Question

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1. Which of the following circuits are synchronous sequential circuits? Explain. CLK CLK CLK 2. Design an elevator controller for a building with 5 floors. This elevator only moves one floor at a time and only has inputs UP and DOWN. It produces an output indicating the floor the elevator is currently on. How many bits of state should you use? Draw the State Diagram only (do not write any Truth Tables).

Answer 1

C and d are synchronous sequential Circuits because all the circuit are derived by the same clock. So these circuit are synchronous sequential circuit. 2) So the floor has 5 floors and ground floor. So, S_0 rightarrow ground floor S_1 rightarrow first floor S_2 rightarrow 2nd floor S_3 rightarrow 3rd floor S_4 rightarrow 4th floor S_4 rightarrow 4th floor S_5 rightarrow 5th floor output = floor no input are up and down let Suppose input are X X = 0, Down X = 1, Up State diagram So here total 6 states, So we require minimum 3-bits of state S_0 = 000, S_1 = 001, S_2 = 010, S_3 = 011 S_4 = 100, S_5 = 101