1-22
Chapter 1: Product introduction
1.8.3
Interrupt assignments
IRQ
Priority
Standard Function
0
1
System Timer
1
2
Keyboard Controller
2
—
—
3
11
IRQ holder for PCI steering*
4
12
Communications Port (COM1)
5
13
Standard IRQ holder for PCI steering
6
14
Floppy Disk Controller
7
15
Printer Port (LPT1)
8
3
System CMOS/Real Time Clock
9
4
Microsoft ACPI-Compliant Sytem
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
* These IRQs are usually available for PCI devices.
A
B
C
D
E
F
G
H
PCI1
—
—
—
—
shared
—
—
—
PCI2
—
—
—
—
—
shared
—
—
PCI3
—
—
—
—
—
—
shared
—
PCIEx16_1
shared
—
—
—
—
—
—
—
PCIEx1_1
shared
—
—
—
—
—
—
—
PCIEx1_2
—
shared
—
—
—
—
—
—
PCIEx1_3
—
—
shared
—
—
—
—
—
USB controller 1
—
—
—
—
—
—
—
shared
USB controller 2
—
—
—
shared
—
—
—
—
USB controller 3
—
—
shared
—
—
—
—
—
USB controller 4 shared
—
—
—
—
—
—
—
USB 2.0 controller
—
—
—
—
—
—
—
shared
HD audio
shared
—
—
—
—
—
—
—
LAN
—
Used
—
—
—
—
—
—
Standard interrupt assignments
IRQ assignments for this motherboard