EE1003_project_part2_release

EE1003_project_part2_release - EE1003 INTRODUCTION TO...

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EE1003 I NTRODUCTION TO SIGNALS AND C OMMUNICATIONS : PROJECT Part 3: Hardware
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M AIN CONTENT The overall view of communications. Binary logic. Basic gates and IC. D flip-flop and sequential logic. Counter and shift registers. Digital phase lock loop 74HC297. PCM codec TP3054/7. TTL levels. 2
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Networks (Internet) Computers &microprocessors Basic logic gates T HE OVERVIEW OF COMMUNICATIONS . Services Telephone Email Newsgroups WWW BLOG Facebook Twitte You create it! 3 Binary logic Bi-states devices Envisions: every devices & everybody can be connected at any time, anywhere. New technologies: sensor networks, NFC, hi- speed wireless networks.
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B INARY L OGIC Analogy signals Vs. digital signals Bi-state devices Binary and decimal number systems. 4
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DIGITAL SIGNALS V S . A NALOGY SIGNALS 5 Robustness to noise
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DIGITAL SIGNALS V S . A NALOGY SIGNALS Amplitude Digital signals: only High or Low is meaningful Analogy signals: any possible values Flexibility for processing Security Protocols Reference book page 6. 6
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T WO - STATE DEVICES These devices have either “ON” and “OFF” to represent logic High and LOW. Generate a pulse. Pressbouton doesn’t work contact bounce cause undefined values Solution: debounced logic switch. Toggle switch cannot be applied directly. 7
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B INARY AND DECIMAL NUMBER SYSTEMS How decimal number system works? Similarly, in binary number system, Advantage: this number can be recorded by 7 binary devices which can maintain their states. 8 0 1 2 10 5 10 6 10 1 165 × + × + × = 165 2 1 2 0 2 1 2 0 2 0 2 1 2 0 2 1 10100101 0 1 2 3 4 5 6 7 = × + × + × + × + × + × + × + × = Byte bit MSB LSB
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B INARY AND DECIMAL NUMBER SYSTEMS . Questions: How to convert to each other? How about fraction number? 9
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B ASIC GATES AND IC S NOT gate AND gate --- NAND gates OR gate --- NOR gate XOR gate Combinational logic design 10
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NOT GATE Notation Boolean expression: Logic symbol: Function Invert the input. 0 1 and 1 0. Truth table 11 A X = 74HC04
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AND GATES Notation Boolean expression: Logic symbol: Function Truth table 12 W B A = 74HC08 74HC00 NAND gate
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AND GATES More than 2 inputs. Input variables A, B and C. 13
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