2.5.3 I nterrupt assi gnments

Standard i nterrupt assi gnments

IRQ

Priority

Standard Function

0

1

System Timer

1

2

Keyboard Controller

2

–

Re-direct to IRQ#9

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 Channel

15

10

Secondary IDE Channel

* These IRQs are usually available for ISA or PCI devices.

I RQ assi gnments for thi s motherboard

 

A

B

C

D

E

F

G

H

 

PCI slot 1

shared

—

—

—

—

—

—

—

 

PCI slot 2

—

shared

—

—

—

—

—

—

 

PCI slot 3

—

—

shared

—

—

—

—

—

 

Onboard USB 1.0 controller

shared

—

—

—

—

—

—

—

 

Onboard USB 2.0 controller

shared

—

—

—

—

—

—

—

 

Onboard LAN1

shared

—

—

—

—

—

—

—

 

Onboard LAN2

—

shared

—

— — — — —

 

Onboard PCI SATA RAID (SI)

—

—

—

shared

—

—

—

—

 

Onboard 1394a

shared

—

—

—

—

—

—

—

 

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

2.5.4 PCI sl ots

The PCI slots support cards such as a LAN card, SCSI card, USB card, and other cards that comply with PCI specifications. The figure shows a LAN card installed on a PCI slot.

2-16

Chapter 2: Hardware information