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2-16 Chapter 2: Hardware information
2.5.3 Interrupt assi gnments
IRQ Priority Standard Function
0 1 System Timer
1 2 Keyboard Controller
2 — Re-direct to IRQ#9
3* 11 Communications Port (COM2)
4* 12 Communications Port (COM1)
5* 13 IRQ holder for PCI steering
6 14 Floppy Disk Controller
7* 15 Printer Port (LPT1)
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 PS/2 Compatible Mouse Port
13 8 Numeric Data Processor
14 9 Primary IDE Channel
15 10 Secondary IDE Channel
* These IRQs are usually available for ISA or PCI devices.
Description INTA INTB INTC INTD REQ# GNT#
PATA Controller PIRQA# — — — — —
SATA Controller PIRQD# — — — — —
SMBus Controller PIRQB# — — — —
USB1 UHCI Controller #1 PIRQH# — — — —
USB1 UHCI Controller #2 PIRQD# — — — — —
USB 2.0 EHCI Controller PIRQH# — — — — —
BMC5721 #1 PIRQA# — — — — —
BMC5721 #2 PIRQB# — — — — —
ATI RAGE XL PIRQD# — — — REQ1# GNT1#
Adaptec 7901 PXIRQ2 — — — PXREQ2 PXGNT2
PCI Express Slot 1 (x16) PIRQA# — — — — —
PCIX Slot 2 (64-bit) PXIRQ0 PXIRQ1 PXIRQ2 PXIRQ3 PXREQ0 PXGNT0
PCIX Slot 3 (64-bit) PXIRQ4 PXIRQ5 PXIRQ6 PXIRQ7 PXREQ1 PXGNT1
PCI Slot 4 (32-bit) PIRQE# PIRQF# PIRQG# PIRQH# REQ0# GNT0#
Standard interrupt assignments
PCI Bus Number, IDSEL, and IRQ assignments