A max delay constraint with -datapath_only has
been applied between <pin_name> and
<pin_name>. The startpoint(s) and endpoint(s) either belong
to the same clock domain or belong to two clock domains that can safely be timed
together. It is only recommended to use the -datapath_only option on paths between clocks that do not have a known
phase relationship. This DRC is waived when a synchronizer is found on the path
endpoint.