Testbench generator

Give me your verilog code, I will give you a testbench for it.

How to use?

Make sure you have python on your system.

python tbgen.py input_verilog_file_name [output_testbench_file_name]

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Author: Xiongfei(Alex) Guo xfguo@credosemi.com

License: Beerware

Updates by Al Williams (Hackaday)

I made a few changes:

1. Put a placeholder timescale up front. If you want to change back to the old behavior you can rename print_module_head_orig to print_module_head (and delete the current one) or at the bottom change print_module_head to print_module_head_orig.
2. Generate a reset if reset is detected.
3. Put comments in the generated file.
4. Put an include for your user-generated code. This is important because if you change the generated file and regenerate it, you'll lose your changes.
5. Changed $dumpvars to level 2
6. Added a simple example
7. Added command line options

Nothing major, and -- of course -- this is just a template to get you started but don't forget that any changes you make will be clobbered if you regenerate the testbench!

Example

python tbgen.py top.v top.tb.v
iverilog top.tb.v top.v -o top
vvp top
gtkwave tb_output.vcd

Or try http://edaplayground.com if you don't want to install iverilog and gtkwave.

Command line

usage: tbgen.py [-h] [-p PERIOD] [-t TIMESCALE] [-d DUMPFILE] [-l LEVEL] [-r]
                input_file [output_file]

Automatically generate Verilog testbench

positional arguments:
  input_file            input Verilog file
  output_file           output Verilog testbench

optional arguments:
  -h, --help            show this help message and exit
  -p PERIOD, --period PERIOD
                        set period in clock ticks (default=10)
  -t TIMESCALE, --timescale TIMESCALE
                        set timescale (default=1ns/10ps)
  -d DUMPFILE, --dumpfile DUMPFILE
                        set dumpfile (default=tb_output.vcd)
  -l LEVEL, --level LEVEL
                        set dump depth level (usually 0,1, or 2; default=2)
  -r, --resetneg        set reset to negative (default positive)			    
  -i INCLUDE, --include INCLUDE
                        sets user include file name (default=user.tb_<name>.v)