Synchronous Clocks - 2023.2 English

Vivado Design Suite User Guide: Using Constraints (UG903)

Document ID
Release Date
2023.2 English

Two clocks are synchronous when their relative phase is predictable. This is usually the case when their tree originates from the same root in the netlist, and when they have a common period.

For example, a generated clock and its master clock that have a period ratio of 2 are synchronous because they propagate through the same netlist resources up to the generated clock source point and have a common period of 2 cycles. They can be safely timed together.