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ECE 3110: Introduction to Digital Systems

ECE 3110: Introduction to Digital Systems. Instructor: Dr. Xubin (Ben) He Email: Hexb@tntech.edu Tel: 931-372-3462 Course web: http://www.ece.tntech.edu/hexb/311s04. Lecture 1: Introduction. Digital Design. Principles: continue to be important (correct) for years.

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ECE 3110: Introduction to Digital Systems

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  1. ECE 3110: Introduction to Digital Systems Instructor: Dr. Xubin (Ben) He Email: Hexb@tntech.edu Tel: 931-372-3462 Course web: http://www.ece.tntech.edu/hexb/311s04

  2. Lecture 1: Introduction Dr. Xubin He ECE 3110: Introduction to Digital systems

  3. Digital Design • Principles: continue to be important (correct) for years. • Practices: keep changing: a way to reinforce principles, and learn design methods. • Themes in digital design. Pp2 • Digital design-Engineering:Problem solving! Dr. Xubin He ECE 3110: Introduction to Digital systems

  4. A successful digital designer: • Be competent in: • Debugging • Business requirements and practices • Risk-taking • Communication Dr. Xubin He ECE 3110: Introduction to Digital systems

  5. 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,… Dr. Xubin He ECE 3110: Introduction to Digital systems

  6. Examples of once-analog systems that have now gone digital: pp3 • Still pictures: film-->digital memory chips • DVD: MPEG-2 • CD • Digital telephone • Traffic lights • … Dr. Xubin He ECE 3110: Introduction to Digital systems

  7. Digital Devices • Integrated Circuits that operate on Digital Data are in 95% of every electrical powered device in the U.S. • The theory of operation of these devices form a basis for many other courses in the EE/CS/COEN curriculum • The job market for engineers and computer scientists with Digital Design skills is at an all time high and will continue growing. Dr. Xubin He ECE 3110: Introduction to Digital systems

  8. Analog versus Digital Analog Voltage meter Digital Voltage meter 103.5 About 100 Dr. Xubin He ECE 3110: Introduction to Digital systems

  9. Analog offers Continuous SpectrumDigital offer distinct Steps Dr. Xubin He ECE 3110: Introduction to Digital systems

  10. Analog has AmbiguityDigital has only one interpretation Analog Clock Digital Clock 1:56 pm 1:56 About 2:00 1:56 1:50 Dr. Xubin He ECE 3110: Introduction to Digital systems

  11. Why Digital? • Reproducibility of results • Ease of design: digital design is logical (logical design) • Flexibility and Functionality • Programmability • Fast • Economy • Steadily Advancing Technology Dr. Xubin He ECE 3110: Introduction to Digital systems

  12. 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.

  13. Summary • Digital devices • Digial vs analog • Why digial Dr. Xubin He ECE 3110: Introduction to Digital systems

  14. Next… (Chapter 1.6--1.12) • Integrated circuits • PLD • Digital design levels • Fill out the survey form on the course web. Dr. Xubin He ECE 3110: Introduction to Digital systems

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