ECS 154A: Computer Architecture Project 1

Due August 16, 2024 at 9:00 PM

This project description is subject to change at anytime for clarification. For this project you will be working alone.

Desired Outcomes

•   Exposure to using circuit simulator (Logisim Evolution)

•   Exposure to gray codes

•   Exposure to seven segment displays

•   An understanding of how to develop simple combinatorial logic circuits

Project Description

You will be using a digital logic simulator called Logisim Evolution available at https://github.com/logisim-evolution/logisim evolution/releases for this project. For this project you can only use components under the Wiring and Gates sections. You will be given a starter circuit that provides a testing main circuit.   Submit a README.md with your circuit file compressed together in a tgz (tar gzip) file. Your README file must have your name, SID number, a brief description of what circuits work/don’t work, and a list of sources you used for designing of your circuit (you do not need to list the book or lecture notes it is assumed these have been used). Any allowed use of Generative AI must be properly documented.  

1.   Use Logisim Evolution to design a circuit to do a three-bit unsigned comparison of two values.  Use X2, X1, X0 and Y2, Y1, Y0 as inputs.  Outputs should be E and N.  E is true if X = Y and N is true if X < Y. Use the following naming convention:

Inputs:   X2 X1 X0

Y2 Y1 Y0

Outputs:      E  N

Circuit: Compare

2.   Use Logisim Evolution to design a circuit to convert a 4-bit binary value into a 4-bit Gray code. In a Gray code successive values differ in only one bit. Your Gray code will be based upon the last digit of you SID. Use the following naming convention:

Inputs:   B3 B2 B1 B0

Output:   G3 G2 G1 G0

Circuit: Gray

3.   Use Logisim Evolution to design a circuit to convert a five-segment counting rod like encoding to a seven-segment display output. The counting rod numbering looks as follows:

Make sure to get all correct encodings of vertical and horizontal lines to the seven-segment display. For example V W X as true and W X Y as true are both valid encodings for 3, as are V W Y and V X Y.

Figure 1. Five Segment Display

Figure 2. Seven Segment Display

Inputs:   V W X Y Z

Output:   A B C D E F G

Circuit: FiveSeven

You can unzip the given tgz file with utilities on your local machine, or if you upload the file to the CSIF, you can unzip it with the command:

tar -xzvf proj1given.tgz

You must submit the circuit file, README.md file, and.git directory in a tgz archive. You can tar gzip a directory with the command:

tar -zcvf archive-name.tgz directory-name

You should avoid using existing circuits as a primer that are currently available on the Internet. You MUST specify in your README.md file any sources of circuits that you have viewed to help you complete this project. You MUST properly document ALL uses of Generative AI following the guidelines outlined in the Generative AI Restrictions. All class projects will be submitted to MOSS like software to determine if students have excessively collaborated. Excessive collaboration, or failure to list external code sources will result in the matter being referred to Student Judicial Affairs.