ADLINK PCI-8554 - Manual (Page 48)

38 • Signal Connection and Applications
4.8 Dual Interrupt System
The cPCI/PCI-8554/R provides a dual interrupt source (one internal plus
one external), which can be very useful in some applications. For example,
most applications require a watchdog timer to monitor the system
periodically; hence, an IRQ channel is used. An emergency control may
also be necessary; therefore the external IRQ channel will come in handy.
Figure 25: Example of dual interrupt system