Circuit Design Process Troubleshooting Digital Electronics TM 1.3 Introduction to Digital Circuit Design Process Digital Electronics © 2014 Project Lead The Way, Inc. Project Lead The Way, Inc. Copyright 2009

Circuit Design Process Combinational Logic Design Process Digital Electronics  Word Problem - Identify and define the requirement specifications. What are the inputs? What are the outputs? Sometimes it is helpful to create a table that defines what is means for a specification to be “high” or “low”. Identify Circuit Types Required - What ICs are required and available for the design? Will any part of the circuit require an analog design? Is there combinational logic required? Is there sequential logic required? Is a clock signal needed? Do I have the necessary Datasheets? Pin diagrams? Truth Table for Combinational Logic Section Hand Calculations and Sketches of Initial Circuit Simulation Breadboard and Test Using Version #1 of the Combinational Logic Design Process, students will be able to design AOI based logic circuits from a given word problem. They will have the option to simplify the logic expression using Boolean algebra. Project Lead The Way, Inc. Copyright 2009

Circuit Design – Best Practices Combinational Logic Design Process Circuit Design – Best Practices Digital Electronics  Prototype and test the circuit incrementally. Don’t design and build the entire circuit only to find is does not work properly. It is easier to trouble shoot the circuit in sections rather than try and troubleshoot the complete circuit in its entirety. As you progress through this course, you will be introduced to advancements in technology and in the circuit design process itself. As you learn about these advancements you will be able to make even more choices that will help you design efficient circuits in shorter amounts of time. In this lesson we will learn about the circuit design process by exploring simple designs in combinational and sequential logic. Project Lead The Way, Inc. Copyright 2009

Combinational Logic Design Process Digital Electronics  Design Process Version #1 Word Problem Write Logic Expression Boolean Simplification AOI Logic Implementation Create Truth-Table NO Simplification Using Version #1 of the Combinational Logic Design Process, students will be able to design AOI based logic circuits from a given word problem. They will have the option to simplify the logic expression using Boolean algebra. Project Lead The Way, Inc. Copyright 2009

Combinational Logic Design Process Digital Electronics  Design Process Version #2 K-Mapping NOR Only Logic Implementation NAND Only Logic Implementation Word Problem Write Logic Expression Boolean Simplification AOI Logic Create Truth-Table NO Simplification Version #2 of the Combinational Logic Design Process adds two features to the design process. First, the students will be able to re-implement their AOI implementations into either NAND only or NOR only implementations, resulting in more efficient designs. Second, students will be able to utilize the Karnaugh mapping (K-Map) technique to simplify the logic expressions rather than using Boolean algebra. Project Lead The Way, Inc. Copyright 2009