The Global Clocks tables report the type of loads in each clock region for each global clock net, as well as timing clock information and the clock track ID used to route the clock net. When sorting the table by Global ID in the Vivado IDE, the clock regions where each global clock net is routed can easily be identified and highlighted in the device by simply selecting the corresponding table rows.
The column description is the same as in the Clock Primitive Utilization, Global Clock Resources, and Global Clock Source Details tables.
For UltraScale devices, the Global ID of clock nets routed over a clock region without driving any loads are tagged with a "+" character, as shown in the following figure.
Figure 1. Report Clock Utilization – Clock Region Cell Placement Example