AN-1029 Adding nSET/nRESET to DFF's

A D Flip-Flop (DFF) with nRESET or nSET captures the value of the D-input, usually at the rising edge of the clock (CK) input. That captured value becomes the Q output. At other times, the output Q does not change. The nRESET or nSET input is used for resetting the device to its initial state. Both nRESET / nSET input types are active LOW, but nRESET initializes Q output to LOW, while nSET initializes Q HIGH. If a DFF cell had no nRESET / nSET inputs available, this design example shows how to add them.


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