Calling ModelSim commands from SystemVerilog

Question

Is there a way to call a ModelSim command (e.g. force -freeze) from SystemVerilog?

Could you expand your example, are you trying to do some thing like : initial begin #2m force -freeze end — Morgan
– Morgan, Commented Aug 12, 2014 at 13:27
yes, I'd expect something like: initial begin #2m $simulator("force -freeze /tb/i_dut/some_signal 0 0"); end — Andy
– Andy, Commented Aug 12, 2014 at 13:36

dave_59 · Accepted Answer · 2014-08-12 15:31:02Z

2

There is a package mti_fli that you can import lets you call modelsim commands using the SystemVerilog DPI. Look in "Simplified Import of Library Functions" in the User Manual.

However for large designs, I would strongly recommend using Verilog's force statement directly for performance reasons. Anytime you have to look up a signal by string name at run time prevents many optimizations to keep those names available.

answered Aug 12, 2014 at 15:31

dave_59

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2 Comments

Andy Over a year ago

Does the verilog's force command work when the DUT is written in VHDL? I've tried it already and it failed, but maybe I just did something wrong.

dave_59 Over a year ago

No, that's the first you mentioned using VHDL. Using $signal_force or mti_Command() will work with VHDL.

Tudor Timi · Accepted Answer · 2014-08-12 14:33:24Z

0

If you just want to force a signal, you can use the $signal_force system task. Have a look in the ModelSim manual on its input parameters.

answered Aug 12, 2014 at 14:33

Tudor Timi

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