EE101Lecture12

EE101Lecture12 - © Mark Redekopp All rights reserved...

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Unformatted text preview: © Mark Redekopp, All rights reserved Introduction to Digital Logic Lecture 12: Multiplexers (“Muxes”) © Mark Redekopp, All rights reserved Multiplexers • Along with adders, multiplexers are most used building block • 2 n data inputs, n select bits, 1 output • A multiplexer (“mux” for short) selects one data input and passes it to the output 4-to-1 Mux 2 n data inputs n select bits 1 output D D 1 D 2 D 3 S 1 S Y © Mark Redekopp, All rights reserved Multiplexers 1 0 1 1 1 (D 2 ) Thus, D2 is selected and passed to the output Select bits = 10 2 = 2 10 . 1 2 D D 1 D 2 D 3 S 1 S Y © Mark Redekopp, All rights reserved Multiplexers 1 0 1 D2 is being selected and passed. So if it changes the output changes as well. (D 2 ) D D 1 D 2 D 3 S 1 S Y © Mark Redekopp, All rights reserved Multiplexers 0 0 Thus, D0 is selected and passed to the output Select bits = 00 2 = 0 10 . 1 2 1 (D ) D D 1 D 2 D 3 S 1 S Y © Mark Redekopp, All rights reserved Building a Mux • To build a mux – Decode the select bits and include the corresponding data input. – Finally OR all the first level outputs together. S 1 S = 01 1 1 1 1 I I 1 I 2 I 3 S 1 S Y S 1 S S 1 S S 1 S I 1 I 1 I 1 1 1 © Mark Redekopp, All rights reserved Building a Mux • To build a mux – Decode the select bits and include the corresponding...
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This note was uploaded on 12/02/2009 for the course EE 101 at USC.

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EE101Lecture12 - © Mark Redekopp All rights reserved...

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