This section reports nets that meet both of the following conditions:
- The net has a fanout greater than 10,000.
- The net is not driven by a flip-flop.
High fanout nets require a driver profile that supports replication without affecting pre-path timing. Replication enables the tool to place duplicate drivers near the loads, improving overall routing efficiency. However, if source constraints exist, the tool might cluster the replicated drivers together, which limits placement flexibility and reduces the effectiveness of replication.
The details section of the report includes the following:
- Load types
- Driver profile information
- Net name
Timing information is not included. If the net drives a false path or a path with a very low timing requirement, you can ignore the entry.
Figure 1. Non-FD High Fanout Nets Example
