Simulink stateflow condition for single pulse input

How do I generate a single pulse in SImulink??

I want to give a single pulse source to a subsystem only when a certain condition is met. When I try doing it using simulation time, it has already given the input pulse. I want it to be activated only when the condition is met. Can this be done using Stateflow or Matlab function??

I just need a single pulse, But I get like continuous pulse, when I keep i as local variable and define it as 0 initially.

I want to define i as global so that after 3 iterations it goes back

Any help is appreciated. Thank you,

Answer 1

[Birdman]

Try the attached model. Note how the inside of Stateflow is built.