Arria® 10 Transceiver PHY User Guide

ID 683617
Date 4/01/2024
Public
Document Table of Contents

2.6.1.1. 8B/10B Encoding for GbE, GbE with IEEE 1588v2

The 8B/10B encoder clocks 8-bit data and 1-bit control identifiers from the transmitter phase compensation FIFO and generates 10-bit encoded data. The 10-bit encoded data is sent to the PMA.

The IEEE 802.3 specification requires GbE to transmit Idle ordered sets (/I/) continuously and repetitively whenever the gigabit media-independent interface (GMII) is Idle. This transmission ensures that the receiver maintains bit and word synchronization whenever there is no active data to be transmitted.

For the GbE protocol, the transmitter replaces any /Dx.y/ following a /K28.5/ comma with either a /D5.6/ (/I1/ ordered set) or a /