Hi,
I try to set and reset a variable on different (alternating) clocks. The first clock should set the variable, the second clock should reset it again. The shift between the clocks determines the pulse duration.

block RowAddress



  Clock clk1=Clock(10);

  Clock clk2=shiftSample(clk1,10,100);

  Boolean active(start=false);



initial equation 

equation 

  when clk1 then

   active = true;

   elsewhen clk2 then

   active=false;

   end when;

 

end RowAddress;

Openmodelica says: "Clocked when equation can not contain elsewhen part."
(In Dymola this gives an "Unknown internal error in Dymola")

When I split the when into two independent sections

block RowAddress



  Clock clk1=Clock(10);

  Clock clk2=shiftSample(clk1,10,100);

  Boolean active(start=false);



initial equation 

equation 

  when clk1 then

   active = true;

   end when;

   when clk2 then

   active=false;

   end when;

 

end RowAddress;

I get from openmodelica: "Too many equations, over-determined system. The model has 6 equation(s) and 5 variable(s)."
(From dymola I get: the model is structurally singular  ("The Boolean part has 4 unknowns and 5 equations." seems to be the problem, although I don't understand what these 4 booleans are),)

Now I assume the second option must be wrong because modelica cannot assume that the events will not occur simultaneously (although they are definitely in this case).

Is this solvable, and how?

Best regards,
Paul