Interrupts
The interrupt routing for standard components such as COM1/2 is in
compliance with standard PC/AT systems. Unused interrupts can be used for
add-on cards or other board specific PCI devices such as SCSI and Ethernet.
Table 20: Interrupt assignments
Hardware IRQ
IRQ Source
INTC1
IRQ00
System Timer
IRQ01
Keyboard
a
IRQ02
Cascade from INTC2
IRQ03
COM2 / COM1
b
IRQ04
COM1 / COM2
b
IRQ05
IRQ06
IRQ07
INTC2
IRQ08
Real Time Clock
IRQ09
Power Management Contr.
IRQ10
PnP/PCI
b
IRQ11
PnP/PCI
b
IRQ12
PS/2 Mouse
a
IRQ13
Numeric Coprocessor
IRQ14
External IDE
d
IRQ15
Onboard IDE
e
NMI Parity
Error,
ECC Error,
System Error
a
. Emulated interrupt from USB keyboard/mouse.
b
. Interrupts are available for Plug and Play PCI devices
d
. This interrupt is available for other devices when the primary IDE is disabled
in SETUP or when IDE is configured to 'native PCI' mode.
e
. This interrupt is available when the secondary IDE is disabled in SETUP or
when IDE is configured to 'native PCI' mode.
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