SPRUIV7B May 2022 – September 2023 AM620-Q1 , AM623 , AM625 , AM625-Q1 , AM625SIP
As shown in Figure 6-41 the reference clock (FREF) input is used to generate the synthesized clock, but can also be used as the bypass clock for some outputs of the PLL whenever the PLL enters bypass mode. It is mandatory for the PLL clock synthesis.