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2.5.3
Interrupt assignments
Standard interrupt assignments
IRQ
Priority
0
1
2
3
11
4
12
5
13
6
14
7
15
8
9
10
11
12
13
14
15
10
* These IRQs are usually available for ISA or PCI devices.
PCI Bus Number, IDSEL, and IRQ assignments
Description
IDE Controller
SATA Host Controller
SMBus Controller
USB UHCI Host controller #1
USB UHCI Host controller #2
USB UHCI Host controller #3
USB UHCI Host controller #4
USB EHCI Host controller
BCM5753A #1
BCM5753A #2
PCI slot 1
PCI slot 2
PCI E x 8 slot
PCI E x 16 slot
ASUS P5LD-MR
Standard Function
1
System Timer
2
Keyboard Controller
—
Re-direct to IRQ#9
Communications Port (COM2)*
Communications Port (COM1)*
IRQ holder for PCI steering*
Floppy Disk Controller
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
Secondary IDE Channel
INTA
PIRQC#
PIRQE#
PIRQE#
PIRQA#
PIRQG# PIRQF#
PIRQF#
PIRQA# PIRQB#
PIRQA# PIRQB#
INTB
INTC
INTD
PIRQD#
PIRQD#
PIRQF#
PIRQC#
PIRQD#
PIRQB#
PIRQE#
PIRQH#
PIRQE#
PIRQH#
PIRQG#
PIRQC#
PIRQD#
PIRQC#
PIRQD#
REQ#
GNT#
REG0#
GNT0#
REG1#
GNT1#
2-17
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