Congestion Metrics for 7 Series and UltraScale Device Families - 2025.2 English - UG906

For 7 series and AMD UltraScale™ parts, use a method similar to the placer’s congestion estimation with the following metrics:

• Vertical routing congestion per CLB
• Horizontal routing congestion per CLB

Both metrics use a demand-based model to estimate routing requirements between two points. When demand exceeds 100, the tool uses routing in adjacent tiles. Congestion increases in areas of the die where demand consistently exceeds 100%.