2.5.3Interrupt assignments
Standard interrupt assignments
IRQ | Priority | Standard function |
0 | 1 | System Timer |
1 | 2 | Keyboard Controller |
2 | – | Redirect to IRQ#9 |
3 | 11 | Reserved |
4 | 12 | Reserved |
5 | 13 | IRQ Holder for PCI Steering* |
6 | 14 | Floppy Disk Controller |
7 | 15 | IRQ Holder for PCI Steering* |
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 | Reserved |
13 | 8 | Numeric Data Processor |
14 | 9 | Primary IDE Channel |
* These IRQs are usually available for ISA or PCI devices.
IRQ assignments for this motherboard
| A | B | C | D | E | F | G | H |
PCIE x16_1 | shared | shared | shared | shared | – | – | – | – |
USB 1.0 controller 1 | – | – | – | shared | – | – | – | – |
USB 1.0 controller 2 | – | – | – | shared | – | – | – | – |
USB 1.0 controller 3 | – | – | – | shared | – | – | – | – |
USB 1.0 controller 4 | – | – | – | shared | – | – | – | – |
USB 2.0 controller | – | – | – | shared | – | – | – | – |
HD audio | shared | – | – | – | – | – | – | – |
Chapter 2: Hardware information |