System Resources and Maps
EBX-22 Reference Manual
71
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.
Table 37: EBX-22 IRQ Settings
z
= default setting
|
= allowed setting
IRQ
Source
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Timer 0
z
Keyboard
z
Slave PIC
z
COM1
|
z
{
{
COM2
z
|
|
|
COM3
|
|
|
|
COM4
|
|
|
|
Floppy
z
LPT1*
|
z
RTC
z
Mouse
z
Math Chip
z
IDE SATA
z
IDE PATA
z
ISA IRQ10
|
ISA IRQ3
|
ISA IRQ4
|
ISA IRQ5
|
PCI
INTA#
|
|
|
z
PCI
INTB#
|
|
|
z
PCI
INTC#
|
|
|
z
PCI
INTD#
|
z
|
|
* 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.
Table 38: PCI Interrupt Settings
z
= default setting
|
= allowed setting
PCI Interrupt
Source
INTA#
INTB#
INTC#
INTD#
Video
z
Audio
z
USB 1.1
z
USB 1.1
z
USB 1.1
z
USB 2.0
z
Ethernet0
z
Ethernet1
z
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