2.5.3
Interrupt assignments
IRQ
Priority
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
* These IRQs are usually available for PCI devices.
IRQ assignments for this motherboard
PCI slot 1
PCI slot 2
LAN (8001)
SATA (368)
PCIe x16_1
PCIe x16_2
PCIe x1_1
PCIe x1_2
PCIe x1_3
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
2-20
Standard function
1
System timer
2
Keyboard controller
–
Re-direct to IRQ#9
11
IRQ holder for PCI steering*
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
SATA Primary IDE (legacy mode)
10
SATA Secondary IDE (legacy mode)
A
B
shared
–
–
shared
–
–
shared
–
shared
–
shared
–
shared
–
–
–
–
–
–
–
–
–
–
–
shared
–
–
–
–
–
–
–
–
–
–
–
–
–
C
D
E
–
–
–
–
–
–
shared
–
–
–
–
–
–
–
–
–
–
–
–
–
–
shared
–
–
–
shared
–
–
–
–
–
shared
–
shared
–
–
–
–
–
–
–
–
shared
–
–
–
–
–
shared
–
–
–
shared
–
–
–
–
Chapter 2: Hardware information
F
G
H
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
shared
–
–
–
–
–
–
–
–
–
shared
–
–
–
–
–
–
–
shared
–
–
–
–
–
–
–
shared
–