18.104.22.168.1. Global Router Congestion Hotspot Summary Report
The Global Router Congestion Hotspot Summary report shows congested net hotspots in your design by hierarchical node name.
A global routing congested region is an area of the FPGA where short wire usage in a particular direction exceeds the capacity of that region. A congested net is a net that passes through a congested region.
If the congested area is small, detailed routing can recover by detouring around these overused regions. However, if the congested area is large, you most likely encounter a no route. The exact threshold where that happens varies greatly depending on the design.
Use the Global Router Congestion Hotspot Summary report to identify parts of your RTL code that are associated with routing congestion.
The Global Router Wire Utilization Map provides a visualization of the Global Router Congestion Hotspot Summary Report.
If the size of adjacent congested regions is below a threshold, the report shows the threshold and size of the largest congested region instead of a hierarchical report of congested nets.