Interrupt Acknowledgement :
1. Interrupt
requests are assumed to remain asserted until reset by instructions
in the service routine. But this is not the most efficient technique.
2. Until
a request is de-asserted it is not possible for another request to be
seen.This may result in data from a fast peripheral being lost while
service routine is getting around to clearing a low priority interrupt.
3. It
could be better if the request could be cleared quickly after the request
is noticed.
4. To
assists in this most computers have a signal (Interrupt Acknowledgement,
IACK) generated by the CPU that is returned to the
peripheral as soon as the interrupt is detected.
5. This
clears the interrupt request from that device and allows other devices to use the interrupt line
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