I think you can generation a line waveform to time and try with the mod() function in the math_real package

hi,
I think there is a tricky solution for this,
see this
Code:

signal   pulse_signal : voltage := voltage_max;



begin

  if domain = quiescent_domain or domain = time_domain use
    v == pulse_signal'ramp(period-flybacktime, flybacktime);
  else
    v   == ac_spec;				-- used for Frequency (AC) analysis
  end use;

process
begin
   loop
    pulse_signal <= pulse;
    wait for (period-flybacktime);
    pulse_signal <= initial;
    wait for (flybacktime);
  end loop;
end process;

end architecture ideal;
 

Now take into consideration to declare the variables I used well
please if is there is something please post,
Amrsfmt