Correct Answer: Suppose your flip-flop is positive edgetriggered time for which data should be stable prior to positive edge clock is called setup is called setup time constraint Time for which data should be stable after the positive edge of clock is called as hold time constraint If any of these constraints are violate d then flip-flop will enter in meta stable state, in which we cannot determine the output of flip-flop there are two equation: 1 Tcq + Tcomb > Tskew + Thold 2 Tcq + Tcomb > Tskew + T - Tsetup Tcq is time delay when data enters the flip flop and data comes at output of flip flop Tcomb is the logic delay between two flip flop Tskew is the delay of clock to flip flop: suppose there are two flip flop, if clock reaches first to source flip flop and then after some delay to destination flip flop, it is positive skew and if vice versa then negative skew so if you take 2 eq you will see that setup time is the determining factor of clock's time period
