2.5.3Interrupt 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 Compatible mode, Mapped as

 

 

Primary Channel/Master-SATA1/Slave-SATA3

15

10

IDEIRQ Compatible mode, Mapped as

 

 

Secondary Channel/Master-SATA2/Slave-SATA4

*These IRQs are usually available for 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

—

PCIEX16_1

shared

—

—

—

—

—

—

—

PCIEX1_1

shared

—

—

—

—

—­

—

—

PCIEX1_2

—

shared

—

—

—

—

—

—

PCIEX1_3

—

—

shared

—

—

—

—

—

GbEthernet (Attansic L1)

—

—

—

shared

—

—

—

—

ESATA, SATA_RAID

shared

—

—

—

—

—

—

—

PRI_IDE (JMicron363)

shared

—

—

—

—

—

—

shared

IEEE 1394a (VIA 6307)

—

—

—

—

—

shared

—

—

HD Audio (ADI1988A)

—

—

—

—

—

—

shared

—

USB 2.0 EHCI#1

—

—

—

—

—

—

—

shared

USB 2.0 EHCI#2

—

—

shared

—

—

—

—

—

USB12 OBCI#1

—

—

—

—

—

—

—

shared

USB34 OBCI#2

—

—

—

—

—

—

shared

—

USB56 OBCI#3

—

—

shared

—

—

—

—

—

USB78 OBCI#4

shared

 

— — — — — —

USB910 OBCI#5

—

shared

—

—

—

—

 

—

SATA1,2, 3, 4, 5, 6 (ICH8)

—

—

—

shared

—

—

—

—

ASUS P5B-E

2-19