TIMING-45: Unreasonable User Inter-Clock Uncertainty - 2023.1 English

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

Document ID
UG906
Release Date
2023-05-16
Version
2023.1 English

A user clock uncertainty of <delay> ns is defined between clocks <clock_name> and <clock_name> (see constraint position <position> in the Timing Constraint window in the Vivado IDE). High user clock uncertainty might adversely impact timing closure. Consider reviewing how much user clock uncertainty is required.