Appendix B
RUBY-9715VG2AR User’s Manual
Interrupt Request Lines (IRQ)
Peripheral devices can use interrupt request lines to notify CPU for the service
required. The following table shows the IRQ used by the devices on board.
IRQ# Current Use Default Use
IRQ 0 SMARTDRV System Timer
IRQ 1 SMARTDRV Keyboard Event
IRQ 2 [Unassigned] Usable IRQ
IRQ 3 System ROM COM 2
IRQ 4 System ROM COM 1
IRQ 5 PCI Device USB 2.0 EHCI Controller
IRQ 6 System ROM Diskette Event
IRQ 6 System ROM Floppy Disk Controller
IRQ 7 System ROM Parallel Port
IRQ 8 System ROM Real-Time Clock
IRQ 9 System ROM ACPI Controller
IRQ 9 System ROM USB 1.0/1.1 UHCI Controller
IRQ 11 System ROM Display Controller
IRQ 11 PCI Device Network Controller
IRQ 11 System ROM USB 1.0/1.1 UHCI Controller
IRQ 12 System ROM IBM Mouse Event
IRQ 13 System ROM Coprocessor Error
IRQ 14 System ROM Hard Disk Event
IRQ 15 System ROM SMBus Controller
IRQ 15 PCI Device Multimedia Device
IRQ 15 PCI Device Network Controller
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