Show all of your work. Use written English, where applicable, to provide a log of your steps in solving a problem. A solution requiring physical units is incorrect if the units are omitted from the result. Underline, circle or box each result. Always write neatly.
Communication skills are essential in engineering and science.
In the logic diagram below, inputs a, b, c and d equal 1 prior to time zero. At time zero, inputs a and c are set to 0. Determine the sum of worst cases propagation delay from input to output corresponding to the transition at time zero. Do not minimize the logic function.