controller

7

16

Printer Port (LPT1)*

8

3

System CMOS/Real Time Clock

9

4

ACPI*

10

5

SMBus Controller*

11

6

IRQ holder for PCI steering*

12

7

PS/2 Compatible Mouse Port*

13

8

Numeric Data Processor

14

9

IDEIRQ (legacy mode, combined mapped as primary),

 

 

SMasterATA1 (Master), SATA3 (Secondary)

15

10

IDEIRQ (legacy mode, combined mapped as secondary),

 

 

SATA2 (Master), SATA4 (Secondary)

* These IRQs are usually available for PCI devices.

IRQ assignments for this motherboard

 

 

 

 

 

 

A

B

C

D

E

F

G

H

 

 

 

 

 

 

 

 

 

PCI1

shared

PCI2

shared

PCIEX16_1

shared

PCIEX4_1

shared

—­

On-board ESATA, SATA_RAID

shared

On-board PRI_IDE

shared

On-board HD Audio (AD1988)

shared

On-board GbEthernet (RTL8111B)

shared

USB 2.0 EHCI#1

shared

USB 2.0 EHCI#2

shared ­

USB12 UHCI#1

shared

USB34 UHCI#2

shared

USB56 UHCI#3

shared

USB78 UHCI#4

shared

USB910 UHCI#5

shared

SATA1, SATA2 (ICH8)

shared

SATA3, SATA4 (ICH8)

shared

1-24

Chapter 1: Product introduction