\nus to use ModelSim. The command for the environment choices is cad<\/b>. The command must
\nbe entered twice.
\nTo select ModelSim choose option 2 <\/b>(Mentor Graphics 2018 EDA version).<\/p>\n
Another important note to remember is that ModelSim To start the program you must insert command<\/p>\n vsim &<\/b><\/p>\n The & in the end of the command shows that the program is run in the backround and the Figure 1. ModelSim main view.<\/p>\n You need to tell the simulator where to find the lab directory containing your design files. For that:<\/p>\n To compile your design you can either create a new project and compile the files A compilation library is a directory on your disk into which all HDL designs are compiled. Figure 2. Creating a new library.<\/p>\n Now lets compile the design. For example we’ll take the lab1 mux.vhd VHDL file.<\/p>\n Figure 3. Compiling source files.<\/p>\n Creating a new project:<\/p>\n After a new project creation a new tab Project<\/b> appears in the Workspace<\/b> window. Figure 4. Creating a project.<\/p>\n Figure 5. Adding files to project.<\/p>\n With double click on the design file in Workspace<\/b> window you open the content of this file in the Source Code Editor.<\/p>\n You can compile either all files together or every file separately.<\/p>\n Compiling separately:<\/p>\n Compiling together:<\/p>\n If your design contains errors, you’ll see the message [file name] failed with n error(s). # ERROR: file_name(line_number): description…<\/p>\n With double click on the error message ModelSim will open the source file in its Source Code Editor at the error line.<\/p>\n To invoke the simulator:<\/p>\n Another way is according to Figure 6.<\/p>\n Figure 6. Simulation starting.<\/p>\n The “loading…” message will appear in the main window to confirm that the files Usually windows Workspace, Objects and Wave are used during simulation (Figure 7).<\/p>\n You can also open other individual windows under View<\/b> menu.<\/p>\n Figure 7. Simulation view.<\/p>\n The design’s hierarchy can be traversed in the workspace window under tab sim<\/b>.<\/p>\n For debugging purposes you can view signals within your design in the objects window. The waveform window displays the signals’ current value as well as any history.<\/p>\n To add the signals into the Wave window:<\/p>\n You can run the simulation for a set amount of time by typing run X<\/b> in the command Command run<\/b> without specifying the time will execute simulation for the Observe the behaviour of the design in the waveform display. You can zoom in and zoom out of The simulation can be restarted to time 0 using the restart<\/b> command. When this happens, The simulation time will be set back to zero. Note that the signals are still listed in the waveform display, but the When you have finished simulating:<\/p>\n The command line can be used as an alternative to the pull-down menus of the Create a physical compilation directory with vlib<\/b>:<\/p>\n To compile VHDL design files you vcom<\/b>:<\/p>\n Start the simulator with vsim<\/b> on the topmost design unit:<\/p>\n Use view<\/b> to open all or selected window of the simulator interface:<\/p>\n Use add wave<\/b> to add selected signals, or all the signals in the selected region The simulation is started by typing run X<\/b> in the main window, where X is the Restart keeping all the current display formats:<\/p>\n When you have finished simulating quit the simulator:<\/p>\n Before we start In the lab class we need to luckyladyschoose the configuration for the environment jack and the beanstalk slot machine which allows us to use ModelSim. The command for the environment choices is cad. The command must be entered twice. To select ModelSim choose option 2 (Mentor Graphics 2018 EDA version). Another important […]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":1269,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":[],"_links":{"self":[{"href":"http:\/\/priit.ati.ttu.ee\/index.php?rest_route=\/wp\/v2\/pages\/2033"}],"collection":[{"href":"http:\/\/priit.ati.ttu.ee\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"http:\/\/priit.ati.ttu.ee\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"http:\/\/priit.ati.ttu.ee\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/priit.ati.ttu.ee\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2033"}],"version-history":[{"count":11,"href":"http:\/\/priit.ati.ttu.ee\/index.php?rest_route=\/wp\/v2\/pages\/2033\/revisions"}],"predecessor-version":[{"id":2743,"href":"http:\/\/priit.ati.ttu.ee\/index.php?rest_route=\/wp\/v2\/pages\/2033\/revisions\/2743"}],"up":[{"embeddable":true,"href":"http:\/\/priit.ati.ttu.ee\/index.php?rest_route=\/wp\/v2\/pages\/1269"}],"wp:attachment":[{"href":"http:\/\/priit.ati.ttu.ee\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2033"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
\ndoesn’t support CTRL+s<\/b> shortcut.<\/span><\/p>\nStarting ModelSim<\/h3>\n
\npromt is returned immediately. It means that to run another process you don’t have
\nto open a new command line window. You can use &<\/b> behind every process command.<\/p>\n![\"ModelSim\"](\"ModelSim\/1main.PNG\" "\\"ModelSim\\"")
<\/p>\nSpecifying the simulation directory<\/h3>\n
\n
Compiling the design<\/h2>\n
\nin the project or just compile every file without creating a project. Somewhat
\neasier is to create a new project. This gives you the chance to open the project
\nlater without any need to specify the files in there or the library used.<\/p>\nOption1: Compilation without project creation<\/span><\/h3>\n
Creating a compilation library<\/h4>\n
\nYou can specify this library through the ModelSim or it can be created using operation system
\ncommands. Usual library name is work<\/b>. Now lets create a directory called work<\/b>
\nand map the directory to the logical library named work<\/b>.<\/p>\n\n
![\"ModelSim\"](\"ModelSim\/2library.PNG\" "\\"ModelSim\\"")
<\/p>\nCompiling your design<\/h4>\n
\n
![\"ModelSim\"](\"ModelSim\/3compile.PNG\" "\\"ModelSim\\"")
<\/p>\nOption2: Compiling with project creation<\/span><\/h3>\n
\n
\nProject Location<\/b> field.<\/li>\n
\ninto which all HDL designs are compiled. The default library name is work<\/b>. It is better to
\nleave it with a default name.<\/li>\n<\/ul>\n
\nThis shows the list of the files of the current project.<\/p>\n![\"ModelSim\"](\"ModelSim\/4project.PNG\" "\\"ModelSim\\"")
<\/p>\nAdding an existing design file to the project<\/h4>\n
\n
\nchoosing appropriate radio button.<\/li>\n
\nthis means thtat the file is not yet compiled.<\/li>\n<\/ul>\n![\"ModelSim\"](\"ModelSim\/5add.PNG\" "\\"ModelSim\\"")
<\/p>\nAdding a new design file to the project<\/h4>\n
\n
\nthe column of the status<\/b>,
\nthis means that the file is not yet compiled.<\/li>\n<\/ul>\nCompiling your design<\/h4>\n
\n
\n
\nWith double click on this line the exact message of errors appears in the following format:<\/p>\nSimulation<\/h3>\n
Starting the simulator<\/h4>\n
\n
![\"ModelSim\"](\"ModelSim\/6simulation.PNG\" "\\"ModelSim\\"")
<\/p>\n
\nhave loaded correctly. If you receive an error message asking to re-compile the testbench design, then you
\nhave compiled the files in the wrong order.<\/p>\nOrganizing the display<\/h4>\n
\n
![\"ModelSim\"](\"ModelSim\/7wave.PNG\" "\\"ModelSim\\"")
<\/p>\nViewing your design<\/h3>\n
Travesing the design hierarchy<\/h4>\n
Displaying signals and waveform window<\/h4>\n
\n
Controlling the simulation<\/h3>\n
Running simulation<\/h4>\n
\nline of Main window, where X is the number of nanoseconds that you wish to run for.
\nIn example run for 100 ns:VSIM > run 100 ns<\/b><\/p>\n
\ndefault amount of time. You can set the default run period:<\/p>\n\n
Using the waveform display<\/h4>\n
\nthe view of waveforms by clicking right mouse button and choosing the appropriate option. Also you can see the waveforms on the whole screen:<\/p>\n\n
Restart the Simulation<\/h4>\n
\nthe simulator reloads any re-compiled design files in the libraries. In this case,
\nas you have just re-compiled your edited source code into the work library, the simulator
\nwill restart using the modified code.<\/p>\n\n
\nprevious waveforms are no longer displayed.<\/p>\nQuitting the simulator<\/h4>\n
\n
Command line operation<\/h2>\n
\nGraphical User Interface for scripting and batch-mode operation. Only simple
\ncommand syntax is shown here. The Command Reference guide in the docs directory of the ModelSim
\ninstallation contains full details.<\/p>\nCommands<\/h3>\n
Creating a compilation library<\/h4>\n
\n
Compiling your design<\/h4>\n
\n
Starting the simulator<\/h4>\n
\n
Simulator User Interface<\/h4>\n
\n
Add signals in the waveform window<\/h4>\n
\nto the waveform viewer.<\/p>\n\n
Running the simulation<\/h4>\n
\nnumber of nanoseconds that you wish to run for:<\/p>\n\n
Restart simulation<\/h4>\n
\n
Quitting the simulator<\/h4>\n
\n