Chapter 3 Signals and Pinout Tables
48 Reference Manual COM830
Interrupt Request (IRQ) Lines
In PIC mode, the PCI bus interrupt lines can be routed to any free IRQ.
Table 3-27. IRQ Lines in PIC mode
IRQ# Available Typical Interrupt Source Connected to Pin
0 No Counter 0 Not applicable
1 No Keyboard Not applicable
2 No Cascade Interrupt from Slave PIC Not applicable
3 Yes IRQ3 via SERIRQ or PCI BUS INTx
4 Yes IRQ4 via SERIRQ or PCI BUS INTx
5 Yes IRQ5 via SERIRQ or PCI BUS INTx
6 Yes IRQ6 via SERIRQ or PCI BUS INTx
7 Yes IRQ7 via SERIRQ or PCI BUS INTx
8 No Real-time Clock Not applicable
9 Note 2 SCI / Generic IRQ9 via SERIRQ or PCI BUS INTx
10 Yes IRQ10 via SERIRQ or PCI BUS INTx
11 Yes IRQ11 vi a SERIRQ or PCI BUS INTx
12 Yes IRQ12 via SERIRQ or PCI BUS INTx
13 No Math processor Not applicable
14 Note 1 IDE Controller 0 (IDE0) / Generic IRQ14 or PCI BUS INTx
15 Note 1 IDE Controller 1 (IDE1) / Generic IRQ15 or PCI BUS INTx
NOTE If the ATA/IDE configuration is set to enhanced mode in BIOS setup (serial ATA
and parallel ATA native mode operation), IRQ14 and 15 are free for PCI/LPC
bus.
In ACPI mode, IRQ9 is used for the SCI (System Control Interrupt). The SCI can
be shared with a PCI interrupt line.
Table 3-28. IRQ Lines in APIC mode
IRQ# Available Typical Interrupt Source Connected to Pin / Function
0 No Counter 0 Not applicable
1 No Keyboard Not applicable
2 No Cascade Interrupt from Slave
PIC Not applicable
3 Yes IRQ3 via SERIRQ
4 Yes IRQ4 via SERIRQ
5 Yes IRQ5 via SERIRQ
6 Yes IRQ6 via SERIRQ
7 Yes IRQ7 via SERIRQ
8 No Real-time Clock Not applicable