Lecture9 - 1/6 1/6 ENSC150 Lecture 9 Agenda Decoders Using...

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ENSC150 Lecture 9 Agenda Decoders Using Decoders to implement functions Using Decoders and Value Fixing to implement functions 1/6 1/6 Lecture 9 Atousa Hajshirmohammadi, SFU
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Decoders Consider two binary variables A and B . How many possible combinations of “0” and “1” can they have? A “2-to-4 line decoder” is a device that takes in these 2 variables and generates 4 outputs. Each output represents one of the input combinations and is “1” only if that combination has happened. Truth Table for a “2-to-4 decoder”: A B D 0 D 1 D 2 D 3 0 0 1 0 0 0 0 1 0 1 0 0 1 0 0 0 1 0 1 1 0 0 0 1 Formulate: Implement 2/6 2/6 Lecture 9 Atousa Hajshirmohammadi, SFU
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Decoders (cont.) In general decoders have n inputs and outputs. Each output line is the implementation of the corresponding to one of the input combinations. Decoders can be called “minterm builders”! Example: Design and implement a 1-to-2 decoder: 3/6 3/6 Lecture 9 Atousa Hajshirmohammadi, SFU
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3-to8 Decoder Design and implement a 3-to-8 decoder. A
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Lecture9 - 1/6 1/6 ENSC150 Lecture 9 Agenda Decoders Using...

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