ID:12240 Synthesis found one or more imported partitions that will be treated as black boxes for timing analysis during synthesis

CAUSE: The design has one more imported partitions or hierarchies defined in a Quartus Prime Exported Partition File (.qxp). During Timing-Driven Synthesis and Physical Synthesis, these partitions and hierarchies are treated as black boxes, which means that timing of any paths across boundaries of these partitions and hierarchies will not be taken into account. This only affects Synthesis.

ACTION: No action is required. It is recommended that imported partitions and hierarchies defined in Quartus Prime Exported Partition Files have registers on the boundaries, and that there are no timing-critical paths crossing these boundaries.