Presentation on theme: "Digital Electronics Dr. Bahawodin Baha, University of Brighton, UK."— Presentation transcript:
1Digital Electronics Dr. Bahawodin Baha, University of Brighton, UK. March 2007Digital Systems, Principles and Applications, 10th EditionR.J Tocci, N. S. Windmer, G. L. Moss, 2007.Applications:ComputersTelecommunicationAutomationMedical Science and TechnologyTransportationSpace ExplorationEntertainmentHome AppliancesOthers
2Course Summary Overview of Electronics Digital Electronics Number systems, decimal, binary, hexadecimalCombinational logic circuitsSequential logic circuitsComputer Systems
3Combinational Logic Systems Course Summary (cont.)Combinational Logic SystemsNumber systems: Binary, decimal and hexadecimal conversions and calculationsBasic logic gates: AND, OR, NOT and Ex-ORTruth tables, Boolean equations.Combinational logic circuit design: General hierarchical logic design methodologyMinimisation using Karnaugh maps and Boolean algebra, De-Morgan’s laws.Simulation of gates and combinational logic designsImplementation and testing of designs using a suitable version of TTL series ICs.Practical aspects of using logic ICs: data sheets, current and voltage characteristics, timing issues, output types, compatibility, families etc..
4Course Summary (cont.) Sequential logic design Flip-flops: SR, JK, D, T types, truth tables, excitation tables and device operation.Flip-flop applications: Registers and counters (asynchronous); MSI and LSI devicesSynchronous counter and sequence generator design method
5Course Summary (cont.) Introduction to Microprocessor Systems Overview of computer systems architectures, a simple microprocessor-based system, the stored programme concept.Design of a microprocessor based systemDifferences between microprocessors and microcontrollers.Brief history of microprocessors and microcontrollers.
6Overview of Electronics Analogue electronicsPower electronicsPhysical electronicsDifferences between digital and other types of electronicsNumerical Presentation
7In 1947, Transistor was invented in Bell labs in the USA. It was as tall as the face of wristwatch.In November 2001, another Bell lab team has built a transistor from a single Molecule - small enough to fit about 10 million transistors on the head of a pin.
8Numerical Representation There is two ways to represent numerical values.1- AnalogueIn analogue representation one quantity is represented by another quantity which is directly proportional to the first quantity.Analogue = Continuous2- DigitalIn digital representation the quantities are not represented by proportional quantities but symbols called digits. The digital representation is in discrete steps.Digital = DiscreteLogic Level in digital representation, 0 – 0.8 logic 0 and 2 – 5 logic 1.Voltage between 0.8 V and 2 V are unacceptable and are never used.
9Converting decimal to binary and Converting decimal to hexadecimal Number systemsType of NumbersDecimal, Binary, Octal and HexadecimalConverting decimal to binary andConverting decimal to hexadecimalConverting binary to hexadecimal
10Number Systems g Decimal Binary Hexadecimal 0000 1 0001 2 0010 3 0011 Base of 10BinaryBase 0f 2HexadecimalBase of 160000100012001030011401005010160110701118100091001101010A111011B121100C131101D141110E151111Fg
11Converting Decimal to Binary Convert Therefore, = (1000)2LSB, Less Significant BitMSB, Most significant BitTo examine(0 X 2 0) + (0 X 2 1) + (0 X 2 2) + (1 X 2 3) = 8 decimal into binary
122nd Example Convert 624 decimal into binary 624 decimal = in binary.To examine the result(1 X 2 4) + (1 X 2 5) + (1 X 2 6) + (1 X 2 9) = 624
13Converting Decimal to Hex Find the Hex equivalent of (3875)(3875) = (F23)HTo examine(15 X 162) + (2 X 161) + (3 X 160) = 3875
14Converting Hex to Decimal Convert (AF16B)16 to decimal.(AF16B)16 = [(10 X 164) + (15 X 163) + (1 X 162) + (6 X 161) + (11 X 160)]= ( )= (717163)10
15Converting Binary to Hex To convert Binary into Hex, simply group them in four and write down the Hex equivalent for each group.Example:( ) 2 = (1011)2 (0011)2 = (11)10 (3)10 = B316
16Main Points Digital Electronics use many exciting applications Introduction to digital electronicsNumber systems: Decimal, binary and hexConverting from one number system into another
17The End Thank you for your attention. Any questions? Good luck and have fun!