ELEC 101, Spring 2005
Prof. Rich Kozick

Homework 14

Date Assigned: Monday, April 25, 2005
Date Due: Monday, May 2, 2005

  1. Reading: Please continue to study Chapter 12 (all sections) and Chapter 13, Sections 13.1 and 13.2

  2. Final Exam: The final exam for ELEC 101 is scheduled for Thursday, May 5 at 3:30 PM in room Dana 137. The exam will be comprehensive, and you will be allowed to bring a page of notes with you. I will also collect your lab notebooks at the final exam.

  3. Please solve Problem 12.34 in the Bobrow text.

  4. 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.)

  5. Repeat the previous design using JK flip-flops.

Thank you.