Building a multiplexer
Here is a truth table for the multiplexer, based on our description from the previous page:
The multiplexer routes one of its data
inputs (D0 or D1) to the output Q, based
on the value of S.
—If S=0, the output will be D0.
—If S=1, the output will be D1.
You can then find an MSP for the mux output Q.
Q = S’D0 + S D1
Note that this corresponds closely to our English
specification above—sometimes you can derive an
expression without first making a truth table.
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