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Interrupt Configuration
The EBX-22 has the standard complement of PC type interrupts. Four non-shared interrupts are
routed to the PC/104 bus, and up to four IRQ lines can be allocated as needed to PCI devices. The
following tables show the default and allowed interrupt settings. There are no interrupt
configuration jumpers. All configuration is handled through CMOS Setup. If your design needs
to use interrupt lines on the PC/104 bus, IRQ5 and IRQ10 are recommended. (IRQ3 and IRQ4 are
normally used by COM ports on the main board.) COM ports can share interrupts with other
COM ports, but not with other devices.
= default setting
Source
0
Timer 0
Keyboard
Slave PIC
COM1
COM2
COM3
COM4
Floppy
LPT1*
RTC
Mouse
Math Chip
IDE SATA
IDE PATA
ISA IRQ10
ISA IRQ3
ISA IRQ4
ISA IRQ5
PCI INTA#
PCI INTB#
PCI INTC#
PCI INTD#
* When LPT1 is in floppy disk mode, the pins change function, the LPT device is no
longer available, and the floppy disk controller uses IRQ 6.
EBX-22 Reference Manual
Table 37: EBX-22 IRQ Settings
= allowed setting
1
2
3
4
5
6
Table 38: PCI Interrupt Settings
= default setting
PCI Interrupt
Source
INTA#
INTB#
Video
Audio
USB 1.1
USB 1.1
USB 1.1
USB 2.0
Ethernet0
Ethernet1
System Resources and Maps
IRQ
7
8
9
10
11
= allowed setting
INTC#
INTD#
12
13
14
15
71
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