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A buffer with single input A and single output B has a delay of 20 nanosecond. If the value of input A changes after 10 ns from 0 to 1 and it changes again from 1 to 0 at 20 ns. At what time, the value of output B will be 1, if the transport delay model is used?

A buffer with single input A and single output B has a delay of 20 nanosecond. If the value of input A changes after 10 ns from 0 to 1 and it changes again from 1 to 0 at 20 ns. At what time, the value of output B will be 1, if the transport delay model is used? Correct Answer 30 ns

In case of transport delay model, all the spikes and pulses, no matter how small, are taken into consideration i.e. not swallowed down. Transport delay order the events rather than just scheduling the last event. Therefore, when the buffer is executed at 10 ns, it will schedule a 1 at B at 30 ns. After which, it is again executed at 20 ns and hence the output will be zero again at 40 ns.

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