Gated D Flip-Flop

• The D (data) flip-flop has a single input that is used to set and to reset the flip-flop.
• When the gate is high, the Q output will follow the D input.
• When the gate is low, the flip-flop is latched.

A simple rule for the D latch is:

      Q follows D when Enabled.

 

Notice that the Enable is not active during the grey areas, so the output is latched.

 

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