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517 341: Digital Logic Design

517 341: Digital Logic Design. Apisake Hongwitayakorn e: apisake@cp.su.ac.th w: http://www.cp.su.ac.th/~apisake/course/517341. What is this course all about?. The fundamental of Digital Logic Binary numbers and relate number systems Digital circuit building block How to design

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517 341: Digital Logic Design

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  1. 517 341: Digital Logic Design Apisake Hongwitayakorn e: apisake@cp.su.ac.th w: http://www.cp.su.ac.th/~apisake/course/517341

  2. What is this course all about? • The fundamental of Digital Logic • Binary numbers and relate number systems • Digital circuit building block • How to design • Combinational logic circuits • Sequential logic circuits

  3. Course Management

  4. Class • Lectures (2 hrs/week) • Apisake Hongwitayakorn • Time: Thu 8:30-10:15 • Venue: 1239 SciBldg-1 • Labs (3 hrs/week) • Noppadol Sukklomcheep • Time: Wed 12:05-14:45 • Venue: 1227 SciBldg-1

  5. Assessment • Lecture : Lab = 75% : 25% • Lecture: • Assignments & Quizzes 20% • Midterm 25% • Final 30% • Lab: (details will be described) • Attendance • Lab Reports • Midterm • Final

  6. Courseware • Lecture: • Slides* • A tool called “WinLogiLab”** • Lab: • Worksheets * Will be available on my webpage. ** Get this from http://www.gu.edu.au/???

  7. Introduction to Digital Systems

  8. Digital Technology • The term digital is derived from the way computer perform operations  by counting digits. • Today, digital tech is applied in a wide range of areas. • The tech has progressed from vacuum-tube to discrete transistors to complex ICs.

  9. Digital and Analog Quantities • 2 categories of electronic circuits: • Analog • Digital • Analog quantity = continuous values • Digital quantity = a discrete set of values

  10. Analog Quantity • Most things in nature  analog form • Temperature, pressure, distance, etc • Smooth, continuous curve like this: Temp Time

  11. Digital Quantity • Sampled-value representation (quantization) • Each dot can be digitized as a digital code (consists of 1s and 0s) Temp Time

  12. Digital Advantages • Digital data can be processed and transmitted more efficiently and reliably than analog data. • Digital data has a great advantage when storage is necessary. • Let’s talk about digital music…

  13. Digital Music • The media is very compact but higher-density (and counting): • CDs • Memory cards • No more bulky and noise-prone media like cassette tape http://www.dpreview.com/news/0303/sandisk512mb1gbsdcard.jpg http://www.wwwk.co.uk/images/homepage/compact-disc.jpg http://www.cricketsoda.com/images/music/cassette_tape.jpg

  14. Digital systems are everywhere!!!

  15. Binary Digits, Logic Levels, & Digital Waveforms

  16. Binary Digits • Binary system (either 0 or 1) • Bit (comes from binary digit) • Digital circuits: • 1 represents HIGH voltage • 0 represents LOW voltage • Groups of bits (combinations of 0s and 1s) are called codes • Being used to represent numbers, letters, symbols, (i.e. ASCII code), instructions, and etc.

  17. Logic Levels • The voltages used to represent a 1 and 0 are called logic levels. • Ideally, there is only HIGH (1) and LOW (0). • Practically, there must be thresholds to determine which one is HIGH or LOW or neither of them. • CMOS • (2V to 3.3V  HIGH) • (0V. To 0.8V  LOW) VH(max) HIGH (binary 1) VH(min) Not allowed VL(max) LOW (binary 0) VL(min)

  18. Digital Waveforms • Voltage levels that are changing back and forth between HIGH and LOW • (Ideal) pulse • At t0 leading edge, at t1  trailing edge HIGH HIGH LOW LOW t0 t0 t1 t1 Positive-going pulse Negative-going pulse

  19. Non-Ideal Pulse 90% tw 50% Amplitude Pulse width 10% tf tr Rise time Fall time

  20. Waveform Characteristics • Waveforms = series of pulses (called pulse train) • Periodic • Period (T) = T1 = T2 = T3 = … = Tn • Frequency (f) = 1/T • Nonperiodic T2 T3 T1

  21. Duty Cycle • Ratio of the pulse width (tw) to the period (T) Duty cycle = ( tw / T ) x 100%

  22. Example • From a portion of a periodic waveform (as shown) determine: • Period • Frequency • Duty cycle T tw 0 1 10 11 t (ms)

  23. Waveform & Binary Information Bit time 1 clock 0 1 A 0 Bit sequence represented by waveform A 1 0 1 0 0 1 1 0 0 1 0 1

  24. Data Transfer • Binary data are transferred in two ways: • Serial – bits are sent one bit at a time • Parallel – all the bits in a group are sent out on separate lines at the same time (one line for each bit) • Serial over Parallel • Advantage: less transmission line • Disadvantage: takes more time

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