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IB981
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 on board.
Level
Function
IRQ 1
Standard PS/2 Keyboard
IRQ 4294967293
Intel(R) 8 Series/C220 Series PCI Express
Root Port #1 - 8C10
IRQ 4294967292
Intel(R) 8 Series/C220 Series PCI Express
Root Port #3 - 8C14
IRQ 4294967287
Intel(R) Management Engine Interface
IRQ 22
High Definition Audio Controller
IRQ 10
Intel(R) 8 Series/C220 Series SMBus
Controller - 8C22
IRQ 23
Intel(R) 8 Series/C220 Series USB EHCI
#1 - 8C26
IRQ 16
Intel(R) 8 Series/C220 Series USB EHCI
#2 - 8C2D
IRQ 13
Numeric data controller
IRQ 4
Communications Port (COM1)
IRQ 3
Communications Port (COM2)
IRQ 11
Communications Port (COM3)
IRQ 7
Communications Port (COM4)
IRQ 4294967288
Intel(R) USB 3.0 eXtensible Host Controller
- 1.0 (Microsoft)
IRQ 12
Microsoft PS/2 Mouse
IRQ 0
System timer
IRQ 54 ~ IRQ 204
Microsoft ACPI-Compliant System
IRQ 256 ~ IRQ 511
Microsoft ACPI-Compliant System
