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ECE 3110: Introduction to Digital Systems Instructor: Dr. Omar Elkeelany Tel: 931-372-3677 Course web:

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Presentation on theme: "ECE 3110: Introduction to Digital Systems Instructor: Dr. Omar Elkeelany Tel: 931-372-3677 Course web:"— Presentation transcript:

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

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

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

4 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,…

5 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 …

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

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

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

9 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

10 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.

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

12 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


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