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Lecture 1

# CSE 120 Lecture 1: Logical and Binary Systems, ANDOR, NAND-NOR Logic, Truth Tables, Realizations

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Arizona State University

Computer Science and Engineering

CSE 120

Formicone

spring

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CSE 120 Lecture One Notes Logical and Binary Systems, ANDOR, NANDNOR Logic, Truth tables, Realizations Logical and Binary Systems Digital circuits process signals that contain just two levelsstates Logic 0 Logic 1 represents a higher voltage Typically referred to as a HIGH value Logic 1 Logic 0 represents a lower voltage Typically referred to as a LOW value Each discrete voltage levels are referred to as Binary Digits or Binary BITS Binary number system is a Base2 number system Follows the same rules as other mathematical systems like Base10 For example: Instead of powers of ten (10 ) binary numbers use power of two (2 ) ANDOR This acronym represents two logic gates AND OR AND gate If 0 is called false and 1 is called true, the gate acts in the same way as a logical and operator OR gate Acts in the fashion as a logical or The output is true if either or both of the inputs true If both are false, then the output will be false as well

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