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Chapter 2: Hardware informationChapter 2: Hardware information
Chapter 2: Hardware informationChapter 2: Hardware information
Chapter 2: Hardware information
2.5.32.5.3
2.5.32.5.3
2.5.3
Interrupt assignmentsInterrupt assignments
Interrupt assignmentsInterrupt assignments
Interrupt assignments
Standard interrupt assignmentsStandard interrupt assignments
Standard interrupt assignmentsStandard interrupt assignments
Standard interrupt assignments
IRQIRQ
IRQIRQ
IRQ
PriorityPriority
PriorityPriority
Priority
Standard FunctionStandard Function
Standard FunctionStandard Function
Standard Function
0 1 System Timer
1 2 Keyboard Controller
2 — Re-direct to IRQ #9
3 11 Reserved
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 IRQ holder for PCI steering*
12 7 PS/2 Compatible Mouse Port*
13 8 Numeric Data Processor
14 9 Primary IDE/SATA Channel
15 10 Secondary IDE/SATA Channel
* These IRQs are usually available for ISA or PCI devices.* These IRQs are usually available for ISA or PCI devices.
* These IRQs are usually available for ISA or PCI devices.* These IRQs are usually available for ISA or PCI devices.
* These IRQs are usually available for ISA or PCI devices.
IRQ assignments for this motherboardIRQ assignments for this motherboard
IRQ assignments for this motherboardIRQ assignments for this motherboard
IRQ assignments for this motherboard
AA
AA
A
BB
BB
B
CC
CC
C
DD
DD
D
EE
EE
E
FF
FF
F
GG
GG
G
HH
HH
H
PCI slot 1 — — — — — — shared —
PCI slot 2 — — — — — — shared —
PCI slot 3 — shared — — — — — —
PCI E x16 slot shared — — — — — — —
PCI E x1 slot 1 shared — — — — — — —
PCI E x1 slot 2 — — — shared — — — —
Onboard USB controller 1 shared — — — — — — —
Onboard USB controller 2 — shared — — — — — —
Onboard USB controller 3 — — used — — — — —
Onboard USB controller 4 — — — shared — — — —
Onboard USB 2.0 controller shared — — — — — — —
Onboard IDE port shared — — — — — — —
Onboard SATA port — shared — — — — — —
Onboard Azalia audio shared — — — — — — —
Onboard LAN — shared — — — — — —
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.