Department of Physical Science and Engineering
Engineering Program
Welcome to Introductory Digital Logic Design!
EGR2440 - Digital Logic Design
Number LE01
Fall 2011

INSTRUCTOR: Dr. Scott D. Johnson, Associate Professor, Engineering Coordinator, Physical Sciences and Engineering


OTHER LOCATIONS: CH-100 (Department), the classroom proper, and the Cyber Cafe

PHONE NUMBERS: 301-322-0420 (Department Main Line) or 301-386-7536 (Office)


To facilitate e-mail communication with me, please include the following code: CCGP07 along with the course designation (EGR 2440) in the subject of any e-mails to me during the Fall 2011 semester. (The code stops legitimate e-mail messages from being evaluated wrongly as SPAM but does not allow e-mails that contain a virus or illegal attachment into our network.)

Example: EGR2440: Need help on VHDL: CCGP07

All credit students (with the exception of Howard Community College students enrolled at Laurel College Center) are required to use Owl Mail for all college communication.



OFFICE HOURS: MW 7:15-8:30pm, TTH 2:15-3:30pm, by appointment all other times

Note: Part or all of the office hours might be in the classroom (CAT-305) as student questions warrant.


To understand modern electrical circuits a thorough understanding of digital circuits is necessary. This course works towards that goal by introducing the student to the theory and practice of logic (digital) circuits.

Material that is covered includes but is not limited to the following subjects: Number systems and base conversions, Boolean algebra, truth tables,logic circuits, logic circuits synthesis and implementation, Karnaugh maps (and other strategies of minimization), sequential logic, flip-flops, registers, counters, processors (simple), programmable logic devices, and characteristics of logic families. Some physical hardware is discussed including limitations.

This course emphasizes the elements used to create logic circuits and the software (CAD/EDA) used to design and simulate logic circuits.

Team work along with communication skills (oral, written, and graphical) are exercised throughout the course.


PHY 1030, MAT 2420, and EGR 1010


Upon successful completion of the course a student will be able to

  1. Describe and apply fundamental circuit elements in a design of a simple logic circuit.

  2. Identify and describe logic building blocks.

  3. Demonstrate the ability to understand specification sheets.

  4. Effectively design, build, and analyze logic circuits (combinational and synchronous at a minimum).

  5. Use a simulation tool to design and analyze the performance of a logic circuit of moderate complexity.

  6. Sketch a digital system design of complex logic circuit.

  7. Demonstrate the ability to write and execute a timing simulation.


Fundamentals of Digital Logic with VHDL Design with CD-ROM 3rd Edition.  Brown, Stephen and Vranesic, Zvonko.  McGraw-Hill (2008).
Schaum's Outline of Digital Principles 3rd Edition.  Tokheim, Roger L.  McGraw-Hill (1994).

Recommended books:

Pocket Book for Technical Writing for Engineers and Scientists 3rd Edition .  Finkelstein, Leo.  McGraw-Hill (2007).


  1. Pens, Pencils, Eraser, Straight edge, Paper, Textbooks, and Calculator are required for every class.


As with any class an amount of time at least equivalent to two times the credit hours is expected to be performed for homework and labs. Please allot sufficient time for homework.

Homework will be assigned each week including the first week.


Evaluation of student performance is to be based on:

  1. Unannounced quizzes and homework will account for approximately 25% of the semester grade. Homework consists of essays that are to be written in standard English format and problem sets.

  2. Two (mid-term and final) comprehensive in-class tests on digital circuits will account for approximately 25% (each) of the semester grade. All work is subject to re-grade if academic dishonesty is suspected.

  3. A design logic project with associated report will account for approximately 25% of the semester grade. This project is to be an original individual work. A grade of zero will be given to anyone who copies their projects. All work is subject to re-grade if academic dishonesty is suspected. Turn work in on time.


Students are expected to attend and participate in class activities. Students who either never attended the class or who ceased attendance during the first 20 percent of the course will be assigned a "Q" grade by the instructor. The Q grade is a final grade and will not be replace with a different grade at a later time. Although the Q grade will not impact students' GPA, the issuance of a Q grade will likely decrease students' financial aid awards.

Faculty are required to report the date of last attendance for each student receiving Q or F grade(s) in order for the college to report this date to a variety of federal agencies as mandated. The date of last attendance is considered the date of the student's termination from the course, regardless of the date of grade submission. Early termination from a course may result in reduction in student loans and financial aid (e.g., Pell, VA benefits) and may require the student to reimburse funds to the funding agency.


  1. Homework is due at the start of class (or before) except for in-class projects.

  2. Laboratory work is to be submitted in appropriate binders follow any standard laboratory format (this will be reviewed in class).

  3. Make-up homework, quizzes, and/or tests are up to the discretion of the teacher (excused absences only). No makeup will be possible for laboratory work, sufficient time should be available to recover if an absence is necessary.


New topics are to be covered each week and include but are not limited to the following subjects. This outline is subject to change.

Week 1 Digital Design

Week 2 Logic Circuits

Week 3 CAD/VHDL coding (instructional; expected to use after this)

Week 4 Implementation Technology

Week 5 Logic function optimization

Week 6 Arithmetic Circuits

Week 7 Multiplexers, Decoders, Encoders, and other logic circuit building blocks

Week 8 Flip-flops, registers, counters, and other logic circuit building blocks

Week 9 Synchronous Sequential Circuits

Week 10 Asynchronous Sequential Circuits

Week 11 Digital System Design: Putting it all together

Week 12 Digital System Design (state diagrams)

Week 13 Testing of Logic Circuits (+project help)

Week 14 Testing of Logic Circuits (+project help)

Week 15 CAD/EDA Tools

A new chapter should be read each week usually following the title of the topic above. Problems will be based off of the reading.

Quizzes will all be unannounced so be prepared.

Tests will be announced a week before and will depend on our progress in the classroom.


  1. Food and drink in limited quantities (snacks, not meals) are permitted in restricted areas (not near electronics) and will be revoked if proper cleanliness is found wanting.

  2. Cell phones must be in vibrate mode and are only to be answered for emergencies (step outside please).

  3. Common courtesy is to apply at all times.


First Day of classes (Canceled -- Flooding and Earthquake (5.8)

Mon., August 29

First Day of classes

Wed., August 31

Labor Day - College closed - No classes

Sat.-Mon., September 3 - September 5

Last day to apply for fall graduation

Thurs, September 15

Last day to change from "audit to credit" or "credit to audit" for full-semester classes

Friday, September 23

Midterm - middle of semester; class will speed up

Wednesday, October 19

College Enrichment Day - No classes (for students)

Tuesday, October 25

Last day to withdraw from full-semester classes

Friday, November 18

Thanksgiving Break Start - No classes

Wed., November 23

College closed - no classes

Thurs.-Sun., November 24-27

Last Day of Classes

Thursday, December 8

Final exam period/last week of classes

Wednesday, December 14 (6:00pm)

Open Registration begins (Engineers should register NOW)

December 1

Winter Break - College closed

Thursday-Wednesday, December 22 - January 4

Registration begins (Engineers should have registered already...if you have not; do it NOW)

Thursday, January 5

Classes begin Spring 2011

Monday, January 23


Computer programming maybe done in class (CAT-305) on the portable PCs during designated time periods.