EE101Lecture13

EE101Lecture13 - Introduction to Digital Logic Lecture 13:...

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© Mark Redekopp, All rights reserved Introduction to Digital Logic Lecture 13: Multiplexers Demultiplexers
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© Mark Redekopp, All rights reserved Cascading Muxes Use several small muxes to build large ones Rules 1. Arrange the muxes in stages 2. Outputs of 1 stage feed to inputs of the next 3. All muxes in a stage connect to the same group of select bits Usually, LSB connects to first stage MSB connect to last stage
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© Mark Redekopp, All rights reserved Building a 4-to-1 Mux I 1 Y S I 0 I 1 Y S I 0 I 1 Y S I 0 Stage 1 Stage 2 S 1 S 0 S 0 Y D 0 D 1 D 2 D 3 S 1 S 0 4-to-1 mux built w/ 2-to-1 muxes Rule 1: Outputs from stage 1 connect to inputs of stage 2 Rule 2: LSB S 0 connect to all muxes in first stage. MSB S 1 connects to all muxes in second stage
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© Mark Redekopp, All rights reserved Building a 4-to-1 Mux I 1 Y S I 0 I 1 Y S I 0 I 1 Y S I 0 Stage 1 Stage 2 S 1 S 0 S 0 Y D 0 D 1 D 2 D 3 S 1 S 0 D 3 1 1 D 2 0 1 D 1 1 0 D 0 0 0 Y S 0 S 1 Walk through an example: S 1 S 0 = 01 10
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© Mark Redekopp, All rights reserved
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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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EE101Lecture13 - Introduction to Digital Logic Lecture 13:...

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