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6.4. Interrupt Request (IRQ) Lines

PIC Mode

IRQ# Typical Intterupt Resource Connected to Pin Available

0 Counter 0 N/A No

1 Keyboard controller IRQ1 vis SEIRQ No

2 Cascade interrupt from slave PIC N/A No

3 Serial Port 2 (COM2) / PCI IRQ3 via SERIRQ / PIRQ Note (1)

4 Serial Port 1 (COM1) / PCI IRQ4 via SERIRQ / PIRQ Note (1)

5 Generic IRQ5 via SERIRQ / PIRQ Note (1)

6 Floppy Drive Controller IRQ6 via SERIRQ / PIRQ No

7 Generic IRQ7 via SERIRQ / PIRQ Note (1)

8 Real-time clock N/A No

9 Generic IRQ9 via SERIRQ / PIRQ Note (1)

10 Generic IRQ10 via SERIRQ / PIRQ Note (1)

11 Generic IRQ11 via SERIRQ / PIRQ Note (1)

12 PS/2 Mouse IRQ12 via SERIRQ / PIRQ Note (1)

13 Math Processor N/A No

14 Generic IRQ14 via SERIRQ / PIRQ Note (1)

15 Generic IRQ15 via SERIRQ / PIRQ Note (1)

Note (1): These IRQs can be used for PCI devices when onboard device is disabled.

APIC Mode

IRQ# Typical Intterupt Resource Connected to Pin Available

0 Counter 0 N/A No

1 Keyboard controller N/A No

2 Cascade interrupt from slave PIC N/A No

3 Serial Port 2 (COM2) / PCI IRQ3 via SERIRQ / PIRQ Note (1)

4 Serial Port 1 (COM1) / PCI IRQ4 via SERIRQ / PIRQ Note (1)

5 Generic IRQ5 via SERIRQ / PIRQ Note (1)

6 Floppy Drive Controller IRQ6 via SERIRQ / PIRQ No

7 Generic IRQ7 via SERIRQ / PIRQ Note (1)

8 Real-time clock N/A No

9 Generic IRQ9 via SERIRQ / PIRQ Note (1)

10 PCI IRQ10 via SERIRQ / PIRQ Note (1)

11 Ethernet Controller/SMBus

Controller /ME/USB Controller

IRQ11 via SERIRQ / PIRQ Note (1)

12 PS/2 Mouse IRQ12 via SERIRQ / PIRQ Note (1)

13 Math Processor N/A No

14 Generic IRQ14 via SERIRQ / PIRQ Note (1)

15 Generic IRQ15 via SERIRQ / PIRQ Note (1)

16 N/A PCIE Port 0/1/2/3/4/5/6 UHCI Controller, xHCI Controller P.E.G Root

Port, I.G.D

Note (1)

17 N/A PCIE Port 0/1/2/3/4/5/6, P.E.G Root Port, Note (1)

18 N/A PCIE Port 0/1/2/3/4/5/6 UHCI Controller, P.E.G Root Port, SATA Host

controller, SMBus Controller, Thermal Controller, EHCI Controller

Note (1)

19 N/A PCIE Port 0/1/2/3/4/5/6 UHCI Controller, P.E.G Root Port, SATA Host

controller, SATA Host controller

Note (1)

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