I'm looking over the following question:
I have the answer, and for the most part, I think I understand the logic: y = z' and z = xy. There's a 15ns delay (10 from the AND gate and 5 from the inverter) when coming back around to z. But my question has to do with Z on the timing diagram:
First, how do we know when Z starts? It looks like it goes from 0 to 1 10 ns after x does, but why? Is that all there is to it? Also, what is determining when z goes from 0 to 1 (with the 15 ns delay, I guess)? I really hope my questions make sense and that someone can clarify what is going on in the diagram for me -- I'm sure I've overlooked something in the circuit.