2.5.3Interrupt assignments

Standard interrupt assignments

I R Q

Priority

Standard Function

 

0

1

System Timer

 

 

 

 

 

1

2

Keyboard Controller

 

 

 

 

 

2

—

Re-direct to IRQ#9

 

 

 

 

 

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

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.

2.5.4PCI Express x8 slot

The onboard PCI Express x8 slot provides x4 link to the MCH. This slot is designed for various server class high performance add-on cards like SCSI RAID card, fiber-channel card, etc.

ASUS NCLV-D (A)

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