Verilog Test Bench Example
In addition to the files i also put the test bench and both verilog modules appended into one file on eda playground so you can run them live in a browser.
Verilog test bench example. However the verilog you write in a test bench is not quite the same as the verilog you write in your designs. Testbench for this listing is shown in listing 9 6 and the waveforms are illustrated in fig. The mod m counter is discussed in listing 6 4.
A test bench is actually just another verilog file. In this section we will combine all the techniques together to save the results of mod m counter which is an example of sequential design. Examples stepwise implementation of writing a testbench in verilog we are now familiarized with the elements that we use to write a testbench in verilog.
It invokes the design under test generates the simulation input vectors and implements the system tasks to view format the results of the simulation. Let us look at a practical systemverilog testbench example with all those verification components and how concepts in systemverilog has been used to create a reusable environment. These ensure that outputs get set before the test bench samples inputs.
2 a verilog hdl test bench primer generated in this module. This is because all the verilog you plan on using in your hardware design must be synthesizable meaning it has a hardware equivalent. Test benches a test bench supplies the signals and dumps the outputs to simulate a verilog design module s.
So let s explore how we can write the verilog testbenches of some basic combinational and sequential circuits. The outputs of the design are printed to the screen and can be captured in a waveform viewer as the simulation runs to monitor the results.