Placer Final Congestion Reporting - 2025.2 English - UG906

The Placer Final Congestion Reporting table identifies congested areas in the device, defined by the congestion window, and lists the modules located in those areas. The resource usage percentages indicate the types of resources present in the congested region.

1. Open the Placer Final Congestion Reporting table for your design.
2. Check for high LUT usage.
3. If high LUT usage exists, examine the instances that have a high percentage of LUT6s in the Complexity report.
4. If the congested area has high RAMB or DSP utilization, check for Pblock constraints that limit the available placement area of the reported modules.
5. Use targeted placement directives to relieve congestion, such as BlockPlacement or SpreadLogic.
6. In some cases, reuse the RAMB or DSP placement from a previous run that showed low congestion and good Timing QoR.
7. Use the report to examine areas of the device defined by the Congestion window along with the modules residing in that window.
8. Use the resource usage percentages to understand the types of resources located in the congested area.

The following figure shows an example of the Placer Final Congestion Reporting table. This report highlights areas of the device defined by the congestion window, lists the modules in those areas, and shows resource usage percentages to indicate the types of resources in the congested region.