EE101Lecture12

EE101Lecture12 - Introduction to Digital Logic Lecture 12:...

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© Mark Redekopp, All rights reserved Introduction to Digital Logic Lecture 12: Multiplexers (“Muxes”)
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© 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 0 D 1 D 2 D 3 S 1 S 0 Y
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© Mark Redekopp, All rights reserved Multiplexers 1 0 0 1 1 0 1 (D 2 ) Thus, D2 is selected and passed to the output Select bits = 10 2 = 2 10 . 1 2 D 0 D 1 D 2 D 3 S 1 S 0 Y
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© Mark Redekopp, All rights reserved Multiplexers 1 0 0 1 0 0 0 D2 is being selected and passed. So if it changes the output changes as well. (D 2 ) D 0 D 1 D 2 D 3 S 1 S 0 Y
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© 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 0 1 0 0 0 (D 0 ) D 0 D 1 D 2 D 3 S 1 S 0 Y
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© Mark Redekopp, All rights reserved Building a Mux • To build a mux just decode the select bits, then AND the decoded outputs with the corresponding
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This note was uploaded on 02/27/2008 for the course EE 101 taught by Professor Redekopp during the Fall '06 term at USC.

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EE101Lecture12 - Introduction to Digital Logic Lecture 12:...

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