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It’s only open for enrollment a few times each year. VHDLwhiz Membership - The FPGA learning experience that never ends If you’re interested in the membership and the monthly premium tutorials, you can read more about it here: We’re setting up a script-based design flow for VHDL projects, and to do that, we have to understand how the ModelSim batch mode commands work.
#Modelsim series
I made this write-up now because I’m teaching it in this month’s tutorial series for the members. (Thanks to Rafael from the comment section for that tip!) The VHDLwhiz Membership
#Modelsim pdf
* Or you can access it from within ModelSim by clicking: Help -> PDF Documentation -> Reference Manual. It’s 455 pages long and lists all the possible ModelSim commands along with their optional switches. If you want to dig deeper into these and other ModelSim commands, I recommend checking out the * ModelSim Reference Manual.
#Modelsim Manual Pdf
Check out the video above for an example! ModelSim Reference Manual PDF The exit command in ModelSim has a “-code” switch that lets you do this.
#Modelsim code
If you start a batch mode simulation from a script or a Makefile, you may want to return an exit code that you can pick up in your script. When you now call vmap or any other command that relies on the INI file, it will use the local copy of modelsim.ini. Then you can set an environment variable pointing to this file: set MODELSIM=/modelsim.ini But a better strategy is to use the system’s modelsim.ini file as a template and copy it to your local folder by using the special “-c” switch: vmap -c If you make the INI file writable, vmap will happily modify it. There’s one in the ModelSim installation directory, but it’s often not writable without admin privileges. Or you can delete a library mapping by typing: vmap -del lib_nameįinally, you should know that vmap modifies your modelsim.ini file.
#Modelsim update
You can add or update a mapping by typing: vmap lib_name path/to/the/lib/folder Other libraries like work will probably map to the current working directory “./work”. The standard libs are probably located in your ModelSim installation directory as they came with the simulator. That will print a list of library mappings from which you may recognize some names from. To list all mappings, type vmap without arguments: vmap Using the vmap tool, you can view and edit the mapping between the VHDL library name and the path to the compiled VHDL code in your file system (the folder you created with vlib and compiled into using vcom). Check out the ModelSim Reference Manual for a comprehensive list of all the options. The vcom command has lots and lots of optional arguments that allow you to control the compilation rules in detail. Let’s create the work library manually using vlib: vlib workĪnd delete it using the vdel command: vdel -all -lib work For example, the compiled code belonging to the work library usually resides in a subfolder named “work”. Unless you specify a different location, each design library will appear as a folder in your project folder. If you create a new VHDL project in the GUI, it will automatically create it for you. But the VHDL code you write must also go into a design library.
You’ve probably used libraries like ieee or std in your VHDL code before. vlibĮverything starts with the vlib command, which creates a design library. The location may differ among installations, but in any case, it’s the subfolder that contains the vsim and vcom executables you want to add to the path. Some ModelSim installers update the path automatically, while on other systems, you must set it manually. To run a command in batch mode, the program must be in the path of your shell. You can run the commands manually by typing them in the console from within the ModelSim, but you can also run them as standalone programs from a terminal without starting the GUI. The screenshot below shows the command echoed to the transcript window after we click the Compile button. For example, when you click the Compile button in the ModelSim GUI, it runs the vcom command back-end. I regard the graphical user interface (GUI) as a front-end for the commands listed in this article. I think that’s unnecessary because the basic workflow isn’t hard to learn. Many people struggle to understand the ModelSim/QuestaSim VHDL simulator’s workflow.
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