ece 3110: introduction to digital systems instructor: dr. omar elkeelany email:...
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ECE 3110: Introduction to Digital Systems
Instructor: Dr. Omar ElkeelanyEmail: [email protected]
Tel: 931-372-3677Course 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
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 chipsDVD: MPEG-2CDDigital telephoneTraffic lights…
ECE 3110: Introduction to Digital systems
Analog versus Digital
103.5
Analog Voltage meter
Digital Voltage meter
About 100
ECE 3110: Introduction to Digital systems
Analog offers Continuous SpectrumDigital offer distinct Steps
ECE 3110: Introduction to Digital systems
Analog has AmbiguityDigital has only one interpretation
Analog Clock
1:56 pm
Digital Clock
About 2:00
1:50
1:56
1:56
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
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
Summary
Digital devicesDigital vs. analogWhy digital?
ECE 3110: Introduction to Digital systems
Next… (Chapter 1.6--1.12)
Integrated circuitsPLDDigital design levels
HW:
Work Wakerly problems 1.3,1.6