Intel® Cyclone® 10 GX Transceiver PHY User Guide

ID 683054
Date 4/14/2023
Document Table of Contents

5.1.8. Loopback

The PMA supports serial, diagnostic, and reverse loopback paths.

Figure 176. Serial Loopback PathThe serial loopback path sets the CDR to recover the data from serializer while data from receiver serial input pin is ignored by CDR. The transmitter buffer sends data normally.
Figure 177. Reverse Serial Loopback Path/Pre CDR
Figure 178. Reverse Serial Loopback Path/Post CDRThe reverse serial loopback path sets the transmitter buffer to transmit data fed directly from the CDR recovered data. Data from the serializer is ignored by the transmitter buffer.