Clock Fall Input Delay Command Option - 2023.2 English

Vivado Design Suite User Guide: Using Constraints (UG903)

Document ID
Release Date
2023.2 English

The -clock_fall option specifies that the input delay constraint applies to timing paths launched by the falling clock edge of the relative clock. Without this option, the Vivado IDE assumes only the rising edge of the relative clock.

Do not confuse the -clock_fall option with the -rise and -fall options. These options refer to the data edge and not to the clock edge.