Hello,

I begin in VHDL-AMS and I try to use the software SMASH.

I wrote a little program. When I compil it, I have one warning :

"WARNING: signal 'COUPLE' is not driven by any gate or process output."

What is the matter ?

This is my program :

>>> VHDL

library IEEE;
use IEEE.math_real.all;
use IEEE.mechanical_systems.all;
use IEEE.std_logic_1164.all;

ENTITY car IS
     GENERIC (M:mass:=1500.0);
     PORT (SIGNAL couple : IN REAL);
END ENTITY;

ARCHITECTURE behav OF car IS
     CONSTANT roue: real:=0.2;
     QUANTITY acc : acceleration ;
     QUANTITY vitesse : velocity ;
BEGIN
     acc == couple/(M*roue);
     vitesse'dot == acc;
END ARCHITECTURE behav;

ENTITY TB IS
END;
use WORK.ALL;
ARCHITECTURE One OF TB IS
SIGNAL couple : real ;
BEGIN
     voituretest : ENTITY car (behav)
     PORT MAP (couple);
     couple <= 50.0;
END ARCHITECTURE One;

You're right. the signal couple is in a process in TB.

I changed that and the warning disappear.

Thank you very much for your help.