User’s Manual
136 ECM-3610/3610L User’s Manual
Interrupt Usage
The onboard VIA VT82C686B provides an ISA compatible interrupt controller with
functionality as two 8259A interrupt controllers. The two controllers are cascaded to
provide 13 external interrupts. Most of them is used by onboard devices, but a few of them
can be available through the PC/104 interface by disabling some onboard devices.
The actual interrupt settings depend on the PnP handler, the table below indicates the
typical settings.
Interrupt
Description Note
IRQ0 System timer
IRQ1 Standard 101/102-Key or Microsoft Natural Keyboard
IRQ2 Programmable interrupt controller
IRQ3 Communications Port (COM2) 1
IRQ4 Communications Port (COM1) 1
IRQ5 ACPI IRQ Holder for PCI IRQ Steering
IRQ5 S3 Graphics Twister 2
IRQ6 Standard Floppy Disk Controller 1
IRQ7 Printer Port (LPT1) 1
IRQ8 System CMOS/real time clock
IRQ9 SCI IRQ used by ACPI bus
IRQ10 VIA AC'97 Audio Controller (WDM) 2
IRQ10 Realtek RTL8139/810X Family PCI Fast Ethernet NIC 2
IRQ10 ACPI IRQ Holder for PCI IRQ Steering
IRQ11 ACPI IRQ Holder for PCI IRQ Steering
IRQ11 VIA Tech 3038 PCI to USB Universal Host Controller 2
IRQ11 ACPI IRQ Holder for PCI IRQ Steering
IRQ11 VIA Tech 3038 PCI to USB Universal Host Controller 2
IRQ12 PS/2 Compatible Mouse Port
IRQ13 Numeric data processor
IRQ14 VIA Bus Master PCI IDE Controller
IRQ14 Primary IDE controller (dual fifo)
IRQ15 VIA Bus Master PCI IDE Controller
IRQ15 Secondary IDE controller (dual fifo)
Note:
1. The usage of these interrupts depends on the choices made in the Evalue setup
screen. The interrupts are fully useable for PC/104 interface if the corresponding
on-board unit is disabled in the BIOS setup.
2. These interrupt lines are managed by the PnP handler and are subject to change
during system initialisation.
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