2.5.2
Interrupt assignments
Standard interrupt assignments
IRQ
Priority Standard function
0
1
System Timer
1
2
Keyboard Controller
2
–
Redirect to IRQ#9
4
12
Reserved
5
13
Reserved
6
14
Floppy Disk Controller
7
15
Reserved
8
3
System CMOS/Real Time Clock
9
4
Reserved
10
5
Reserved
11
6
Reserved
12
7
Reserved
13
8
Numeric Data Processor
14
9
Reserved
ICH
A
B
C
D
E
F
G
H
LAN1 (8111C)
–
shared
–
–
–
–
–
–
LAN2 (8111C)
–
–
shared
–
–
–
–
–
Marvell 6121
–
–
–
shared
–
–
–
–
Marvell SAS
shared
–
–
–
–
–
–
–
USB controller 1
–
–
–
–
–
–
–
shared
USB controller 2
–
–
–
shared
–
–
–
–
USB controller 3
–
–
shared
–
–
–
–
–
USB controller 4
shared
–
–
–
–
–
–
–
USB controller 5
–
–
–
–
–
shared
–
–
USB controller 6
–
–
–
shared
–
–
–
–
USB 2.0 controller 1
–
–
–
–
–
–
–
shared
USB 2.0 controller 2
–
–
shared
–
–
–
–
–
SATA controller 1
–
–
–
–
shared
–
–
–
SATA controller 2
–
–
–
–
shared
–
–
–
1394
–
shared
–
–
–
–
–
–
Audio Azalia
–
–
–
–
–
–
shared
–
IRQ assignments for this motherboard
2-18
Chapter 2: Hardware information