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# Gate zx nottruthtable z x y z xy z xy nor gate z

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Unformatted text preview: brought his EFTPOS card (E=1) – David buys the item (B=1) – 4 inputs and one output – 24 combinations = 16 6 10/13/2011 Primitive gates David’ s purchase truth table • • • • • Types of DLGs A logic gate: N: needs W: wants C: cash E: eftpos B: buys – implements a combinational logic function – 2N possible functions of N variables – All can be described using primitive gates 24 = 16 combinations Logical AND operation X Y X Z = X and Y Z X Y Logical multiplication Z=1 if both X and Y are 1 Z Y X and or not xor nand, nor, xnor Logical OR operation Z AND gate – – – – – Y Z 0 0 0 0 1 0 1 0 0 1 1 1 AND truth table OR gate X Z = X or Y Z X Y Logical addition Z=1 if X or Y or both are 1 Y Z 0 0 0 0 1 1 1 0 1 1 1 1 OR truth table 7 10/13/2011 NOT operation (negation, complement, inversion) X NAND function (not AND) X Y Z X NOT gate ZX NOT truth table Z X .Y Z XY Z ( XY )' NOR gate Z XorY Z X Y Z ( X Y )' Z NAND truth table Z=1 if X is 0 or Y is 0 Drawing conventions Z Y Y 0 0 1 0 1 1...
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## This note was uploaded on 05/05/2013 for the course ELEC 1111 taught by Professor Jayashriravishankar during the One '11 term at University of New South Wales.

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