Ampro Corporation COM 830 manual Interrupt Request IRQ Lines, Pic

Chapter 3Signals and Pinout Tables

Interrupt Request (IRQ) Lines

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 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 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	Not applicable
		PIC
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

48 Reference Manual COM 830