Transceiver CDR Question

- I plan to connect the slow clock provided along with the data to the "refclk" input of the CDR. Does the CDR PLL automatically readjust its serial clock output (serial clock = 10x of slow clock) when the slow clock input frequency changes? I am wondering if I need a XCVR reconfiguration controller to manipulate the CDR for this situation?

- When is XCVR reconfiguration actually needed?

Hi,

Whenever the refclk changes, you should perform dynamic reconfiguration to the CDR so that the internal counters can be updated to work with the new data rate. If not, you might get incorrect data recovered from the CDR. The XCVR reconfiguration controller is required to performed dynamic reconfiguration.