Intel® Quartus® Prime Standard Edition User Guide: Design Optimization

ID 683230
Date 11/12/2018
Document Table of Contents Fan-Out

Nodes with very high fan-out that use local routing tend to pull logic that they drive close to the source node. This can make other paths fail timing. Duplicating registers can help reduce the impact of high fan-out paths. Consider manually duplicating and preserving these registers. Using a MAX_FANOUT assignment may make arbitrary groups of fan-out nodes, whereas a designer can make more intelligent fan-out groups.