Chapter 1fivedots.coe.psu.ac.th/.../07/Chapter1_241-208.pdf · 241-208 CH1 14 1.5 Digital...
Transcript of Chapter 1fivedots.coe.psu.ac.th/.../07/Chapter1_241-208.pdf · 241-208 CH1 14 1.5 Digital...
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Chapter 1
Introduction: Digital Systems &
Logic Design
By Taweesak Reungpeerakul
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Digital Systems
� Digital and Analog Quantities
� Parameters of Pulse Waveform
� Basic Logic
� Combinational Logic
� Digital Integrated Circuits
� An example of Digital System
� Design Flow
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1.1 Digital & Analog Quantities
� Analog Quantity?
� Digital Quantity?
� Which one has more advantages?
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Analog & Digital Example
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Analog & Mixed System
� Analog System
� Digital and Analog System
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1.2 Binary Digits, Logic Levels, and Digital Waveforms
� Binary Digits:
� Code:
� Logic Level:
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Digital Waveforms
� Pulse
Positive-going pulse Negative-going pulse
� Waveform Characteristic
� Question
H
L
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Clock and Bits Waveforms
� Clock is a periodic waveform (signal) in which each interval
between pulse equals the time for one bit
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Timing Diagrams
� How 2 or more waveforms change and relate
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1.3 Basic Logic Operations
In1 In2 Out
0 0 1
0 1 1
1 0 1
1 1 0
In1 In2 Out
0 0 0
0 1 0
1 0 0
1 1 1
In Out
0 1
1 0
Truth Table
Symbol
ORANDNOT
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1.4 Basic Logic Functions
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Basic Logic Functions (cont)
� Demux
S0
D
S3S2S1
C0C1 En
MultiplexerO0
D
O3O2O1
C0C1 En
Demultiplexer
� Mux
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Basic Logic Functions (cont)
� Flip-flops
� Counters
� Registers
Q
QSET
CLR
DD
CLK
CLR
SETQ
Q
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1.5 Digital Integrated Circuits
� IC Packages: DIP, SMT, SOIC, PLCC, LCCC, FP
� IC Complexity Classifications
� SSI: gate ≥ 12, basic gates & flip-flops
� MSI: 12 ≤ gate ≥ 99, logic functions
� LSI: 100 ≤ gate ≥ 9999, including memory
� VLSI: 10,000 ≤ gate ≥ 99,999
� ULSI: gate ≥ 100,000
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Integrated Circuit Technologies
� Types of Transistors
� Bipolar Junction Transistors
� MOSFETs (metal-oxide semiconductor field-effect transistors)
� Bipolar used in: transistor-transistor logic (TTL) and emitter-couple logic (ECL)
� MOSFETs used in: complementary MOS
(CMOS) and n-channel MOS (NMOS)
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1.6 Testing and Troubleshooting Instruments
� Oscilloscope
� Analog
� Digital
� Logic Analyzer
� DC Power Supply
� Function Generator
� Digital Multimeter
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1.7 Digital System Application
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Design Flow