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5. Programmers Reference
5.1. Interrupts
The EUROCOM 450 uses the PC interrupts for different purposes. First there are the PC compatible interrupt sources like
timer, keyboard, EIDE, real-time clock and coprocessor. These interrupt sources require dedicated interrupt numbers,
which are fixed. Never use these interrupt numbers for other modules.
The PCI interrupts INTA, INTB, INTC and INTD are routed via the ICH to one of the ISA interrupts. The used interrupt
number must be defined in the BIOS setup menu. If not specified, the BIOS automatically sets the routing for the PCI
interrupts.
Configure by
BIOS Setup
and Drivers
IRQ 1
to
IRQ15
VGA
LAN
Carrier
PCI Slots
CPU
IRQ A
Configure by
BIOS Setup
IRQ B
IRQ C
IRQ D
IRQ 0
IRQ 1
IRQ 2
IRQ 3
PCIPCI-X
Figure 5.1: Interrupt Routing Scheme