The George Washington University School of Engineering and Applied Science Department of Electrical

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The George Washington UniversitySchool of
Engineering and Applied ScienceDepartment of
Electrical and Computer Engineering

• ECE122 Lab 6
• Multiplexers, Parity Generators and other Boolean
  functions using MUX

Jason Woytowich Ritu Bajpai Last revised on
October 8, 2007
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Multiplexers (Review)

• A multiplexer has n select lines, 2n inputs and 1
  output.
• The number represented by the select lines
  chooses one of the inputs to be placed on the
  output.

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4X1 Multiplexer
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Homework from last lab...

• You were supposed to
• Build and test a 2x1 multiplexer.
• Build a 4x1 multiplexer from your 2x1
  multiplexer. Test and layout.

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Application of multiplexers

• Now we are ready to learn the application of
  multiplexers to make useful circuits like parity
  generator and adder.

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Parity Generator (Lab Exercise)

• Build a circuit that determines if the number of
  inputs that are high is even or odd.
• 3-bits using a 4x1 multiplexer.
• You have to do the layout and simulate your
  extracted layout. You may simulate your schematic
  to check its correctness but schematic simulation
  is not mandatory for this lab exercise.

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Results and Analysis

• Test (from the layout simulation) your parity
  generator for all possible combinations of 3 bit
  input.
• Show the output waveforms (from the layout
  simulation) for the above test in your lab
  report.
• What is the application of a parity generator?

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Homework

• Implement a 1-Bit full adder using a 4x1
  multiplexer.
• Layout your adder and simulate from extracted
  layout.
• You should test your circuit (from layout
  simulation) for all possible combinations of
  input.