CLKFBIN – Feedback Clock Input

UltraScale Architecture Clocking Resources User Guide (UG572)

Document ID
Release Date
1.10.2 English

CLKFBIN must be connected either directly to the CLKFBOUT for internal feedback, or to the CLKFBOUT through a BUF_IN. Using BUF_IN in the feedback path compensates for the clock network delay in the same XIPHY bank as shown in This Figure where the nodes 1 and 5 are phase aligned.