18.104.22.168. Lock-to-Reference Mode
In LTR mode, the phase frequency detector (PFD) in the CDR tracks the receiver input reference clock. The PFD controls the charge pump that tunes the VCO in the CDR. The rx_is_lockedtoref status signal is asserted active high to indicate that the CDR has locked to the phase and frequency of the receiver input reference clock.
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