Configurable-Precedence NOR R-S Latch

This is an enhancement to the circuit "NOR Reset-Set Latch With Precedence". With the addition of three more two-input NOR gates the circuit can be easily configured to have the priority swapped between nRESET and nSET. nRESET is an active-low reset input and nSET is an active-low set input. A third input PRCTL (Precedence/Priority Control) selects which between nRESET and nSET has precedence over the other. When PRCTL is 0 nRESET has precedence over nSET, when PRCTL is 1 nSET has precedence over nRESET.