1.8.3Interrupt assignments
Standard interrupt assignments
IRQ | Priority | Standard Function |
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0 | 1 | System Timer |
1 | 2 | Keyboard Controller |
2 | — | |
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), |
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| SMasterATA1 (Master), SATA3 (Secondary) |
15 | 10 | IDEIRQ (legacy mode, combined mapped as secondary), |
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| SATA2 (Master), SATA4 (Secondary) |
* These IRQs are usually available for PCI devices.
IRQ assignments for this motherboard |
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| A | B | C | D | E | F | G | H |
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PCI1 | shared | — | — | — | — | — | — | — |
PCI2 | — | shared | — | — | — | — | — | — |
PCIEX16_1 | shared | — | — | — | — | — | — | — |
PCIEX4_1 | shared | — | — | — | — | — | — | |
shared | — | — | — | — | — | — | — | |
shared | — | — | — | — | — | — | — | |
— | — | — | — | — | — | shared | — | |
— | 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 | — | — | — | — |
Chapter 1: Product introduction |