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Description of the stimuli

The stimuli used for the simulation are described in a `Stimuli` method. This method is a Python function generator that is automatically called by the `Testbench` method to generate all the stimuli. As a Python function generator, the `yield` instruction have to be used at the end of each stimuli computation.

### Affect value to signals

The method `affect` permits to affect a value to a given signal as follow

    self._stim.affect(self.Ck,0)

### Add stimuli

The method `add` permits to finish a step of simulation by add all the values to the current stimuli

    self._stim.add()

Subsections

- - Affect value to signals
  - Add stimuli