1. The George Washington University School of Engineering and Applied Science Department of Electrical and Computer Engineering ECE122 – Lab 6 Multiplexers, Parity Generators and other Boolean functions using MUX Ritu Bajpai October 9, 2008

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

3. 4X1 Multiplexer X1 X2 X3 X4 S1S2 O

4. 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.

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

6. 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 simulate your circuit and do the layout.

7. Results and Analysis ● Test your parity generator for all possible combinations of 3 bit input. ● Show the output waveforms for the above test in your lab report. ● What is the application of a parity generator?

8. Homework ● Implement a 1-Bit full adder using a 4x1 multiplexer. ● Simulate and layout your adder. ● You should test your circuit for all possible combinations of input.