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1.5.3
Interrupt assignments
Standard interrupt assignments
IRQ
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
* These IRQs are usually available for ISA or PCI devices.
IRQ assignments for this motherboard
PCI slot 1
PCI slot 2
PCI slot 3
Onboard USB controller 1
Onboard USB controller 2
Onboard USB controller 3
Onboard USB controller 4
Onboard USB 2.0 controller
Onboard AC `97 Audio
Onboard IDE Controller
Onboard SATA Controller
Onboard PCI LAN (10/100 Mbps)
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.
1-18
Priority
Standard Function
1
System Timer
2
Keyboard Controller
-
Re-direct to IRQ#9
11
Communications Port (COM2)*
12
Communications Port (COM1)*
13
IRQ holder for PCI steering*
14
Floppy Disk Controller
15
Printer Port (LPT1)*
3
System CMOS/Real Time Clock
4
IRQ holder for PCI steering*
5
IRQ holder for PCI steering*
6
IRQ holder for PCI steering*
7
PS/2 Compatible Mouse Port*
8
Numeric Data Processor
9
Primary IDE Channel
10
Secondary IDE Channel
A
—
—
—
—
—
—
used
—
—
shared
—
—
—
shared
B
C
D
—
—
—
—
—
—
—
—
—
—
—
—
—
—
shared
—
shared
—
—
—
—
—
—
—
—
—
—
shared
—
—
—
shared
—
—
Chapter 1: Product introduction
E
F
G
—
shared
—
—
—
used
used
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
H
—
—
—
shared
—
—
—
shared
—
—
—
—
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