B. interrupt request lines (irq) – IBASE IB550 User Manual
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APPENDIX
IB550F User’s Manual
51
B. Interrupt Request Lines (IRQ)
Peripheral devices use interrupt request lines to notify CPU for the service
required. The following table shows the IRQ used by the devices on
board.
Level
Function
IRQ 0
System timer
IRQ 1
PC/AT Enhanced PS/2 Keyboard (101/102-Key)
IRQ 3
Communications Port (COM2)
IRQ 4
Communications Port (COM1)
IRQ 5
Advanced Micro Devices Win XP Graphics Driver
IRQ 5
Geode LX AES Crypto Driver
IRQ 5
Silicon Image SiI 3512 SATALink Controller
IRQ 5
Realtek RTL8139/810x Family Fast Ethernet NIC
IRQ 5
GeodeLX Audio Driver (WDM)
IRQ 5
Standard OpenHCD USB Host Controller
IRQ 5
Standard Enhanced PCI to USB Host Controller
IRQ 8
System CMOS/real time clock
IRQ 10
Communications Port (COM4)
IRQ 11
Communications Port (COM3)
IRQ 12
Microsoft PS/2 Mouse
IRQ 13
Numeric data processor
IRQ 14
Primary IDE Channel