The Multiplexer
Multi what?
©2010 Akula LLC,
Jeremy R. Hertzberg,
BS CMPE
http://en.wikipedia.org/wiki/File:Multiplexer_8-to-1.svg
The Multiplexer or MUX
©2010 Akula LLC,
Jeremy R. Hertzberg,
BS CMPE

Is just another name for a switch that can
select from a lot of different inputs.

We are going to look at an 8 input
Multiplexer.
MUX

©2010 Akula LLC,
Jeremy R. Hertzberg,
BS CMPE
Given a number between 0 and 7, the
MUX will select one ‘track’ to let trains
through.
The MUX

©2010 Akula LLC,
Jeremy R. Hertzberg,
BS CMPE
The MUX can be used to select what
memory location to read next.
Demultiplexer or DEMUX
©2010 Akula LLC,
Jeremy R. Hertzberg,
BS CMPE

The DEMUX allows one input to be sent
one of several outputs.

For example if you wanted to send data
to a selected memory location.