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

ID 741328
Date 2/09/2023

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Document Table of Contents 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.