VHDL BLOG: How to write VHDL test bench.
Hi All, Is there a way to create testbench files specific to a VHDL module (automatically created declaration and instantiation scripts for the hdl unit under test and related signals), just like we have been using in ISE? Thanks in advance, Onder Tatar.
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Since testbenches are written in VHDL or Verilog, testbench verification flows can be ported across platforms and vendor tools. Also, since VHDL and Verilog are standard non-proprietary Application Note: Test Benches XAPP199 (v1.1) May 17, 2010 Writing Efficient Testbenches Author: Mujtaba Hamid R.
You would create a SV testbench and instantiate your RTL, whether it be Verilog, SystemVerilog, or VHDL, inside it. Then use the DPI to interface with your C test program. See here for more information.
In this case you may end up writing a basic VHDL test bench and wish you could use some of the nice features from UVM. Luckily you are not alone and you are not the first. Some people have even put together some helpful libraries and frameworks to help you achieve a better test bench in pure VHDL.
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In case of sequential units under test, a clock signal should be supported in the testbench. Typically, it is realized as a separate process in the testbench architecture. In order to stop the simulation with a testbench, stimuli are often specified inside a process which contains a non-conditional wait statement at the end; such statement suspends the execution of the testbench forever.