Selection#

Hardware routes information.

Selection logic connects one of many to one, or one to one of many, under the control of a few select lines. Decoders turn a binary code into a single active output; encoders do the reverse; multiplexers and demultiplexers steer data along chosen paths. These are the switches and signposts of a digital system.

Sections#

• Decoder — Activate one output from a binary code.
• Encoder — Collapse an active input back to a binary code.
• Multiplexer — Select one of many inputs onto a single output.
• Demultiplexer — Route one input to one of many outputs.