Observe the timing waveform of D flip-flop and how to adjust the trigger level.

1. When observing the timing waveform of D flip-flop, the adjustment of trigger level usually needs to adjust the input port of flip-flop.

2. When it is a positive logic D flip-flop, it is necessary to connect the input port to the level flip-flop and adjust the level of the level flip-flop to adjust the trigger level.

3. When it is a negative logic D trigger, it is necessary to connect the input port to the inverter and adjust the level of the inverter to adjust the trigger level.

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