1-22
Chapter 1: Product introduction
1.8.3
Interrupt assignments
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.
* These IRQs are usually available for ISA or PCI devices.
IRQ assignments for this motherboard
A
B
C
D
PCI slot 1
–
shared
–
–
PCI slot 2
–
–
shared
–
PCI slot 3
–
–
–
shared
PCI slot 4
shared
–
–
–
PCIe x16 slot
Fixed Fixed Fixed Fixed
Onboard USB controller 1 shared
–
–
–
Onboard USB controller 2
–
shared
–
–
Onboard USB controller 3
–
–
shared
–
Onboard USB controller 4
–
–
–
shared
Onboard USB 2.0 contoller
–
–
shared
–
Onboard LAN
shared
–
–
–
Onboard audio
–
shared
–
–
IRQ
Priority Standard function
0
1
System Timer
1
2
Keyboard Controller
2
–
Redirect to IRQ#9
4
12
Communications Port (COM1)*
5
13
IRQ Holder for PCI Steering*
6
14
Floppy Disk Controller
7
15
Printer Port (LPT1)*
8
3
System CMOS/Real Time Clock
9
4
IRQ Holder for PCI Steering*
10
5
IRQ Holder for PCI Steering*
11
6
PCI-E x16
12
7
PS/2 Compatible Mouse Port*
13
8
Numeric Data Processor
14
9
Primary IDE Channel
15
10
Secondary IDE Channel
