Page 96 - Handout Digital Electronics

Exercise

1 Consider the truth table below:

D = 1
D A B F0 F1 F2 F3
1 0 0 1 0 0 0
1 0 1 0 1 0 0
1 1 0 0 0 1 0
1 1 1 0 0 0 1

(i) Use the truth table to produce the logic circuit diagram (4 marks)
(ii) Name the device and its application (2 marks)
(iii) In practice, is it true that D is always equal to 1? Explain (3 marks)
2 Two 4-bit binary numbers A and B are to be compared for equality. A=A3A2A1Ao = 1011 and
B=1101.
(i) Design (draw) a logic circuit diagram you would use to compare the two binary numbers.
Explain how your circuit diagram operates.
(ii) (ii) Produce the output logic equation

3 In practice a multiplexer and a de multiplexer are combined, what is the reason?

4 Consider the truth table below: Given that it is for a priority encoder, explain how it operates.

A3 A2 A1 A0 F1 F0
x x x 1 0 0
x x 1 x 0 1
0 1 x x 1 0
1 x x x 1 1

Lecture 11 Video Lecture

Watch the complete explanation of this chapter here:
https://www.youtube.com/watch?v=9q9yM7k7u5M

Lecture 11 Online Quiz

Test your understanding by completing the quiz:
https://forms.office.com/Pages/DesignPageV2.aspx?origin=NeoPortalPage&subpage=design&id=6It6CPsfU
EqeY6fdRNP5cqrl2mW71GRAiQAluYy6dIVUNTlKVjJTWkNDRkZRN0UzWVFaTjg1TVlUTi4u

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