Lecture10 - 1/10 ENSC150 Lecture 10 Agenda Encoders...

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ENSC150 Lecture 10 Agenda Encoders Priority Encoders Multiplexers 1/10 Lecture 10 Atousa Hajshirmohammadi, SFU
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Encoders Encoder performs the reverse operation of a decoder. Usually has “ 2 n ” inputs and “ n ” outputs. one and only one input line should be “1” at a time. Outputs will be the binary representation of the input line that is equal to “1”. 2/10 Lecture 10 Atousa Hajshirmohammadi, SFU
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4-to-2 Encoder D 3 D 2 D 1 D 0 A 1 A 0 0 0 0 1 0 0 1 0 0 1 0 0 1 0 0 0 Does the encoder have any don’t care conditions? How many combinations are possible for the 4 inputs? How many combinations are allowed? 3/10 Lecture 10 Atousa Hajshirmohammadi, SFU
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Priority Encoder “Priority Encoder” takes care of the don’t care conditions. If more than 2 inputs are “1” at a time, it gives priority to the input line with higher rank. D 3 D 2 D 1 D 0 A 1 A 0 0 0 0 0 0 0 0 1 0 0 1 0 0 0 1 1 0 1 0 0 0 1 0 1 0 1 1 0 0 1 1 1 1 0 0 0 1 0 0 1 1 0 1 0 1 0 1 1 1 1 0 0 1 1 0 1 1 1 1 0 1 1 1 1 D 3 D 2 D 1 D 0 A 1 A 0 4/10 Lecture 10 Atousa Hajshirmohammadi, SFU
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Priority. .. (cont.) Optimization: Implementation: 5/10 Lecture 10 Atousa Hajshirmohammadi, SFU
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This note was uploaded on 04/16/2009 for the course ENSC 150 taught by Professor Dr.atousahashirmohammadi during the Spring '09 term at Simon Fraser.

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Lecture10 - 1/10 ENSC150 Lecture 10 Agenda Encoders...

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