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Assignment No. 03 Semester: Fall 2016 Digital Logic Design – CS302
Lectures:18-25

Total Marks: 20

Due Date: 11 Jan, 2017

Objectives:
Learn about programmable circuits, latches and flip flops
Instructions:
Please read the following instructions carefully before submitting assignment:
It should be clear that your assignment will not get any credit if:

The assignment is submitted after due date.
The assignment is submitted via email.
The assignment is copied from Internet or from any other student.
The submitted assignment does not open or file is corrupt.
It is in some format other than .doc/docx.

Note: All types of plagiarism are strictly prohibited.

For any query about the assignment, contact at CS302@vu.edu.pk

Important!
You have to provide all the steps of processing in all questions otherwise, marks will be deducted. Pictures of hand written/drawn diagram will also be marked as ZERO.
Question No. 01 Marks 10
Suppose we have a digital circuit expressed through the following truth table. You have to implement its circuit using PLA with minimum cost (minimum number of product terms).
A
B
C
D
Y

0
0
0
0
1

0
0
0
1
0

0
0
1
0
0

0
0
1
1
0

0
1
0
0
0

0
1
0
1
1

0
1
1
0
1

0
1
1
1
1

1
0
0
0
0

1
0
0
1
1

1
0
1
0
0

1
0
1
1
1

1
1
0
0
0

1
1
0
1
1

1
1
1
0
1

1
1
1
1
1

Question No. 02 Marks 10
Suppose the light signs of a shop are continuously blinking after every 2 seconds. You have been given information that input pulse provided to the lighting circuitry is clocking at a rate of 4 Hz.
Now, your task is to identify the number of J-K flip flops used to make your circuit blink every 2 seconds and draw the timing diagram of this circuit for every output like F0, F1 etc.

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