A configurable flip-flop circuit has modifiable connections between its circuit elements that allow it to be modified for primary and secondary uses. For example, the flip-flop circuit can be modified to provide secondary functions of NOR and NAND gates during an implementation of an ECO. At other times, the flip-flop circuit can be used to deliver normal flip-flop functionality. A configurable latch circuit is provided that can be modified to provide an output signal or an inverted output signal. A scan circuit is provided that can provide the functionality of a multiplexer.