ECE 2020 Digital Design

Last time

• Last time
  • Multiplexer design
• To be effectively prepared for today you should have:
  • Read your notes, planned watching the asynchronous lecture on encoders
• Homework 5
  • due Monday November 17, 2025
  • Covers design with more complex gates
• Winter is coming…
  • 6 lectures left
  • 2 homework assignments
  • 1 Exam in class on Wednesday November 19, 2025
  • 1 Final exam
  • 1 lab
• Be ready!
  • Take your quizz at 10:15am

Design with Multiplexers

• We can use multiplexers to implement Boolean functions of \(n\) variables
  • Method 1: use a \(2^n\times 1\) MUX
  • Method 2: use a \(2^{n-1}\times 1\) MUX

Demultiplexers

• Functionally, opposite of a multiplexer

Adders

• Two basis building blocks
  • Half adder
  • Full adder

Subtractors

Comparators