2.5.3Interrupt assignments
Standard interrupt assignments
| I R Q | Priority | Standard Function |
| 0 | 1 | System Timer |
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| 1 | 2 | Keyboard Controller |
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| 2 | — | |
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| 3 | 11 | Communications Port (COM2)* |
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| 4 | 12 | Communications Port (COM1)* |
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| 5 | 13 | IRQ holder for PCI steering* |
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| 6 | 14 | Floppy Disk Controller |
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| 7 | 15 | Printer Port (LPT1)* |
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| 8 | 3 | System CMOS/Real Time Clock |
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| 9 | 4 | IRQ holder for PCI steering* |
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| 10 | 5 | IRQ holder for PCI steering* |
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| 11 | 6 | IRQ holder for PCI steering* |
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| 12 | 7 | PS/2 Compatible Mouse Port* |
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| 13 | 8 | Numeric Data Processor |
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| 14 | 9 | Primary IDE Channel |
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| 15 | 10 | Secondary IDE Channel |
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* These IRQs are usually available for ISA or PCI devices.
PCI Bus Number, IDSEL, and IRQ assignments
| D e s c r i p t i o n | I N T A | I N T B | I N T C | I N T D | R E Q # | G N T # |
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| IDE Controller | PIRQC# |
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| SATA Controller | PIRQC# |
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| SMBus Controller | PIRQB# |
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| USB UHCI Controller #1 | PIRQA# |
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| USB UHCI Controller #2 | PIRQD# |
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| USB 2.0 EHCI Controller | PIRQH# |
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| AIC7901 SCSI controller |
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| PXIRQ2# |
| X_REQ3# | X_GNT3# |
| ATI RAGE XL | PIRQB# |
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| REQ2# | GNT2# |
| PCIX Slot 1 | PXIRQ0# | PXIRQ1# | PXIRQ2# | PXIRQ3# X_IRQ0# X_IRQ0# | ||
| PCIX Slot 2 | PXIRQ3# | PXIRQ1# | PXIRQ0# | PXIRQ2# | X_IRQ1# | X_IRQ1# |
| PCI Express Slot3 |
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| PCIX Slot 4 | PIRQE# | PIRQF# | PIRQG# | PIRQH# | REQ0# | GNT0# |
| PCIX Slot 5 | PIRQG# | PIRQH# | PIRQE# | PIRQF# | REQ1# | GNT1# |
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2 - 18 | Chapter 2: Hardware information |