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ENSC252, Fall 2024

Practice Questions #3

1. Design a self correcting mod-6 counter using JK flip flops in which all the unused state leads to state CBA=000.

2. Design a counter with T flip-flops that goes through the following binary repeated sequence: 0, 1,3,7,6,4.

Show that when binary states 010 and 101 are taken to be don't-care conditions, the counter may not operate properly. Find a way to correct the design.

3. Consider a sequential digital circuit consisting of T flip flops and D flip flop as shown in the figure. CLKIN is the clock input to the circuit. At the beginning Q1, Q2 and Q3 have values of 0,1 and 1 respectively.Write the  state table.Also mention the values of Q1,Q2 and Q3 which is not obtained with  this circuit.

4.A sequential circuit with two D Flip-Flops,A and B; two inputs, x andy; and one output, z, is specified by the following next-state and output equations:

A(t+1) = x ′y + xA

B(t+1) = x ′B + xA

z = B

a) Draw the logic diagram of the circuit.

b) List the state table for the sequential circuit.

c) Draw the corresponding state diagram.

5. Design the sequential digital circuit for the given state diagram of Moore model using JK flipflops.

6. Design the sequential digital circuit for the given state diagram of Mealy model using JK flipflops.