L- and H-Tile Transceiver PHY User Guide

ID 683621
Date 1/30/2024
Document Table of Contents Programmable Differential On-Chip Termination (OCT)

Receiver buffers include programmable on-chip differential termination of 85Ω, 100Ω, or OFF.

You can disable OCT and use external termination. If you select external termination, the receiver common mode is tri-stated. Common mode is based on the external termination connection. You must also implement off-chip biasing circuitry to establish the VCM at the receiver buffer.

Receiver termination is enabled by default even before the device is configured. This is to help mitigate hot swap.