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lecture11 - CMPT 150 Combinational Circuits Page 1 CMPT 150...

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CMPT 150 Combinational Circuits Page 1 Rudimentary Logic Functions box5 Consider the possible single-bit functions: box5 The first and last columns are examples of value- fixing box5 The second column is called transferring box5 The third column is called inverting CMPT 150 Combinational Circuits Page 2 Enabling Circuits box5 It is sometimes useful to be able to control when the input signal is allowed to pass through to an output - this is called enabling the circuit box5 One easy way to do this is to AND the output of your circuit with an EN enable signal E.g. CMPT 150 Combinational Circuits Page 3 Decoders & Encoders box5 A Decoder is a combinational circuit that converts n inputs into at most 2 n outputs box5 2x4 Dec A 0 A 1 E D 0 D 1 D 2 D 3 box5 An Encoder does the opposite: box5 Converts 2 n inputs into n outputs box5 box5 Uses: box5 box5 4x2 Enc D 0 D 1 D 2 D 3 E A 0 A 1 CMPT 150 Combinational Circuits Page 4 Implementing a Decoder box5 For example, a 2x4 Decoder has a 2-bit input and 4-bit output

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lecture11 - CMPT 150 Combinational Circuits Page 1 CMPT 150...

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