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1-24 Chapter 1: Product introduction
1.8.3 Interrupt assignments
Standard interrupt assignments
IRQ Priority Standard Function
0 1 System Timer
1 2 Keyboard Controller
2 — Re-direct to IRQ#9
3 12 IRQ holder for PCI steering*
4 13 Communications Port (COM1)*
5 14 IRQ holder for PCI steering*
6 15 Floppy Disk Controller
7 16 Printer Port (LPT1)*
8 3 System CMOS/Real Time Clock
9 4 ACPI*
10 5 SMBus Controller*
11 6 IRQ holder for PCI steering*
12 7 PS/2 Compatible Mouse Port*
13 8 Numeric Data Processor
14 9 IDEIRQ (legacy mode, combined mapped as primary),
SMasterATA1 (Master), SATA3 (Secondary)
15 10 IDEIRQ (legacy mode, combined mapped as secondary),
SATA2 (Master), SATA4 (Secondary)
* These IRQs are usually available for PCI devices.
IRQ assignments for this motherboard
A B C D E F G H
PCI1 shared — — — — — — —
PCI2 — shared — — — — — —
PCIEX16_1 shared — — — — — — —
PCIEX4_1 shared — — — — — — —
On-board ESATA, SATA_RAID shared — — — — — — —
On-board PRI_IDE shared — — — — — — —
On-board HD Audio (AD1988) — — — — — — shared —
On-board GbEthernet (RTL8111B) — shared — — — — — —
USB 2.0 EHCI#1 — — — — — — — shared
USB 2.0 EHCI#2 — — — — — — shared —
USB12 UHCI#1 — — — — — — — shared
USB34 UHCI#2 — — — shared — — — —
USB56 UHCI#3 — — shared — — — — —
USB78 UHCI#4 shared — — — — — — —
USB910 UHCI#5 shared — — — — — — —
SATA1, SATA2 (ICH8) — — shared — — — — —
SATA3, SATA4 (ICH8) — — — shared — — — —