The clock interaction report indicates whether or not each pair of interacting clocks has a common primary clock source. Clock pairs that do not share a common primary clock are frequently asynchronous to each other. Therefore, it is helpful to identify these pairs by sorting the columns in the report using the Common Primary Clock field. The report does not determine whether clock-domain crossing paths are or are not designed properly.
report_cdc Tcl command for a
comprehensive analysis of clock domain crossing circuitry between asynchronous clocks.
For more information on the
report_cdc command, see
this link in the
Design Suite User Guide: Design Analysis and Closure
Techniques (UG906). Also, see report_cdc in the
Design Suite Tcl Command Reference Guide (UG835).