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Digital Logic Design Laboratory, Cheat Sheet of Information Technology

International University - VNU-HCMInformation Technology

A detailed laboratory guide for students studying electrical engineering at international university. The guide covers the investigation of basic logic gates (not, and, or, xor, nand, nor) using simulation software, the derivation of other logic gates using universal gates (nand & nor), and the design and simplification of combinational logic circuits using logic gates and ics. The guide includes truth tables, circuit diagrams, and instructions for implementing circuits via simulation software.

Typology: Cheat Sheet

2021/2022

Uploaded on 04/15/2024

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Digital Logic Design Laboratory 1-21
INTERNATIONAL UNIVERSITY
SCHOOL OF ELECTRICAL ENGINEERING
Digital Logic Design Laboratory
Lab 1
Introduction Simulation
Software and Logic Gates
Full name: ……NGUYỄN HOÀNG GIANG………….
Student number: …………ITITIU22046….
Class: ………GROUP …07…………….......
Date: …………27/03/2024……………....
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SCHOOL OF ELECTRICAL ENGINEERING

Digital Logic Design Laboratory

Lab 1

Introduction Simulation

Software and Logic Gates

Full name: ……NGUYỄN HOÀNG GIANG………….

Student number: …………ITITIU22046….

Class: ………GROUP … 07 …………….......

Date: …………27/03/2024……………....

SCHOOL OF ELECTRICAL ENGINEERING

I. Objectives

In this laboratory, students will study:

  • Familiar with simulation software
  • Understand the operation of logic gates.
  • Build a combination circuit that implements a Boolean expression.
  • Use IC designing circuit which is satisfied the below truth table.

II. Procedure

  1. Investigate Logic Gates

Investigate the basic logic gates by using simulation software

a. NOT gate

  • One input of NOT gate wire up to switch.
  • Output wire up to led-display
  • Toggle switch to change input logic level.
  • Get the results and write down the truth table of NOT gate.

A

Y=

Low 1

High 0

Implement the circuit via simulation software and paste the result in here

A

SCHOOL OF ELECTRICAL ENGINEERING

c. OR gate

  • Two inputs of OR gate wire up to switches.
  • Output wire up to led-display
  • Toggle switch to change input logic level.
  • Get the results and write down the truth table of OR gate.

A B Y= A+B

Low Low 0

Low High 1

High Low 1

High High 1

Implement the circuit via simulation software and paste the result in here

d. XOR gate

  • Two inputs of XOR gate wire up to switches.
  • Output wire up to led-display
  • Toggle switch to change input logic level.
  • Get the results and write down the truth table of XOR gate.

SCHOOL OF ELECTRICAL ENGINEERING

A B Y= A⊕B

Low Low 0

Low High 1

High Low 1

High High 0

Implement the circuit via simulation software and paste the result in here

e. NAND gate

  • Two inputs of NAND gate wire up to switches.
  • Output wire up to led-display
  • Toggle switch to change input logic level.
  • Get the results and write down the truth table of NAND gate.

A B

Y= 𝑨𝑩

Low Low

Low High

High Low

High High

Implement the circuit via simulation software and paste the result in here

SCHOOL OF ELECTRICAL ENGINEERING

  1. Changing gate method

Using universal gate (NAND & NOR gate) to derive other logic gates

a. Using NAND to make other logic gates

  • Construct the circuit for each figure 1
  • Output wire up to led-display
  • Toggle switch to change input logic level.
  • Get the results and write down the truth table of figure 1a.
  • Do the same steps for figure 1b, 1c, 1d.

74LS00 74LS

74LS

74LS

74LS

74LS

74LS

74LS

74LS

74LS

  • Which do these circuits in figure 1a, 1b, 1c, 1d correspond with logic gates?

Truth table and correspond with logic gates of Figure 1b

A B Y (Output)

Figure 1a

Figure 1b

Figure 1c

Figure 1d

SCHOOL OF ELECTRICAL ENGINEERING

Implement the circuit via simulation software and paste the result in here

Truth table and correspond with logic gates of Figure 1c

Implement the circuit via simulation software and paste the result in here

A B Y (Output)

SCHOOL OF ELECTRICAL ENGINEERING

b. Using NOR to make other logic gates

  • Construct the circuit for each figure 2
  • Output wire up to led-display
  • Toggle switch to change input logic level.
  • Get the results and write down the truth table of figure 2 a.
  • Do the same steps for figure 2 b, 2 c, 2 d.

74LS

74LS02 74LS

74LS

74LS

74LS

74LS

74LS

74LS02 74LS

  • Which do these circuits in figure 2 a, 2 b, 2 c, 2 d correspond with logic gates?

Truth table and correspond with logic gates of Figure 2 b

Implement the circuit via simulation software and paste the result in here

A B Y (Output)

Figure 2a

Figure 2b

Figure 2c

Figure 2d

SCHOOL OF ELECTRICAL ENGINEERING

Truth table and correspond with logic gates of Figure 2 c

Implement the circuit via simulation software and paste the result in here

Truth table and correspond with logic gates of Figure 2d

A B Y (Output)

A B Y (Output)

SCHOOL OF ELECTRICAL ENGINEERING

Implement the circuit via simulation software and paste the result in here

Using K-map to simplify function above

The simplified 𝑭𝟏(𝑨, 𝑩, 𝑪) = C + 𝑨

. B

Implement the new expression via simulation software and paste the result in here

SCHOOL OF ELECTRICAL ENGINEERING

b. Given the circuit below, find the function 𝑭𝟐

Write down the function 𝑭𝟐

= (AB+𝑪

Fill in the truth Table:

A B C F 2

Implement the circuit via simulation software and paste the result in here

SCHOOL OF ELECTRICAL ENGINEERING

Write down the function 𝑭𝟑

⊕ (C+D)

Fill in the truth Table:

A B C D F 3

Implement the circuit via simulation software and paste the result in here

SCHOOL OF ELECTRICAL ENGINEERING

Using K-map to simplify function above

The simplified 𝑭𝟑

+ ABC

Implement the new expression via simulation software and paste the result in here

SCHOOL OF ELECTRICAL ENGINEERING

The simplified expression is 𝒇(𝑪, 𝑩, 𝑨) = 𝑪

Implement the circuit via simulation software and paste the result in here

SCHOOL OF ELECTRICAL ENGINEERING

b. Only Using NOR gates in IC 74HC02 to construct the circuit for expression

𝑪𝑩𝑨

The simplified expression is 𝒇(𝑪, 𝑩, 𝑨) = C + BA

Implement the circuit via simulation software and paste the result in here