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ASUS P5SD2-FM 1-17
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.
IRQ assignments for this motherboard
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.
AB CDEFGH
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 — — — — —
1.5.3 Interrupt assignments
The communications port (COM2) is an optional item.