F-Tile Triple-Speed Ethernet Intel® FPGA IP User Guide

ID 741328
Date 4/03/2023
Public

A newer version of this document is available. Customers should click here to go to the newest version.

Document Table of Contents

5.2.3.1. Comma Detection

The comma detection function searches for the 10-bit encoded comma character, K28.1/K28.5/K28.7, in consecutive samples received from PMA devices. When the K28.1/K28.5/K28.7 comma code group is detected, the PCS function realigns the data stream on a valid 10-bit character boundary. A standard 8b/10b decoder can subsequently decodes the aligned stream.

The comma detection function restarts the search for a valid comma character if the receive synchronization state machine loses the link synchronization.