Combinatorial Logic Design Process. Example: Three 1s pattern detector Detect whether a pattern of at least three adjacent 1s occurs anywhere in an 8-bit.

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Presentation transcript:

Combinatorial Logic Design Process

Example: Three 1s pattern detector Detect whether a pattern of at least three adjacent 1s occurs anywhere in an 8-bit input, and output a 1 in that case. Simplified Circuit Notations 1) Multiple inputs for AND, OR 2) Inversion bubble instead of NOT 3) List the inputs multiple times

More Gates

Decoder (higher level building block) A decoder decodes an input n-bit binary number by setting exactly one of the decoder’s 2 n outputs to 1.

Multiplexer (MUX) An Mx1 multiplexer has M data inputs and one output, and allows only one input to pass through to that output. A set of select inputs determines which input to pass through.