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2-18 Chapter 2: Hardware information
2.5.3 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 —
PCI3 — — — — — — — shared
PCIEX16_1 shared — — — — — — —
PCIEX1_1 shared — — — — — — —
PCIEX1_2 — shared — — — — — —
PCIEX1_3 — — shared — — — — —
On-board ESATA, SATA_RAID shared — — — — — — —
On-board PRI_IDE — shared — — — — — —
On-board HD Audio (ADI1988A) — — — — — — shared —
On-board GbEthernet (RTL8111B) — — — shared — — — —
USB 2.0 EHCI#1 — — — — — — — shared
USB12 OBCI#1 — — — — — — — shared
USB34 OBCI#2 — — — shared — — — —
USB56 OBCI#3 — — shared — — — — —
USB 2.0 EHCI#1 — — shared — — — — —
USB78 OBCI#4 — shared — — — — — —
USB910 OBCI#5 shared — — — — — — —
SATA1, SATA2 (ICH8) — — — shared — — — —
SATA3, SATA4 (ICH8) — — — shared — — — —