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