User`s guide

Interrupt Request (IRQ) Lines8.3

Table 29 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 via 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

In PIC mode, the PCI bus interrupt lines can be routed to any free IRQ.

Note

If the ATA/IDE conguration is set to enhanced mode in BIOS setup (serial ATA and parallel ATA native mode operation), IRQ14 and 15 1.

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.2.