roles of input and output to be swapped so that a bi-directional multiplexer can function both as a demultiplexer and a multiplexer.

Multiplexers as PLDs

Multiplexers can also be used as programmable logic devices to implement Boolean functions. Any Boolean function of n variables and one result can be implemented with a multiplexer with n selector inputs. The variables are connected to the selector inputs, and the function result, 0 or 1, for each possible combination of selector

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