1. EEL 3705 / 3705L Digital Logic Design
Fall 2006 Instructor: Dr. Michael Frank
11/15/2018
M. Frank, EEL3705 Digital Logic, Fall 2006

2. M. Frank, EEL3705 Digital Logic, Fall 2006
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
11/15/2018
M. Frank, EEL3705 Digital Logic, Fall 2006

3. What do we mean by “Digital Logic Design?”
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
11/15/2018
M. Frank, EEL3705 Digital Logic, Fall 2006

4. 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
11/15/2018
M. Frank, EEL3705 Digital Logic, Fall 2006

5. 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!
11/15/2018
M. Frank, EEL3705 Digital Logic, Fall 2006

6. What does a modern Digital Logic Designer do?
System-level requirements
Functional design
Design engineering, in general, involves taking abstract, system-level requirements, and translating them into ever more concrete and specific designs for technological artifacts.
Digital Logic Design is no different.
In modern industrial practice, increasingly many of the steps of the design process have been automated.
This is true for digital functions especially.
See e.g. resources at eda.org
Today, computer-based tools do most of the “grunt work” and “heavy lifting”
But, the designer has to understand what the tools are doing in order to use them!
Functional or behavioral specification
Structural design
Schematic or structural specification
Logic design
Gate-Level Design
Design compiler
Circuit synthesis
FPGA Program
Transistor-level Schematics
Loading
Layout
Configured FPGA
VLSI Mask Layers
Fabrication
Physical chip
11/15/2018
M. Frank, EEL3705 Digital Logic, Fall 2006

7. The Basis of Digital Logic today: The MOSFET
Nearly all digital systems today (2006) are based on an electronic device called the MOSFET
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)
Conducts low voltages well
pFET: The dominant charge carriers are holes (positive)
Conducts high voltages well
gate
source
drain
nFET icon used in schematics
11/15/2018
M. Frank, EEL3705 Digital Logic, Fall 2006

8. Today’s Dominant Logic Style: CMOS
Most logic today is done in the CMOS (Complementary MOS) logic style
Each logic “gate” (hardware to do a given logic operation) is built using both nFETs and pFETs
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
When input is high (1) output is low (0) and vice-versa.
This and a few other simple gates are sufficient to build any digital system!
Vdd (PWR)
Vin
Vout
Vss (GND) in
out = ¬in
11/15/2018
M. Frank, EEL3705 Digital Logic, Fall 2006

9. M. Frank, EEL3705 Digital Logic, Fall 2006
Course Overview
Go through syllabus posted on Blackboard
11/15/2018
M. Frank, EEL3705 Digital Logic, Fall 2006

10. Administrative Matters
Sign the attendance sheet being passed around…
Clearly print your preferred address
Pick up and sign a prerequisite form…
Turn it in at the end of class
Make sure you are enrolled on Blackboard
Dr. Frank if you aren’t
Download the Quartus II software
Labs begin next week!
11/15/2018
M. Frank, EEL3705 Digital Logic, Fall 2006

11. 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
instructor at immediately if not
3. On your home or laptop computer, download & install the Quartus II software (web version)
Available from altera.com (see link on Blackboard)
11/15/2018
M. Frank, EEL3705 Digital Logic, Fall 2006