Simulink stateflow condition for single pulse input

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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,

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Birdman
Birdman 2021-1-26
Try the attached model. Note how the inside of Stateflow is built.

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