The Clock Domain Crossings (CDC) report performs a structural analysis of the clock domain crossings in your design. You can use this information to identify potentially unsafe CDCs, which will lead to metastability or data coherency issues. While the CDC report is similar to the Clock Interaction Report, the CDC report focuses on structures and their timing constraints, but does not provide information related to timing slack.
When run from the Tcl console, the CDC report can be scoped to one or more hierarchical cells using the -cells option. If the CDC is scoped, checks are reported when either the source or destination pins are inside the list of hierarchical cells. The scoping option is not available from the Report CDC GUI.