Logisim-Evolution

The latest, stable release Logisim-Evolution can be downloaded here. To help the project or try out the newest features & bugfixes, the nightly build is can be used.

The installation process is easy to follow and the program can be used for digital logic design straight away.

If you encounter any issues, taking a look at the Wiki can be worth it, discussing it with the professor or open a new issue.

FPGA Tools Path Setup

Important: Before you can proceed with the setup, ensure that you have Intel Quartus Prime installed on your machine as written in the Intel Quartus Tool Guide.

• Click the File menu and hit Preferences to open the Preferences.

• Select the Software tab. To change the Altera/Intel Quartus toolpath, click on Browse and navigate to the binaries of your Quartus installation.

Downloading Logisim Circuits to FPGA

Downloading a Circuit Design onto the FPGA is straight-forward with Logisim, but ensure that you have completed the previous step first.

For this demonstration, a very basic design using a button as user input, a clock source and AND gate, and finally a LED as user output.

• Navigate to the FPGA menu and click on Synthesize & Download.

• The Synhesize & Download window should open. First, configure the Target board to the LEGUAN FPGA board.

• Using the Frequency drop-down menu, you can select the clock speed of the clock source in the logisim circuit. You can also set the clock settings by the Divider value, and use a fraction of the 125 MHz base clock.

• Before the circuit can be synthesized, the input and output components need to be labeled, which can be done in the circuit editor. To ensure all components without a label are labeled, click Annotate.

• To synthesize and load the design onto the FPGA board, click Execute while Synthesize & Download is selected in the Action method.

• Whenever Synthesize & Download is executed, the user will be requested to check the component mapping window.

• By clicking an unmapped component, the available input or output is highlighted on the FPGA board image. By clicking one of the dark-blue highlighted components on the image, the schematic component will be connected to the FPGA button, LED or I/O.

• Once components are mapped, click Done to confirm and close the window. The synthesis will be done from here on and may take a short moment.

• After the circuit has been synthesized without errors, the following window will pop up. Ensure that the FPGA is connected to the computer and hit Yes, download.

• The circuit will be downloaded onto the FPGA board and the LED should be blinking if the button is pressed.