2.5.3
Interrupt assignments
Standard interrupt assignments
IRQ
Priority
0
1
2
4
12
5
13
6
14
7
15
8
9
10
11
12
13
14
* These IRQs are usually available for PCI devices.
IRQ assignments for this motherboard
PCIE x16
PCIE x1_1
PCIE x1_2
PCI1
LAN
Onboard 880G Video
Controller
USB 3.0 controller
Onchip SATA Controller
HD Audio
2-14
Standard function
1
System Timer
2
Keyboard Controller
–
Redirect to IRQ#9
Communications Port (COM1)*
IRQ Holder for PCI Steering*
Reserved
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
A
B
–
–
–
shared
–
–
–
–
–
–
–
–
–
–
–
–
shared
–
C
D
E
shared
–
–
–
–
–
shared
–
–
–
–
shared
shared
–
–
shared
–
–
–
shared
–
–
shared
–
–
–
–
Chapter 2: Hardware information
F
G
H
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–