In this example, we will monitor all of the signals in the test bench.
![]() Modelsim Version Free For YourThis tutorial explains first why simulation is important, then shows how you can acquire Modelsim Student Edition for free for your personal use.Simulation allows the designer to stimulate his or her design and see how the code that they wrote reacts to the stimulus.A great simulation will exercise all possible states of the design to ensure that all input scenarios will be handled appropriately.
Did you forget an if statement somewhere Did you remember to give every possible case statement assignment These are the types of errors that are very easy to make when you do not simulate your design. Modelsim Version License From MentorNote that you will need to request a license from Mentor Graphics. Modelsim Version License Request FormAt the end of the installation you must select Finish and a browser window will open with the License Request form. Clicking on an existing license request link from your browser bookmark or from a link posted on the web will not work. The actual code is not important, so if you are learning Verilog thats OK You dont need to know VHDL for this tutorial. The VHDL code creates a simple And Gate and provides some inputs to it via a test bench. Copy the code below to andgate.vhd and the testbench to andgatetb.vhd. Choose a location for your new project and give it the name andgate. Projects in Modelsim have the file extension.prj. Leave the other settings to their default. This just says that all code will be compiled into the library work. Click on Add Existing File as shown in the picture to the right. Navigate to the location where you downloaded andgate.vhd and andgatetb.vhd and add both of those to your project. See those two blue question marks in the Modelsim Project Window Figure above That means that Modelsim has not compiled the files yet. To do this, right click on andgate.vhd, click on Compile, then click on Compile All. You should see messages in the Console window appear in green that the compile was successful as shown in the screenshot below. Click on the plus sign next to work, then click on the plus sign next to andgatetb. Make sure you select andgatetb and not andgate as we want to simulate the design at the test bench level. Now, the majority of the time that you use Modelsim will be spent looking at the waveform view. The waveform view contains waves (binary 0s and 1s, hexadecimal digits, binary digits, enumerated types, etc) for all of the signals in your design. The next figure shows you what your waveform view looks like, but first you need to add some signals to monitor.
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