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ETX-945 User Manual 1.00 www.diamondsystems.com Page 34
5.3 Interrupt Request (IRQ) Lines
Peripheral devices use interrupt request lines to notify CPU when services are required. The table below lists the
interrupt request channels used by the ETX-945’s onboard devices.
IRQ Level
Function
IRQ 01
Standard 0 / 02-Key or Microsoft Natural PS/2 Keyboard
IRQ 03
Communications Port
IRQ04
Communications Port
IRQ 08
System CMOS/real time clock
IRQ 09
Microsoft ACPI-Compliant System
IRQ 10
Communications Port
IRQ 11
Communications Port
IRQ 12
PS/2 Compatible Mouse
IRQ 13
Math Coprocessor
IRQ 14
Primary IDE Channel
IRQ 15
Intel 8280 G (ICH7 Family) SMBus Controller - 27DA
IRQ 16
Intel 8280 G (ICH7 Family PCI Express Root Port - 27D0
IRQ 16
Intel 8280 G (ICH7 Family) USB Universal Host Controller - 27CB
IRQ 16
Mobile Intel 94 GM Express Chipset Family
IRQ 17
Realtek AC’97 Audio
IRQ 18
Intel 8280 G (ICH7 Family) PCI Express Root Port - 27D4
IRQ 18
Intel 8280 G (ICH7 Family) USB Universal Host Controller - 27CA
IRQ 19
Intel 8280 G (ICH7 Family) USB Universal Host Controller - 27C9
IRQ 19
Intel 8280 G (ICH7-M Family) Serial ATA Storage Controller - 27C4
IRQ 19
Intel 8280 G (ICH7 Family) USB Universal Host Controller - 27C9
IRQ 20
Intel PRO/ 00 VE Network Connection
IRQ 23
Intel 8280 G (ICH7 Family) USB Universal Host Controller - 27C8
IRQ 23
Intel 8280 G (ICH7 Family) USB2 Enhanced Host Controller - 27CC