Intel 630 - Pentium 4 630 3.0GHz 800MHz 2MB Socket 775 CPU - Assigning IRQs for Expansion Cards; Interrupt Request Table

16
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 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 slot 1

Shared
 
PCI slot 2
 
Shared

PCI slot 3
  
Shared
Onboard VGA
   
AC97/MC97

Shared
 
Onboard USB
  
Shared
Onboard USB 2
  
Shared
LAN
(for 630TCF Only)
 
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.