Lab 15 - FL13 - ECE 198 JL - University of Illinois - Engineering Wiki

Lab 15 - FL13 - ECE 198 JL - University of Illinois - Engineering Wiki

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Lab 15 - FL13 This lab is to be done in the EWS computer lab (DCL 440, DCL 520, etc.). Working on it remotely is not advisable as there are numerous technical difficulties in getting the software to work properly with remote access. Plan your time accordingly. This lab is due on Wednesday, December 11, in lecture. LC-3 Microprogramming Overview and objectives During this lab, you will learn a little bit about how we implement the LC-3 architecture in VHDL. First, you will debug a buggy version of the LC-3 architecture. Then, you will add a new instruction NEG to the LC-3 architecture. Finally, you will write a short program to demonstrate that you have correctly debugged the architecture and that your new instruction works correctly. Due to the complexity of the LC-3 architecture, this lab may take a little longer than previous labs, so it may help to start early! Getting Started In this section, you will download the LC-3 library lab7_lib (we apologize for the odd name, but this lab used to be lab7 in a previous course and it is very difficult to change the name of a library). Create a "lab7" directory in your ECE 198 directory Download the LC-3 libary to your lab7 directory (lab7.zip ) Unpack the library with the command unzip lab7.zip to create a "lab7_lib" directory If necessary, move your lab7_lib directory so that its path is /home/[YOUR_NETID]/[YOUR ECE 198 DIRECTORY]/lab7/lab7_lib. Open HDL designer and create a new project called "lab7". Set the path of the project to /home/[YOUR_NETID]/[YOUR ECE 198 DIRECTORY]/lab7/ and set the library to use "lab7_lib". Make sure that you include the last /. Click next twice and then choose "Open the Project" and click Finish. When you create this project, it should become populated with all the files you need. If not, delete the lab7.hdp file in your lab7 folder and try the directions above again. Debugging the LC-3: Repairing a Broken Microinstruction In this part of the lab, we will show you how to navigate parts of the LC-3 architecture and show you how to modify its control words (microinstructions). We have written a program in the LC-3 architecture that executes the instruction ADD R0, R6, 5. Since R6 is first loaded with the value x300D before we execute the ADD R0, R6, 5 instruction, this instruction should load R0 with the value x3012. As you will see, this instruction contains a bug. Starting the simulation In Design Manager window you should see several components in the lab7_lib library that compose the LC-3 architecture. Locate the CPU component. Feel free to open the component and other components to explore if you are curious, but we will focus on simulating the CPU as a whole. Select the CPU component Start the simulator. If ModelSim won't start or if you get errors after you open ModelSim, please scroll to the bottom of the instructions to the Troubleshooting section.
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Lab 15 - FL13 - ECE 198 JL - University of Illinois - Engineering Wiki

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