This is a modification of "NOR Reset-Set (RS/R-S/SR/S-R) Latch". Two additional NOR gates were used so that the circuit now includes an active-low ENABLE function.
When the enable input (nG) is low the nRESET and nSET input can control the Q and NOTQ output just as in the NOR Reset-Set (RS/R-S/SR/S-R) Latch. When nG is high nRESET and nSET are inhibited from controlling the output of the latch, Q and NOTQ simply retain their previous states.
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