Mux Data Hold CDC - 2022.1 English

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

Document ID
UG906
Release Date
2022-05-04
Version
2022.1 English

In the Mux Data Hold CDC example, presented in the following figure, the multiplexer select signal is synchronized to the destination clock domain clk_b and the data_out is fed back to the multiplexer.

Figure 1. Mux Data Hold CDC Example

Similar to CE-controlled CDC, there is no restriction on how the multiplexer select signal is synchronized as long as it is reported as safe individually and the user is responsible for constraining the crossing delay on FF2_c.