# Lab 1: Intro to Logic Simulation

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Lab 1: Intro to Logic Simulation
Minimum Submission Requirements
● Your Lab1 folder must contain the following files:
○ Lab1.lgi (note the capitalization for both the file name and extension)
● Commit and push your repository
Note
You should have created the Lab1 directory and a blank README file in the last lab
assignment.
Lab Objective
This lab will introduce you to a schematic entry logic simulation program, Multimedia
Logic. In this lab you will practice creating truth tables and implementing logic
based on those truth tables.
Tutorial
Before starting the lab assignment, follow the tutorial listed in the Help menu.
Resources

For the Extra Credit

Template
Start working from the template provided on canvas. You must use senders and
receivers such that the output is shown on the first page of the template. Do not
change the first page of the schematic file, except for the text
fields – your name, CruzID, and descriptions of the outputs. Additional wires and
logic circuits shall be drawn on subsequent pages of your Multimedia Logic schematic.
Remember to rename the template file to Lab1.lgi.
Note
Some operating systems capitalize the extension and will save the file as Lab1.LGI.
You must rename this file to have the extension .lgi (in all lowercase).
Lab 1 Page 1 of 6 Spring 2019
© 2019, Computer Engineering Department, University of California – Santa Cruz
Specification
Part A
The given template has input switches in_3, in_2, in_1, and in_0. Considering the
input switch in_3 as the most significant bit, connect the wires from the user input
switches to the 7 segment display component.
Part B
Consider the switches as a 4-bit binary number.
Design a circuit that turns ON the “b_0” LED when the switches indicate an even
number.
Design a circuit that turns ON the “b_1” LED when the switches indicate a value of 12
(base 10) or more.
Sample Output
b_0 is OFF when the input is odd number b_0 is ON when the input is even number
Lab 1 Page 2 of 6 Spring 2019
© 2019, Computer Engineering Department, University of California – Santa Cruz
b_1 is OFF when the input is 0 – 11 b_1 is ON when the input is 12 – 15
Part C
Implement the truth table below using either Sum of Products (SOP), Product of Sums
(POS), or another method. Output the result on the LED connected to receiver c_0.
Then, implement the same truth table using only NAND gates. Output this result to the
LED connected to receiver c_1. Assume an ON LED represents “1” and an OFF LED
represents “0.” Lastly, build the same circuit from using only NOR gates. Output the
result to c_2.
in_2 in_1 in_0 | c_0
0 0 0 | 0
0 0 1 | 1
0 1 0 | 1
0 1 1 | 0
1 0 0 | 0
1 0 1 | 0
1 1 0 | 1
1 1 1 | 1
Extra Credit
In the template, you are given a 7 segment display made of individual LEDS on the
second page. Implement the logic required to have this display represent the two’s
complement number based on user input.
Lab 1 Page 3 of 6 Spring 2019

Simulation
To ensure the circuit simulates without error, make sure there is at least one
receiver for every sender and that each receiver has exactly
one sender. In addition, do not modify the canvas size.
If you do not have at least one receiver for every sender or if you have more than
one sender with the same name, your circuit will not simulate and you will miss all
points for the output meeting the specification.
Each page of your Multimedia Logic schematic should be labeled with your last name,
first name, and CruzID (the name used in your UCSC email address). Label each circuit
with a description of the functionality and the part of the lab that it is for.
Visual Structure
Presentation of information is an important part of deliverables. Clean
documentation is easy to comprehend and looks professional. Your circuits
should be structured in an organized method that is easy to read and interpret. Using
the “Snap to Grid” setting under the View menu makes it easy to line up components. A
clean circuit uses many senders and receivers with meaningful names, and has no wires
crossing over each other. Note that there may be multiple receivers for one sender.
See below for examples of messy and clean circuits.
Lab 1 Page 4 of 6 Spring 2019
© 2019, Computer Engineering Department, University of California – Santa Cruz
Messy Circuit Example
Clean Circuit Example
This file must be a plain text (.txt) file. For full credit, it should contain your
first and last name (as it appears on Canvas) and your CruzID. Your answers to the
questions should total at least 150 words. Your README should adhere to the following
template:
————————
LAB 1: Intro to Logic Simulation
CMPE 012 Fall 2018
Last Name, First Name
CruzID
————————-
What did you learn in this lab?
Write the answer here.
Lab 1 Page 5 of 6 Spring 2019

What worked well? Did you encounter any issues?
Write the answer here.
How would you redesign this lab to make it better?
Write the answer here.
What external resources did you use to complete this lab?
(Not including course materials)
Did you work with anyone on the labs? Describe the level of collaboration.
Missing Wire Best Practices
MML has a known bug which causes some wires to disappear during the save
process. To reduce the likelihood of this occurring, DO NOT use the
“Node” tool (it’s a black dot located at the top-right of the tool
palette). This tool is particularly vulnerable to the bug.
If this bug occurs, the grader will attempt to repair the missing wire
in your file. This is only possible if your circuit is very readable.
Make sure that wires do not cross whenever possible. Wire paths should
be short and direct. Use receivers liberally.
Lab 1 Page 6 of 6 Spring 2019

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