ELEC 101, Spring 1998
Prof. Rich Kozick

Homework 16

Date Assigned: Wednesday, April 29, 1998
Date Due: Friday, May 1, 1998, but not necessary to submit

  1. Reading: Please read Chapter 12, Section 12.3, and Chapter 13, Sections 13.1 and 13.2.

  2. Design a 2-bit UP-counter using D flip-flops. Your circuit should operate as follows:


    The outputs S1 S0 are the count: 00, 01, 10, or 11. When C = 1, then the output should increment by one with each clock pulse. The count should wrap-around to 00 after 11. When C = 0, the present count should be held. Explain your reasoning, and draw a diagram for your design. (Hint: Construct a state diagram, then a state transition table, and finally design appropriate combinational logic circuits.)

  3. Repeat the previous design using JK flip-flops.
Thank you.