week5a - Pocket Calculator ■ Know how to implement the...

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Unformatted text preview: Pocket Calculator ■ Know how to implement the arithmetic circuits ■ What if you want to have some additional logic circuits: ■ AND ■ OR ■ Addition ■ Subtraction ■ Need circuits to handle routing Standard Circuit Elements ■ Develop implementations of important “Building Blocks” ■ Used in Networks, Computers, Stereos, etc. ■ Multiplexer: Combine N sources onto 1 wire ■ Decoder: Determine which input is active ■ Encoder: Convert binary to one-of-N wires Multiplexer ■ An element that selects data from one of many input lines and directs it to a single output line ■ Input: 2 N input lines and N selection lines ■ Output: the data from one selected input line ■ Multiplexer often abbreviated as MUX Multiplexer Implementation ■ 4:1 MUX Multiplexer Expansion ■ Construct a 16:1 MUX using 4:1 MUX’s Multiplexers in General Logic ■ Implement F = XYZ + YZ with a 8:1 MUX 8:1 MUX 1 2 3 4 5 6 7 S2 S1 S0 F Multiplexers in General Logic (cont.) ■ Implement F = XYZ + YZ with a 4:1 MUX S1 S0 4:1 MUX 1 2 3 F Decoders...
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This note was uploaded on 04/07/2008 for the course EECS 203 taught by Professor Wu during the Winter '08 term at Northwestern.

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week5a - Pocket Calculator ■ Know how to implement the...

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