Asus A8R32-MVP 2.5.3Interrupt assignments, Standard interrupt assignments, IRQ assignments for this motherboard

2.5.3Interrupt assignments

Standard interrupt assignments

I R Q	Priority	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.

IRQ assignments for this motherboard

	A	B	C	D	E	F	G	H
PCI slot 1	—	shared	shared	shared shared		—	—	—
PCI slot 2	—	—	shared	shared shared shared			—	—
PCI slot 3	—	—	—	shared shared shared shared				—
IEEE 1394	—	—	—	—	shared	—	—	—
PCI Express LAN (88E8053)	—	—	shared	—	—	—	—	—
PCI LAN (88E8001)	—	—	—	—	—	shared	—	—
PCI-E x1	shared shared		shared	shared	—	—	—	—
PCI-E x16_1	shared shared		shared	shared	—	—	—	—
PCI-E x16_2	shared shared		shared	shared	—	—	—	—
Onboard USB controller 1	—	shared	—	—	—	—	—	—
Onboard USB controller 2	—	—	shared	—	—	—	—	—
Onboard USB controller 3	—	—	—	shared	—	—	—	—
Onboard USB 2.0 controller	—	—	—	shared	—	—	—	—
HD audio	—	—	—	—	—	—	shared	—
Serial ATA	—	—	—	shared	—	—	—	—
Silicon Image SATA controller	—	shared	—	—	—	—	—	—

When using PCI cards on shared slots, ensure that the drivers support “Share IRQ” or that the cards do not need IRQ assignment; otherwise, conflicts will arise between the two PCI groups, making the system unstable and the card inoperable.

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