Intel® Arria® 10 Transceiver PHY User Guide

ID 683617
Date 3/28/2022
Document Table of Contents

6.12.4. Enabling and Disabling Loopback Modes Using Direct Reconfiguration Flow

Arria® 10 devices have three loopback modes:

  • Serial Loopback
  • Reverse Serial Loopback (Pre-CDR)
  • Reverse Serial Loopback (Post-CDR)

The loopback mode can be dynamically reconfigured by accessing the register space.

Serial Loopback Mode

In serial loopback mode, a path exists between the serializer of the transmitter and the CDR of the receiver, so that the data from the CDR is recovered from the serializer while the data from the receiver serial input pin is ignored. You can enable or disable this mode.

Figure 275. Serial Loopback Mode

To enable serial loopback mode: