ECE 3110: Introduction to Digital Systems

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Presentation transcript:

ECE 3110: Introduction to Digital Systems Instructor: Dr. Omar Elkeelany Email: OElkeelany@tntech.edu Tel: 931-372-3677 Course web: http://iweb.tntech.edu/oelkeelany/3110

ECE 3110: Introduction to Digital systems Lecture 1: Introduction ECE 3110: Introduction to Digital systems

A successful digital designer: Be competent in: Debugging Business requirements and practices Risk-taking Communication ECE 3110: Introduction to Digital systems

ECE 3110: Introduction to Digital systems Analog vs. Digital Analog: time-varying signals Take any value across a continuous range of voltage, current or whatever metric Digital: SAME. But pretend they don’t. Modeled as taking only one of two discrete values at any time 0/1, LOW/HIGH, FALSE/TRUE,… ECE 3110: Introduction to Digital systems

Examples of once-analog systems that have now gone digital: Still pictures: film-->digital memory chips DVD: MPEG-2 CD Digital telephone Traffic lights … ECE 3110: Introduction to Digital systems

ECE 3110: Introduction to Digital systems Analog versus Digital Analog Voltage meter Digital Voltage meter 103.5 About 100 ECE 3110: Introduction to Digital systems

Analog offers Continuous Spectrum Digital offer distinct Steps ECE 3110: Introduction to Digital systems

Analog has Ambiguity Digital has only one interpretation Analog Clock Digital Clock 1:56 pm 1:56 About 2:00 1:56 1:50 ECE 3110: Introduction to Digital systems

ECE 3110: Introduction to Digital systems Why Digital? Reproducibility of results Ease of design: digital design is logical (vs. mathematical) Flexibility Programmability Speed of delivery Economy Steadily Advancing Technology ECE 3110: Introduction to Digital systems

ECE 3110: Introduction to Digital systems Digital Devices Gates: AND, OR, NOT (inverter): most important gates. Can realize any digital function. NAND, NOR… Flip-flops: Stores 0/1, built from gates Gates: Combinational circuit: output depends only on the current input combination. Flip-flops: Sequential circuit: output depends on current input as well as past inputs. Has memory of past events. ECE 3110: Introduction to Digital systems

ECE 3110: Introduction to Digital systems Summary Digital devices Digital vs. analog Why digital? ECE 3110: Introduction to Digital systems

ECE 3110: Introduction to Digital systems Next… (Chapter 1.6--1.12) Integrated circuits PLD Digital design levels HW: Work Wakerly problems 1.3,1.6 ECE 3110: Introduction to Digital systems