VULCAN Technical Manual
Detailed hardware description
© 2007 Eurotech Ltd Issue D
29
Interrupt assignments
Internal interrupts
For details about the IXP425 interrupt controller and internal peripheral interrupts, refer
to the Intel IXP425 developer’s manual, which is on the Development Kit CD.
External interrupts
The following table lists the IXP425 signal pins used for external interrupt inputs:
IXP425 pin
Signal
Active
Peripheral
GPIO 2
USB_INTA#
Low
USB controller
GPIO 3
CF_INTB#
Low
CF controller
GPIO 4
UART_IRQ#
Low
UART
GPIO 5
ISA_IRQ3
Rising edge
PC/104
GPIO 6
ISA_IRQ4
Rising edge
PC/104
GPIO 7
ISA_IRQ5
Rising edge
PC/104
GPIO 8
ISA_IRQ6
Rising edge
PC/104
GPIO 9
ISA_IRQ7
Rising edge
PC/104
GPIO 10
ISA_IRQ10
Rising edge
PC/104
GPIO 11
ISA_IRQ11
Rising edge
PC/104
GPIO 12
ISA_IRQ12
Rising edge
PC/104