ECE 3110: Introduction to Digital SystemsSlide 2A successful digital designer:Analog vs. DigitalExamples of once-analog systems that have now gone digital:Analog versus DigitalAnalog offers Continuous Spectrum Digital offer distinct StepsAnalog has Ambiguity Digital has only one interpretationWhy Digital?Digital DevicesSummaryNext… (Chapter 1.6--1.12)ECE 3110: Introduction to Digital SystemsInstructor: Dr. Omar ElkeelanyEmail: [email protected]: 931-372-3677Course web: http://iweb.tntech.edu/oelkeelany/3110ECE 3110: Introduction to Digital systemsLecture 1: IntroductionECE 3110: Introduction to Digital systemsA successful digital designer:Be competent in:DebuggingBusiness requirements and practicesRisk-takingCommunicationECE 3110: Introduction to Digital systemsAnalog 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 systemsExamples 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 systemsAnalog versus Digital103.5Analog Voltage meterDigital Voltage meterAbout 100ECE 3110: Introduction to Digital systemsAnalog offers Continuous SpectrumDigital offer distinct StepsECE 3110: Introduction to Digital systemsAnalog has AmbiguityDigital has only one interpretationAnalog Clock1:56 pmDigital ClockAbout 2:001:501:56 1:56ECE 3110: Introduction to Digital systemsWhy Digital?Reproducibility of resultsEase of design: digital design is logical (vs. mathematical)Flexibility ProgrammabilitySpeed of deliveryEconomySteadily Advancing TechnologyECE 3110: Introduction to Digital systemsDigital 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 systemsSummaryDigital devicesDigital vs. analogWhy digital?ECE 3110: Introduction to Digital systemsNext… (Chapter 1.6--1.12)Integrated circuitsPLDDigital design levelsHW:Work Wakerly problems