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ECE 2110: Introduction to Digital Systems

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1 ECE 2110: Introduction to Digital Systems
Instructor: Dr. Omar Elkeelany Tel:

2 ECE 2110: Introduction to Digital systems
Lecture 1: Introduction ECE 2110: Introduction to Digital systems

3 A successful digital designer:
Be competent in: Debugging Business requirements and practices Risk-taking Communication ECE 2110: Introduction to Digital systems

4 ECE 2110: 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 2110: Introduction to Digital systems

5 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 2110: Introduction to Digital systems

6 ECE 2110: Introduction to Digital systems
Analog versus Digital Analog Voltage meter Digital Voltage meter 103.5 About 100 ECE 2110: Introduction to Digital systems

7 Analog offers Continuous Spectrum Digital offer distinct Steps
ECE 2110: Introduction to Digital systems

8 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 2110: Introduction to Digital systems

9 ECE 2110: 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 2110: Introduction to Digital systems

10 ECE 2110: 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 2110: Introduction to Digital systems

11 ECE 2110: Introduction to Digital systems
Summary Digital devices Digital vs. analog Why digital? ECE 2110: Introduction to Digital systems

12 ECE 2110: Introduction to Digital systems
Next… (Chapter ) Integrated circuits PLD Digital design levels HW: Work Wakerly problems 1.3,1.6     ECE 2110: Introduction to Digital systems

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