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In sample-based mode, you have to activate the setting by changing the pulse type parameter to sample-based mode.  In sample-based mode, the block will compute its output at fixed intervals that is specified by the user.  A crucial difference between the sample-based mode and time-based is that in time-based mode, the output of the block is based  on the simulation time and in sample-based mode, the output of the block output will depend only on the simulation start and the block supports reset semantics.

In time-based mode, simulink computes the output of the block only when the output changes.  This leads to fewer computations for the output of the block over the simulation time period.  In time-based mode, depending upon the pulse waveform features, the intervals between changes in the block output will differ.  For the same reason, a time-based pulse generator block will have a variable sample time.

In time-based mode, simulink computes the output of the block only when the output changes.  This leads to fewer computations for the output of the block over the simulation time period.  In time-based mode, depending upon the pulse waveform features, the intervals between changes in the block output will differ.  For the same reason, a time-based pulse generator block will have a variable sample time.

Fathima, visit https://in.mathworks.com/help/simulink/slref/signalgenerator.html