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APPENDIX
46
IB895 User’s Manual
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.
Level
Function
IRQ 0
System timer
IRQ 1
Standard PS/2 Keyboard
IRQ 3
Communications Port (COM2)
IRQ 4
Communications Port (COM1)
IRQ 5
Communications Port (COM3)
IRQ 7
Communications Port (COM4)
IRQ 8
System CMOS/real time clock
IRQ 11
Intel(R) N10/ICH7 Family SMBus Controller -
27DA
IRQ 12
Microsoft PS/2 Mouse
IRQ 13
Numeric data processor
IRQ 16
Intel(R) N10/ICH7 Family USB Universal Host
Controller - 27CB
IRQ 18
Intel(R) N10/ICH7 Family USB Universal Host
Controller - 27CA
IRQ 19
Intel(R) N10/ICH7 Family Serial ATA Storage
Controller - 27C0
IRQ 19
Intel(R) N10/ICH7 Family USB Universal Host
Controller - 27C9
IRQ 22
High Definition Audio Controller
IRQ 23
Intel(R) N10/ICH7 Family USB2 Enhanced Host
Controller - 27CC
IRQ 23
Intel(R) N10/ICH7 Family USB Universal Host
Controller - 27C8
IRQ 4294967290
Intel(R) 82583V Gigabit Network Connection
IRQ 4294967291
Intel(R) 82583V Gigabit Network Connection #2
IRQ 4294967292
Intel(R) Graphics Media Accelerator 3600 Series
IRQ 4294967293
Intel(R) N10/ICH7 Family PCI Express Root Port -
27D2
IRQ 4294967294
Intel(R) N10/ICH7 Family PCI Express Root Port -
27D0