Combinational Circuits
Circuits whose outputs depend only on the present inputs: adders, multiplexers, decoders and comparators.
Easy
Combinational logic has no memory: the same inputs always give the same outputs, after a short propagation delay. Design steps: define the truth table, derive and simplify the expressions, then implement with gates or an HDL.
Sub-topics (3)
Adders
Half adders, full adders and ripple-carry adders add binary numbers.
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Multiplexers and Demultiplexers
A MUX selects one of many inputs to a single output; a DEMUX routes one input to one of many outputs.
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Encoders and Decoders
Decoders turn an n-bit code into one of 2ⁿ outputs; encoders do the reverse.
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