Asus P5CR-VM 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	Ñ	Re-direct to IRQ #9
3	11	Communications Port (COM2)*
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 Channel
15	10	Secondary IDE 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	Ñ	Ñ	Ñ	Ñ	shared	Ñ	Ñ	Ñ
PCI slot 2	Ñ	Ñ	Ñ	Ñ	Ñ	Ñ	shared	Ñ
PCI E x8 slot	shared	Ñ	Ñ	Ñ	Ñ	Ñ	Ñ	Ñ
PCI E x1 slot	shared	Ñ	Ñ	Ñ	Ñ	Ñ	Ñ	Ñ
Onboard USB controller 1	shared	Ñ	Ñ	Ñ	Ñ	Ñ	Ñ	Ñ
Onboard USB controller 2	Ñ	shared	Ñ	Ñ	Ñ	Ñ	Ñ	Ñ
Onboard USB controller 3	Ñ	Ñ	used	Ñ	Ñ	Ñ	Ñ	Ñ
Onboard USB controller 4	Ñ	Ñ	Ñ	shared	Ñ	Ñ	Ñ	Ñ
Onboard USB 2.0 controller	shared	Ñ	Ñ	Ñ	Ñ	Ñ	Ñ	Ñ
Onboard IDE port	shared	Ñ	Ñ	Ñ	Ñ	Ñ	Ñ	Ñ
Onboard SATA port	Ñ	shared	Ñ	Ñ	Ñ	Ñ	Ñ	Ñ
Onboard PCI E x1 LAN1	Ñ	shared	Ñ	Ñ	Ñ	Ñ	Ñ	Ñ
Onboard PCI E x1 LAN2	Ñ	Ñ	shared	Ñ	Ñ	Ñ	Ñ	Ñ

When using PCI cards on shared slots, ensure that the drivers support ÒShare IRQÓ 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.

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