Can you explain the Daisy Chaining method for priority interrupt?
Answers
Answer:
The daisy-chaining method involves connecting all the devices that can request an interrupt in a serial manner. This configuration is governed by the priority of the devices. The device with the highest priority is placed first followed by the second highest priority device and so on.
Explanation:
To summarize, when I/O devices are ready for I/O transfer, they generate an interrupt request signal to the computer. The CPU receives this signal, suspends the current instructions it is executing and then moves forward to service that transfer request. But what if multiple devices generate interrupts simultaneously. In that case, we have to have a way to decide which interrupt is to be serviced first. In other words, we have to set a priority among all the devices for systemic interrupt servicing.