EECS 1520 Chapter Notes - Chapter 4: Central Processing Unit, Sequential Logic, Abbreviation

• School: York University
• Department: Electrical Engineering and Computer Science
• Course: EECS 1520
• Professor: Paul Kashiyama

Document Summary

A voltage level in the range of 0 to 2 volts is considered low : interpreted as binary 0. A voltage level in the range of 2 to 5 volts is considered high : interpreted as binary 1. Signals in computers are constrained to be in one or the other. Gate is a device that performs a basic operation on electrical signals: accepts one or more input signals and produced a single output signal. Circuits combine gates to perform more complicated tasks: in a circuit, output value of one gate often serves as the input value for one or more other gates. Three notational methods used to describe behaviour of gates and circuits: boolean expressions. Form of algebra which variables and functions outcomes are either 0 or 1: logic diagrams. Each gate has a specific graphical symbol: truth tables. Defines that function of a gate by listing all possible input combinations that a gate could encounter, along with corresponding output.