Simulation

Proposal of a simulation script system. All simulation files of a certain bloc can be found besides the src directory in the sim directory.

It needs to have at least 4 files

Filename	Description
<blocname>_tb.vhd	Main Simulation Testbench Toplevel
modelsim.ini	Modelsim configuration file with all necessary settings
sim_main.do	Modelsim main simulation script
sim_wave.do	Modelsim waveform file containing the needed waveforms

Configuring

Testbench

First configure the testbench accordingly to your simulation.

• Constants
• Generics
• Sequence
• etc ...

sim_main.do

The sim_main.do contains a user defined part and the rest will be the same for ever testbench. You only need to change the user changable part (see below).

Variable	Description	Example
work_path	Path for all intermediate files. Can be anywhere, best is in a temporary folder	C:/temp
sim_path	Path of the project sim folder you want to simulate	C:/work/Project/.../.../.../sim
wave_file	wave file to load after compilation	sim_wave_all.do
sim_time	simulation time	10 ms, 10 us, 10 sec, -all
file_list	list of all files to compile. Relative to the sim directory Libraries Subfiles Mainfiles Testbenchfiles	see below
toplevel	Name of toplevel bloc (Main Testbench bloc	interpolator_tb

Example

#-------------------------------------------------------------------------------
# User changable parameters
# --
set work_path C:/temp/ricoh/ri_gen5/interpolator/work
set sim_path c:/work/project/Ricoh/2_FPGA/RI_GEN5/ip/interpolator/sim
set wave_file sim_wave.do
set sim_time "5 ms"

# filelist according to $simpath
set file_list {
                ../Interpolator_defs_pkg.vhd

                ../PulseGenerator.vhd
                ../RampCounter.vhd
                ../HwEncoder.vhd
                ../Interpolator.vhd

                Interpolator_tb.vhd
}

# Set toplevel entity
set toplevel interpolator_tb
# --
# END User changable parameters
#-------------------------------------------------------------------------------

sim_wave.do

There can be a lot of different wvaeform files. In the sim_main.do you need to specify which one should be used. The waveform file needs to be created with modelsim.

• Add all the waves you want
• Configure the for each signal and it's display parameters
• Save the waveform file in the sim directory

Launch simulation

• Open Modelsim and enter the following

  do C:/work/project/location/to/you/folder/sim/sim_script.do
  

• After compilation there will be a question in modelsim console to start the simulation.

  # Launch Simulation <Y|N y|n>