EEL 3705 3705L Digital Logic Design

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           College of Engineering

             EEL 3705 / 3705L
            Digital Logic Design

                        Fall 2006
             Instructor: Dr. Michael Frank

1/8/2010           M. Frank, EEL3705 Digital Logic, Fall 2006   1
                     FAMU-FSU College of Engineering

                      Lecture Outline
      Overview of the subject area:
          What’s Digital Logic Design all about?
      Overview of the course:
          Syllabus, policies, procedures
      Administrative matters:
          Sign-in sheet, Prereq form, Blackboard,
           1st assignment

1/8/2010                M. Frank, EEL3705 Digital Logic, Fall 2006   2
                        FAMU-FSU College of Engineering

                     What do we mean by
                    “Digital Logic Design?”
      Digital
          Using discrete physical states (e.g., on/off transistor,
           high/low voltage) to represent information
      Logic
          Using the basic operations of Boole’s algebra of logic to
           interpret, manipulate and process information
      Design
          To conceive, plan, analyze and construct the structure of
           working systems that will meet application requirements

1/8/2010                   M. Frank, EEL3705 Digital Logic, Fall 2006   3
                          FAMU-FSU College of Engineering

           Applications of Digital Logic Design
      All complex electronic systems today rely
       heavily on components whose design and
       operation is based (almost entirely) on
       digital logic principles, including:
           Microprocessors and microcontrollers
               The heart of the modern computer, and also
                embedded within all manner of other consumer and
                industrial electronic devices
           Digital Signal Processors
               Used in cellphones, cameras, networking equipment
           FPGAs (Field-Programmable Gate Arrays)
               Used for prototyping & in a wide range of equipment
           ASICs (Application-Specific Integrated Circuits)
               Semi-custom, used in many specialized applications
1/8/2010                     M. Frank, EEL3705 Digital Logic, Fall 2006   4
                         FAMU-FSU College of Engineering

           Electrical & Computer Engineering
           and the Design of Electronic Systems
      Although electrical engineering and computer
       engineering are considered different disciplines, it’s
       important to always remember that any complex
       electronic component includes both:
          Physical/electrical characteristics
              Such as power, current, inductance, capacitance, etc.
          And computation-related characteristics
              E.g., information content, logical function, software, protocols
      To successfully design working systems requires
       multidisciplinary teams that understand and can take
       care of the engineering considerations on both sides!
1/8/2010                     M. Frank, EEL3705 Digital Logic, Fall 2006           5
                           FAMU-FSU College of Engineering

                      What does a modern                                                      System-level
                   Digital Logic Designer do?                                                        Functional design

      Design engineering, in general,                                                        Functional or
       involves taking abstract, system-level                                                 specification
       requirements, and translating them into                                                       Structural
       ever more concrete and specific                                                        Schematic or
       designs for technological artifacts.                                                     structural
          Digital Logic Design is no different.
                                                                                                      Logic design
      In modern industrial practice,                                                          Gate-Level
       increasingly many of the steps of the                                     Design         Design
       design process have been automated.                                                           Circuit
          This is true for digital functions especially.                     FPGA           Transistor-level
              See e.g. resources at                                 Program           Schematics

      Today, computer-based tools do most                                       Loading              Layout

       of the “grunt work” and “heavy lifting”                              Configured      VLSI Mask Layers
          But, the designer has to understand what                                                   Fabrication
           the tools are doing in order to use them!
                                                                                              Physical chip
1/8/2010                       M. Frank, EEL3705 Digital Logic, Fall 2006                                        6
                          FAMU-FSU College of Engineering

               The Basis of Digital Logic today:
                       The MOSFET
      Nearly all digital systems
       today (2006) are based on an
       electronic device called the
          Metal-Oxide-Semiconductor
           Field-Effect Transistor
          This device is a voltage-
           controlled switch
      Two basic types of FET:
          nFET: The dominant charge
           carriers are electrons (negative)                                             gate
              Conducts low voltages well
          pFET: The dominant charge
           carriers are holes (positive)                                   source               drain
              Conducts high voltages well
                                                                           nFET icon used in schematics
1/8/2010                      M. Frank, EEL3705 Digital Logic, Fall 2006                                  7
                          FAMU-FSU College of Engineering

               Today’s Dominant Logic Style:
      Most logic today is done in the CMOS
       (Complementary MOS) logic style                                            Vdd (PWR)
          Each logic “gate” (hardware to do a given
           logic operation) is built using both nFETs
           and pFETs                                                        Vin   Vout
              nFETs pull output low, pFETs pull it high
          Uses energy mainly only when switching
      Here are a simple CMOS inverter
       circuit and its logic gate icon                                            Vss (GND)
          When input is high (1) output is low (0)
           and vice-versa.
          This and a few other simple gates are                           in     out = ¬in
           sufficient to build any digital system!

1/8/2010                      M. Frank, EEL3705 Digital Logic, Fall 2006                 8
                  FAMU-FSU College of Engineering

                 Course Overview
      Go through syllabus posted on Blackboard

1/8/2010             M. Frank, EEL3705 Digital Logic, Fall 2006   9
                      FAMU-FSU College of Engineering

                 Administrative Matters
      Sign the attendance sheet being passed
          Clearly print your preferred email address
      Pick up and sign a prerequisite form…
          Turn it in at the end of class
      Make sure you are enrolled on Blackboard
          Email Dr. Frank if you aren’t
      Download the Quartus II software
      Labs begin next week!
1/8/2010                 M. Frank, EEL3705 Digital Logic, Fall 2006   10
                           FAMU-FSU College of Engineering

            First-Day Homework Assignment
          To be completed by this Wednesday’s lecture
            No time to waste!
          The assignment is:
       1. Turn in the signed course prerequisite form to Dr. Frank
                Preferably, at the end of today’s lecture
       2. Ensure you are enrolled for the course on Blackboard
                Email instructor at immediately if not
       3. On your home or laptop computer, download & install the
           Quartus II software (web version)
                Available from (see link on Blackboard)

1/8/2010                       M. Frank, EEL3705 Digital Logic, Fall 2006   11