Introduction to Digital Design

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Introduction to Digital Design

• ECE-331, Digital Design
• Dr. Ron Hayne
• Electrical and Computer Engineering

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Reference

• Instructor Prof. Ron Hayne
• Course Information
• http//ece.gmu.edu/rhayne/ece331/ece331.htm
• Corequisites
• ECE 331 301-3 Recitation
• ECE 332 201-3 Digital Electronics and Logic
  Design Lab

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Recitation

• Recitation Instructors
• Sahil Luthra
• email sluthra_at_gmu.edu
• Recitation Instructor office hours
• TBD
• Recitation sessions
• Monday, 1130 AM - 1220 PM, Enterprise Hall, rm
  173
• Tuesday, 430 - 520 PM, ST I, rm 112
• Friday, 1230 - 120 PM, ST II, rm 15

• Vamsi Teladevalapalli
• email vteladev_at_gmu.edu

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Administrative

• Office
• Science and Technology II, Room 235
• Office Hours
• Tue Thur 715 - 800 PM
• Other Times by Appointment
• Email
• rhayne_at_gmu.edu

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Administrative

• Students with Disabilities
• If you need special assistance, please inform me
  soon so that we can work something out.
• Makeup Exams
• Makeup exams are rarely given. Requests for a
  delayed Final Exam due to multiple tests in one
  day will ONLY be considered if proper forms are
  completed and in my hands prior to mid-semester
  Break.
• Course calendar is on the web
• http//ece.gmu.edu/rhayne/ece331/calendar_spring_
  05.pdf

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Grading

• Recitation/HW 20
• MidTerm Exam 40
• Final Exam 40
• Homework
• Assignments are on the web
• http//ece.gmu.edu/rhayne/ece331/homework.htm
• All homework will be accounted for and graded by
  the recitation instructor

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Homeworks

• Some Homeworks Require Use of VHDL
• Hands-on in ECE-332
• Mentor Graphics
• Installed on
• cpe02.gmu.edu (ECE Dept. Computer, Sun)
• Tutorial on 332 web page
• X-terminals
• PCs in ST-II room 265
• PCs in ST-I labs 2A and 2B

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VHDL Support

• IEEE Interactive VHDL Tutorial
• On-line on Computer Engineering Home page
• http//ece.gmu.edu/cpengr/vhdl.htm
• (password protected)
• IEEE Standard 1164, 1997

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Personal Software

• Not Required
• Cypress Semiconductor (Warp release 6.x)
• PC-based, 99
• Oriented towards Their PLD FPGA devices
• VHDL Subset simulator
• Aldec-HDL environment
• Student version 59.95
• http//www.aldec.com/ActiveHDL/university_studente
  dition.htm

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Honor Code

• You Are Encouraged to Collaborate With Other
  Students and/or Obtain the Assistance of the
  Recitation Instructor on Homework.
• Exams Are Closed Book, Closed Notes, No Use of
  Logic Functions on Calculators, and the Normal
  Honor Code Applies to All Exams.

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Required Textbook

• Analysis and Design of Digital Systems with VHDL
• Allen Dewey
• ISBN 0-534-95410-3
• 1997

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Questions?
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Analog vs Digital

• Analog
• Continuous
• Time
• Every time has a value associated with it, not
  just some times
• Magnitude
• A variable can take on any value within a range
• e.g.
• temperature, voltage, current, weight, length,
  brightness, color

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Quantization

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Analog vs Digital

• Digital
• Discontinuous
• Time (discretized)
• The variable is only defined at certain times
• Magnitude (quantized)
• The variable can only take on values from a
  finite set
• e.g.
• Switch position, digital logic, Dow-Jones
  Industrial, lottery, batting-average

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Analog to Digital

• A Continuous Signal is Sampled at Some Time and
  Converted to a Quantized Representation of its
  Magnitude at that Time
• Samples are usually taken at regular intervals
  and controlled by a clock signal
• The magnitude of the signal is stored as a
  sequence of binary valued (0,1) bits according to
  some encoding scheme

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Digital to Analog

• A Binary Valued, B 0, 1 , Code Word can be
  Converted to its Analog Value
• Output of D/A Usually Passed Through Analog Low
  Pass Filter to Approximate a Continuous Signal
• Many Applications Construct a Signal Digitally
  and then D/A
• e.g., RF Transmitters, Signal Generators

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Digital is Ubiquitous

• Electronic Circuits based on Digital Principles
  are Widely Used
• Automotive Engine/Speed Controllers
• Microwave Oven Controllers
• Heating Duct Controls
• Digital Watches
• Cellular Phones
• Video Games

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Why Digital?

• Increased Noise Immunity
• Reliable
• Inexpensive
• Programmable
• Easy to Compute Nonlinear Functions
• Reproducible
• Small

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Digital Design Process

• Computer Aided Design Tools
• Design entry
• Synthesis
• Verification and simulation
• Physical design
• Fabrication
• Testing

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VHDL

• Very High Speed Integrated Circuit
• Hardware
• Description
• Language
• A Formal Language for Specifying the Behavior and
  Structure of a Digital Circuit
• Allows Top-Down Design

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End of Lecture

• Administrative
• Analog/Digital