3 interrupt assignments, Standard interrupt assignments, Irq assignments for this motherboard – Asus P5GC-VM Pro User Manual
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1-22
Chapter 1: Product introduction
1.8.3
Interrupt assignments
Standard interrupt assignments
IRQ
Standard Function
0
System Timer
1
Keyboard Controller
2
Re-direct to IRQ#9
3
COM2
4
Communications Port (COM1)
5
IRQ holder for PCI steering*
6
Floppy Disk Controller
7
Printer Port (LPT1)*
8
System CMOS/Real Time Clock
9
Microsoft ACPI-Compliant system
10
IRQ holder for PCI steering*
11
IRQ holder for PCI steering*
12
PS/2 Compatible Mouse Port*
13
Numeric Data Processor
14
Primary IDE Channel
15
Slave IDE
* These IRQs are usually available for ISA or PCI devices.
IRQ assignments for this motherboard
A
B
C
D
E
F
G
H
PCI slot 1
—
—
—
—
— shared —
—
PCI slot 2
—
—
—
— shared —
—
—
PCI Express X1 slot
shared —
—
—
—
—
—
—
PCI Express x16 slot
shared —
—
—
—
—
—
—
Onboard USB controller 1
—
—
—
— shared —
—
—
Onboard USB controller 2
— shared
—
—
—
—
—
—
Onboard USB controller 3
—
—
shared —
—
—
—
—
Onboard USB controller 4
—
—
— shared —
—
—
—
Onboard USB 2.0 controller
—
—
—
— shared —
—
—
Onboard IDE controller
—
—
—
—
—
— shared —
Onboard SATA controller
—
—
—
—
—
—
— shared
Onboard SMBus controller
—
—
—
—
—
—
— shared
Onboard Azalia controller
—
—
— shared —
—
—
—
Onboard VGA
shared —
—
—
—
—
—
—
Onboare LAN 8111C
— 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.