Appendix
EC5-1812CLDNA(B)
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IRQ Assignment Table
There are 11 interrupt sources in the EC5-1812CLDNA serial interrupt controllers and
APIC interrupt controllers, which are compatible with ISA interrupt controllers. Some
are occupied by the system device. Only the ones which are not occupied can be
distributed. The ISA devices claim to engross the interrupt. Only the plug and play
ISA devices can be distributed by the BIOS or the OS. PCI devices use APIC interrupt
and are distributed by OS. The diagram below shows the interrupt distribution
compatible with ISA:
Level
Function
IRQ0
System Timer
IRQ3
Serial Port #3, #4
IRQ4
Serial Port #1, #2
IRQ8
System CMOS/Real Time Clock
IRQ9
ACPI Adaptation System
IRQ13
Numeric Data Processor
IRQ14
Master IDE
IRQ15
Slave IDE
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