User`s guide

Table 31 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 No Reserved for BIOS purposes

8 No Real-time Clock Not applicable

9 No SCI SCI

10 Yes IRQ10 via SERIRQ

11 Yes IRQ11 via SERIRQ

12 Yes IRQ12 via SERIRQ

13 No Math processor Not applicable

14 Yes

15 Yes

16 No PIRQA, Integrated VGA Controller, UHCI Controller #3, PCI Express Root Port 0, PCI Express Port 0, PCI Express

Port 1, PCI Express Port 3

17 No PIRQB, PCI Express Root Port 0, PCI Express Port 0, PCI Express Port 1, PCI Express Port 3

18 No PIRQC, UHCI Controller #2, PCI Express Root Port 0, PCI Express Port 0, PCI Express Port 1, PCI Express Port 3,

Jmicron PATA Controller

19 No PIRQD, PCI Express Root Port 0, PCI Express Port 0, PCI Express Port 1, PCI Express Port 3, SMBUS Controller,

UHCI Controller #1

20 Yes PIRQE, onboard Gigabit LAN Controller, COMx Slot #0, COMx Slot #1, COMx Slot #2, COMx Slot #3

21 Yes PIRQF, COMx Slot #0, COMx Slot #1, COMx Slot #2, COMx Slot #3

22 Yes PIRQG, Intel High Denition Audio Controller, COMx Slot #0, COMx Slot #1, COMx Slot #2, COMx Slot #3

23 Yes PIRQH, EHCI Host Controller #1, UHCI Controller #0, COMx Slot #0, COMx Slot #1, COMx Slot #2, COMx Slot #3

Note

In APIC mode, the PCI bus interrupt lines are connected with IRQ 16, 17, 18 and 19.