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2-5-2 Assigning IRQs For Expansion Card
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
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.
2-5-3 Interrupt Request Table For This Motherboard
Interrupt request are shared as shown the table below:
PCI slot 1
PCI slot 2
PCI slot 3
Onboard VGA
AC97/MC97
Onboard USB
Onboard USB 2
LAN (for 635CS Only)
IMPORTANT! If using PCI cards on shared slots, make sure that the drivers
1
System Timer
2
Keyboard Controller
N/A
Programmable Interrupt
11
Communications Port (COM2)
12
Communications Port (COM1)
13
Sound Card (sometimes LPT2)
14
Floppy Disk Controller
15
Printer Port (LPT1)
3
System CMOS/Real Time Clock
4
ACPI Mode when enabled
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
INT A
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.
Standard function
INT B
INT C
Shared
Shared
Shared
Shared
16
INT D
Shared
Shared
Shared
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