CSC 371 - Systems I: Computer Organization and Architecture

Dr. R. M. Siegfried

Assignment 8 - p. 185/4-18a, 4-22; p. 235-238/5-6, 5-18

Due Friday, November 17, 2017

4-18a

Design a combinational circuit that generates the 9's complementof a BCD circuit.

4-22

Design an excess-3-to-binary decoder using the unused combinations as don't-care conditions.

5-6

A sequential circuit with two D flip-flops, A and B; two inputs x and y; and output z, is specified by the following next-state and output equations:

A(t + 1) = xy' + xB
B(t + 1) = xA + xB'
z = A
  1. Draw the logic diagram of the circuit
  2. List the state table for the sequential circuit
  3. Draw the corresponding state diagram

5-18

Design a sequential circuit with two JK flip-flops A and B and two inputs E and F. If E = 0, the circuit remains in the same state regardless of the value of F. When E = 1 and F = 1, the circuit goes through the state transitions from 00 to 01 to 10 to 11 back to 00, and repeats. When E = 1 and F = 0, the circuit goes through the state transitions from 00 to 11 to 10 to 01 back to 00 and repeats.

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