Congestion - 2021.2 English

Vivado Design Suite User Guide: Design Analysis and Closure Techniques (UG906)

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2021.2 English

The report_design_analysis command reports several congestion tables which show the congested area seen by the placer and router. You can generate these tables using the following command in the same Vivado tools session where the placer and router were run:

report_design_analysis -congestion

The following figure shows an example of the congestion tables which are equivalent to placer final and router initial congestion.

Figure 1. Estimated Congestion Tables

The names provided for the Module Names correspond to the hierarchical cells present in each reported Tile. You can retrieve the complete name using the following command:

get_cells -hier <moduleName>

Once the hierarchical cells present in the congested area are identified, you can use congestion alleviating techniques to try reducing the overall design congestion.