08-Multiplexers

08-Multiplexers - Mult 1 Multiplexers Today, well study...

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Unformatted text preview: Mult 1 Multiplexers Today, well study multiplexers, which are just as commonly used as the decoders we presented last time. Again, These serve as examples for circuit analysis and modular design. Multiplexers can implement arbitrary functions. We will actually put these circuits to good use in later weeks, as building blocks for more complex designs. Multiplexers 2 Multiplexers A 2 n-to-1 multiplexer sends one of 2 n input lines to a single output line. A multiplexer has two sets of inputs : 2 n data input lines n select lines, to pick one of the 2 n data inputs The mux output is a single bit, which is one of the 2 n data inputs. The simplest example is a 2-to-1 mux: The select bit S controls which of the data bits D0-D1 is chosen: If S=0, then D0 is the output (Q=D0). If S=1, then D1 is the output (Q=D1). Q = S D0 + S D1 Multiplexers 3 More truth table abbreviations Here is a full truth table for this 2-to-1 mux, based on the equation: Here is another kind of abbreviated truth table. Input variables appear in the output column. This table implies that when S=0, the output Q=D0, and when S=1 the output Q=D1. This is a pretty close match to the equation. Q = S D0 + S D1 Multiplexers 4 A 4-to-1 multiplexer Here is a block diagram and abbreviated truth table for a 4-to-1 mux....
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08-Multiplexers - Mult 1 Multiplexers Today, well study...

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