Dear All,

I am hoping my problem is an interest for the forum. I have just been registered to our community and I wonder if I could have a tip on the following issue.

My code is as follow:
electrical in;

parameter real V_th=0.0;
parameter real ttol=10p;
parameter integer dir=1;
parameter integer flag_start=0;

real t1, v_meas;

analog begin

   @(cross(V(in)-V_th,dir,ttol)) begin
     t1=$abstime;
     flag_start <= 1;
//      $strobe("time: %g", t1);
   end
   
   @(timer(t1, 1u)) begin
     if (flag_start==1) begin
       v_meas = V(in);
       $strobe("value: %e", v_meas);
     end
   end

This veriloga breaks the simulation with the message I have put in the subject. What I would like to implement is an event based on the outcome of an other. If I remove the condition "if", the two events are running without any issue but the second event is not waiting t1 value to be affected before to start.

Thanks for your feedback and remarks,
Fabian

Hi Goeffrey,

This line is to change the flag value once the first even is true. The second event could then to effectively something as the if statement become true with the flag equal to 1.

So should I change my line to be

integer flag_start=0;

or should I initialize under initial bengin end

Regards,
Fabian

Hi Geoffrey,

Thanks is work.

My code looks like now
electrical in;

parameter real V_th=0.0;
parameter real ttol=10p;
parameter integer dir=1;
parameter integer flag_start=0;

real t1, v_meas;

analog begin

  @(cross(V(in)-V_th,dir,ttol)) begin
    flag_start = 1;
  end
 
  @(timer(0, 1u)) begin
    if (flag_start==1) begin
      v_meas = V(in);
    end
  end

What I do not understand it is why I have to start an event (@timer ) from 0us and do nothing until the flag is true instead of having this event starting from a time t1 as shown in my first code.

Thanks Fabian

Thanks it works.

I understand that I need to put t1=$abstime+10n instead of t1=$abstime; otherwise the event @timer does not start.

Thanks it closed the issue, I believe.