L- and H-Tile Transceiver PHY User Guide

ID 683621
Date 10/05/2023
Public
Document Table of Contents
Give Feedback

4.1. When Is Reset Required?

You can reset the transmitter (TX) and receiver (RX) data paths independently or together. The recommended reset sequence requires reset and initialization of the PLL driving the TX or RX channels, as well as the TX and RX datapaths. A reset is required after any of the following events:

Table 141.  Reset Conditions
Event Reset Requirement
Device power up and configuration Requires reset to the transceiver PHY.
PLL reconfiguration Requires reset to the PHY. The transmitter channel must be held in reset before performing PLL reconfiguration.
PLL reference clock frequency change Requires reset to the PHY.
PLL recalibration The transmitter channel must be held in reset before performing PLL recalibration.
PLL lock loss or recovery Requires reset to the PHY.
Channel dynamic reconfiguration Requires holding the channel in reset before performing a dynamic reconfiguration that causes rate change.
Optical module connection Requires reset of RX to ensure lock of incoming data.
RX CDR lock mode change Requires reset of the RX channel any time the RX clock and data recovery (CDR) block switches from lock-to-reference to lock-to-data RX channel.