What is the difference between ModelSim and QuestaSim?

Questa is Mentor’s flagship product that has full System Verilog simulation support. Modelsim is an older product that has limited support for System Verilog. If you plan on using OVM/UVM then you would want to go with Questa, otherwise Modelsim is good enough.

How do I force a signal on ModelSim?

STEP 9: A List window will appear to the right of Object window. Now we want to assign values to the input signal in the design. This is done by forcing the value. To force a value to an input signal, right click on the signal and select ‘force’ (figure 13).

What is difference between freeze deposit and force?

force -deposit command When none of these is specified, then -freeze is assumed for unresolved signals and -drive is assumed for resolved signals. This is designed to provide compatibility with force files. But if you prefer -freeze as the default for both resolved and unresolved signals.

How do I force a signal in VHDL?

The force command allows you to apply stimulus interactively to VHDL signals and Verilog nets. Since force commands (like all commands) can be included in a macro file, it is possible to create complex sequences of stimuli. You can force Virtual signals (UM-248) if the number of bits corresponds to the signal value.

Do scripts ModelSim?

The script will compile every file the first time. Subsequent recompiles will run through the list of files looking for a file that has been modified since the last compile time. The modified file and every file after it in the list will be recompiled.

Do file in QuestaSim?

do extension (that is, < file name >. do)….To perform a functional simulation with the QuestaSim software with command-line commands

1. From the Mentor Graphics® QuestaSim main window, chose Execute Macro.
2. In the Execute Do File dialog box, locate your QuestaSim macro file (. do).
3. Click Open.

How much does ModelSim cost?

Additional Development Tools

What is automatic task?

Automatic Tasks A re-entrant task is one in which the items declared within the task are allocated upon every individual call of the task, as opposed to being shared between all calls of the task. This could be a problem in a simulation environment if code is forked and calls the same task at the same time.

What is the difference between wire and reg?

wire elements must be continuously driven by something, and cannot store a value. Henceforth, they are assigned values using continuous assignment statements. reg can be used to create registers in procedural blocks. Thus, it can store some value.

How do I compile in QuestaSim?

To compile libraries and design files with the QuestSim GUI:

1. If you have not already done so, set up a project with the QuestaSim software.
2. On the Compile menu, click Compile.
3. In the Library list of the Compile HDL Source Files dialog box, select the work library.
4. In the Files of Type list, select All Files (*.

How do I run ModelSim?

1. In order to run your simulation, you need to create a project. Click File -> New -> Project.
2. Click on Add Existing File as shown in the picture to the right.
3. To start your simulation, click on Simulate in the Menu Bar, then click Start Simulation.
4. Here is your waveform window.

How to create a simulation in ModelSim-Altera?

To generate the ModelSim-Altera automation script (.dofile), start the ModelSim- Altera software, and then compile the design files, follow these steps: 1. On the Processing menu, point to Start,and then click Start Analysis & Elaboration. Figure 1–1. Simulation Page (Settings Dialog Box)

How are force commands used in ModelSim se?

CR-176 Commands ModelSim SE Command Reference force The force command allows you to apply stimulus interactively to VHDL signals and Verilog nets. Since force commands (like all commands) can be included in a macro file, it is possible to create complex sequences of stimuli.

How is the TR anslation controlled in ModelSim?

The tr anslation is controlled by the translation table in the pref.tcl file. If ModelSim cannot find a translation for 0 or 1, it uses the left bound of the signal type (type’left) for that value. CR-178 Commands ModelSim SE Command Reference Examples force input1 0 Forces input1 to 0 at the current simulator time. force bus1 01XZ 100 ns

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