L- and H-Tile Transceiver PHY User Guide

ID 683621
Date 1/30/2024
Document Table of Contents Lock-to-Data Mode

During normal operation, the CDR must be in LTD mode to recover the clock from the incoming serial data. In LTD mode, the PD in the CDR tracks the incoming serial data at the receiver input. Depending on the phase difference between the incoming data and the CDR output clock, the PD controls the CDR charge pump that tunes the VCO.

Note: The PFD is inactive in LTD mode. The rx_is_lockedtoref status signal goes high and low randomly, and is not significant in LTD mode.