Digital Design Session 13
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The document provides an overview of multiplexers (mux), detailing their function as devices that route digital information from multiple sources to a single output line. It covers the implementations of 2-to-1 and 4-to-1 line multiplexers, including their symbols and representations, as well as quizzes to assess understanding. Additionally, it explains the role of the enable signal in a quadruple 2-to-1 line multiplexer.
Digital Design Session 13
- 1. Digital Design – © 2020 Mouli Sankaran Email: mouli.sankaran@yahoo.com
- 2. Digital Design – © 2020 Mouli Sankaran Email: mouli.sankaran@yahoo.com 2 Session 13: Focus Multiplexers (MUX) ◦ 2-to-1 line MUX Implementation ◦ 4-to-1 line MUX Implementation ◦ MUX Symbols/Representation
- 3. Digital Design – © 2020 Mouli Sankaran Email: mouli.sankaran@yahoo.com Multiplexer (MUX)
- 4. Digital Design – © 2020 Mouli Sankaran Email: mouli.sankaran@yahoo.com 4 Multiplexer (MUX) A multiplexer (MUX) is a device that allows digital information from several sources to be routed onto a single line for transmission A basic MUX has several data-input lines and a single output line It has data-select inputs, which permit digital data on any one of the inputs to be switched to the output line Multiplexers are also known as data selectors
- 5. Digital Design – © 2020 Mouli Sankaran Email: mouli.sankaran@yahoo.com 5 2-to-1 line Multiplexer When S = 0, I0 will be available at Y When S = 1, I1 will be available at Y
- 6. Digital Design – © 2020 Mouli Sankaran Email: mouli.sankaran@yahoo.com 6 4–to-1 line Multiplexer
- 7. Digital Design – © 2020 Mouli Sankaran Email: mouli.sankaran@yahoo.com 7 Implementation: 4-to-1 line Multiplexer D0 D1 D2 D3
- 8. Digital Design – © 2020 Mouli Sankaran Email: mouli.sankaran@yahoo.com 8 Quiz 1: Draw the Output Waveform Given the data-input and the data-select waveforms, draw the output waveform
- 9. Digital Design – © 2020 Mouli Sankaran Email: mouli.sankaran@yahoo.com 9 Quadruple 2-to-1-line Multiplexer The circuit has four multiplexers, each capable of selecting one of two input lines Outputs Y3Y2Y1Y0 Inputs B3A3 B2A2 B1A1 B0A0 S – Selector Input E – Enable Signal What is the purpose of an Enable signal here? To make sure that only when needed (enabled) one of the dataset (either A or B) is available at the output And not to have one of the inputs at the output always
- 10. Digital Design – © 2020 Mouli Sankaran Email: mouli.sankaran@yahoo.com 10 Mux Symbols in Use 4-to-1 Line Mux 8-to-1 Line Mux
- 11. Digital Design – © 2020 Mouli Sankaran Email: mouli.sankaran@yahoo.com 11 Quiz 2: What are the values at the output (Q)? D0 D1 D2 D3 S0 S1 S2 S2 S1 S0 Selectors Output (Q) D00 0 0 A B S Q Function Table 1 1 1 D3 1 0 1 D2 0 0 1 D1
- 12. Digital Design – © 2020 Mouli Sankaran Email: mouli.sankaran@yahoo.com 12 Session 13: Summary Multiplexers (MUX) ◦ 2-to-1 line MUX Implementation ◦ 4-to-1 line MUX Implementation ◦ MUX Symbols/Representation
- 13. Digital Design – © 2020 Mouli Sankaran Email: mouli.sankaran@yahoo.com 13 References Ref 1 Ref 2