13
Some expansion cards need an IRQ to operate. Generally, an IRQ must exclusively
assign to one use. In a standard design, there are 16 IRQs available but most of them
are already in use.
Standard Interrupt Assignments
IRQ Priority
Standard
function
0 1
System
Timer
1 2
Keyboard
Controller
2 N/A
Programmable
Interrupt
3 *
11
Communications Port (COM2)
4 *
12
Communications Port (COM1)
5 *
13
Sound Card (sometimes LPT2)
6
14
Floppy Disk Controller
7 *
15
Printer Port (LPT1)
8
3
System CMOS/Real Time Clock
9 *
4
ACPI Mode when enabled
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.
2-5-3 Interrupt Request Table For This Motherboard
Interrupt request are shared as shown the table below:
INT A
INT B
INT C
INT D
PCI slot1
Not Shared
PCI slot2
Shared
PCI slot3
Not
Shared
Onboard LAN
Shared
Onboard VGA
AC97/MC97
Shared
Onboard USB
Shared
IMPORTANT!
If using PCI cards on shared slots, make sure that the drivers support
“Shared IRQ” or that the cards don’t need IRQ assignments. Conflicts will
arise between the two PCI groups that will make the system unstable or
cards inoperable.
2-6 Connectors, Headers
