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1 standard interrupt assignments, 2 irq assignments for this motherboard, 12 chapter 1: product introduction – Asus P4PE2-X User Manual

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1-12

Chapter 1: Product introduction

1.8.1 Standard interrupt assignments

IRQ

Priority

Standard Function

0

1

System Timer

1

2

Keyboard Controller

2

N/A

Programmable Interrupt

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

Advance AC’97 CODEC

11*

6

Standard PCI Graphics Adapter (VGA)

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.

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 arise between
the two PCI groups making the system unstable and the card inoperable.

1.8.2 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 slot 4

shared

AGP slot

shared

Onboard USB controller HC1 shared

Onboard USB controller HC2

shared

Onboard USB controller HC3

shared

Onboard USB 2.0 controller

shared

Onboard LAN

shared