Asus P5SD2-FM manual Interrupt assignments, Standard interrupt assignments

1.5.3Interrupt assignments

Standard interrupt assignments

IRQ	Priority	Standard Function
0	1	System Timer
1	2	Keyboard Controller
2	-	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 (LPT)*
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.

The communications port (COM2) is an optional item.

IRQ assignments for this motherboard

	A	B	C	D	E	F	G	H
PCI slot 1	shared	—	—	—	—	—	—	—
PCI slot 2	—	shared	—	—	—	—	—	—
PCI slot 3	—	—	shared	—	—	—	—	—
PCI Express x16 slot	—	—	—	shared	—	—	—	—
Onboard USB 1.1 controller 0	—	—	—	—	used	—	—	—
Onboard USB 1.1 controller 1	—	—	—	—	—	used	—	—
Onboard USB 1.1 controller 2	—	—	—	—	—	—	used	—
Onboard USB 2.0 controller	—	—	—	—	—	—	—	used
Onboard Audio	—	—	shared	—	—	—	—	—
Onboard IDE Controller	shared	—	—	—	—	—	—	—
Onboard SATA Controller	—	shared	—	—	—	—	—	—
Onboard LAN	—	—	—	shared	—	—	—	—
Onboard IEEE 1394a controller	—	—	shared	—	—	—	—	—
Onboard modem	—	—	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.

ASUS P5SD2-FM 1-17