2.5.3Interrupt assignments

Standard Interrupt assignments

IRQ

Priority

Standard function

0

1

System Timer

1

2

Keyboard Controller

2

-

Programmable Interrupt

3*

11

Communications Port (COM2)

4*

12

Communications Port (COM1)

5*

13

--

6

14

Floppy Disk Controller

7*

15

--

8

3

System CMOS/Real Time Clock

9*

4

ACPI Mode when used

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 x16 slot (x16 link)

The onboard PCIE3 and PCIE5 slots provides one x16 Gen3 link to CPU1 and auto switches to x8 link if PCIE4/PCIE6 is occupied. This slot supports VGA cards and various server class high performance add-on cards.

2.5.5PCI Express x8 slot (x8 link)

The onboard PCIE2 and PCIE4 slots provide one x8 Gen3 link to CPU1. These slots support VGA cards and various server class high performance add-on cards.

The onboard PCIE6 provide one x8 Gen3 link to CPU1 and supports MIO.

2.5.6PCI Express x8 slot (x4 link)

The onboard PCIE1 slot provides one x4 Gen2 link to Intel C612 PCH chipset.This slot support various server class high performance add-on cards.

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