3Expansion

H/W .

SETUPCards

3. HARDWARE SETUP

The following table lists the default IRQ assignments for standard PC devices. Use this table when configuring your system and for resolving IRQ conflicts.

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

Sound Card (sometimes LPT2)

 

 

 

6

14

Floppy Disk Controller

 

 

 

7*

15

Printer Port (LPT1)

 

 

 

8

3

System CMOS/Real Time Clock

 

 

 

9*

4

ACPI Mode when enabled

 

 

 

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.

Interrupt Request Table for this Motherboard

Interrupt requests are shared as shown by the following table:

 

INT-A

INT-B

INT-C

INT-D

PCI slot 1

shared

—

—

—

 

 

 

 

 

PCI slot 2

—

shared

—

—

 

 

 

 

 

Onboard VGA

shared

—

—

—

 

 

 

 

 

Onboard LAN

—

—

shared

—

 

 

 

 

 

Onboard USB controller

—

—

—

not shared

 

 

 

 

 

Onboard Audio

—

—

shared

—

 

 

 

 

 

AMR

—

shared

—

—

 

 

 

 

 

IMPORTANT: If using PCI cards on shared slots, make sure that the drivers support “Share IRQ” or that the cards do not need IRQ assignments. Conflicts will arise between the two PCI groups that will make the system unstable or cards inoperable.

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ASUS CUSI-FX User’s Manual