How to pass multiple generics to vsim using -g switch in Modelsim?

Question

I'm trying to pass multiple VHDL generics to the testbench in Modelsim 10.7b using -g switch in the vsim command. How do I pass multiple generic where all the generics are defined in another string/file.

in short : When I use

set generics "-gHEIGHT=1 -gWIDTH=2" vsim $generic work.test only the first generic, i.e., HEIGHT is getting changed. WIDTH is not getting the value 2. It remains at the value initialised at the entity.

test.vhd file:

library IEEE;
use IEEE.std_logic_1164.all;

entity test is

  generic (
    HEIGHT : integer := 0;
    WIDTH  : integer := 0);

  port (
    clk : in std_logic);

end entity test;

architecture arch of test is

begin  -- architecture arch



end architecture arch;

used commands to run the sim :

vlib work
vmap work work
vcom test.vhd
set generics  "-gHEIGHT=1 -gWIDTH=2"

vsim command where both generics are passed to the vhdl file successfully using -g switch :

vsim -gHEIGHT=1 -gWIDTH=2 work.test

vsim command where only first generic in the string generic is passed to the vhdl..i.e only HEIGHT is passed:

vsim $generics  work.test

I'm trying to pass multiple (~10) generics from python via vsim command. So I cannot list the generics name in the vsim command which executes the simulation.

Schelte Bron · Accepted Answer · 2019-12-02 15:40:32Z

4

To pass multiple arguments contained in a single variable to a command, expand the variable using {*}:

vsim {*}$generics work.test

answered Dec 2, 2019 at 15:40

Schelte Bron

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3 Comments

maximus Over a year ago

Thanks. That worked! Just an additional question, do you happen to know how do I pass other arguments of the vsim. For example : vsim -wlf test.wlf -c -do run.do doesn't actually creates a wlf named test.wlf. I had to add it as vsim -wlf test.wlf work.test

Schelte Bron Over a year ago

Sorry, I don't have a clue about modelsim. Your first question was really just plain Tcl, which is why I was able to answer that.

user_007 Over a year ago

@Rakend in your first vsim command in your comment (vsim -wlf test.wlf -c -do run.do), you don't specify a design unit, like you do in the second command (vsim -wlf test.wlf work.test), where work.test is the library and design unit. Maybe that's why it didn't create a WLF, because it didn't know what design unit to simulate.

user_007 · Accepted Answer · 2019-12-02 17:20:15Z

1

As an alternative, you can use the -f argument to the vsim command and specify a file containing various vsim arguments, including generic arguments. E.g.:

vsim -f arg_file.txt

Then your file (arg_file.txt in this case) can contain your generic arguments or whatever else you might need:

-gHEIGHT=1 -gWIDTH=2

answered Dec 2, 2019 at 17:20

user_007

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Comments

maximus · Accepted Answer · 2019-12-02 15:41:19Z

0

It worked with eval "vsim $generics work.test"

Even though Modelsim evaluates this statement and displays it as vsim -gHEIGHT=1 -gWIDTH=2 work.test on command execution, looks like vsim parser is not taking this as an argument.

answered Dec 2, 2019 at 15:41

maximus

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