The Simulation Player toolbar appears when you select Debug in the Build toolbar.
See Debugging Block
Displays the current step of the simulation. This field can also be used to set a target step. Fill in the step number and click Enter, the simulation runs until the step is reached.
Reset the simulation. The simulation goes back to the initial step. The signals are not emitted. The values of the signals and ports are reset.
Run simulation for 1 step.
Run the simulation infinitely, until you click Pause or until a breakpoint is reached.