2.5.3
Interrupt assignments
Standard interrupt assignments
IRQ
Priority
0
1
2
4
5
6
7
8
9
10
11
12
13
14
* These IRQs are usually available for PCI devices.
IRQ assignments for this motherboard
IOH
PCIE16_1
PCIE16_2
ICH
PCIE4_1
LAN
PCI_1
USB controller 1
USB controller 2
USB controller 3
USB controller 4
USB controller 5
USB controller 6
USB 2.0 controller 1
USB 2.0 controller 2
SATA controller 1
SATA controller 2
Audio Azalia
2-24
Standard function
1
System Timer
2
Keyboard Controller
–
Redirect to IRQ#9
12
Communications Port (COM1)*
13
IRQ Holder for PCI Steering*
14
Reserved
15
Reserved
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
Reserved
8
Numeric Data Processor
9
Primary IDE Channel
24
25
shared
–
–
–
A
shared
–
shared
–
–
–
shared
–
–
–
–
–
–
–
26
27
–
–
–
–
B
C
D
–
–
–
shared
–
–
–
–
–
–
–
–
–
shared
–
shared
–
–
–
–
–
–
–
–
–
shared
–
–
–
–
shared
–
–
–
–
–
–
–
–
–
–
28
29
30
–
–
–
–
–
shared
E
F
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
shared
–
–
–
–
–
–
shared
–
shared
–
–
–
Chapter 2: Hardware information
31
–
–
G
H
–
–
–
–
–
–
–
shared
–
–
–
–
–
–
–
–
–
–
–
shared
–
–
–
–
–
–
shared
–