What is Meant by the "Setup Time (15 ns Typical) With Respect to the Edge of the Logic Trigger?"

The following statement "setup time (15 ns typical) with respect to the edge of the logic trigger" referes to the amount of time in which the combination conditions of the logic input must be met before the detection of the edge trigger of the analog input. For example, the combination of conditions of logic input for the relevant edge must be met at least 15 ns before edge detection.