Congestion Level Ranges - 2023.1 English

UltraFast Design Methodology Guide for FPGAs and SoCs (UG949)

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2023.1 English

When analyzing congestion, the level reported by the tools can be categorized as shown in the following table.

Note: Congestion levels of 5 or higher often impact QoR and always lead to longer router runtime.
Table 1. Congestion Level Ranges
Level Area Congestion QoR Impact
1, 2 2x2, 4x4 None None
3, 4 8x8, 16x16 Mild Possible QoR degradation
5 32x32 Moderate Likely QoR degradation
6 64x64 High Difficulty routing
7, 8 128x128, 256x256 Impossible Likely unroutable