Intel® Cyclone® 10 GX Transceiver PHY User Guide

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

2.6.1. Gigabit Ethernet (GbE) and GbE with IEEE 1588v2

Gigabit Ethernet (GbE) is a high-speed local area network technology that provides data transfer rates of about 1 Gbps. GbE builds on top of the ethernet protocol, but increases speed tenfold over Fast Ethernet. IEEE 802.3 defines GbE as an intermediate (or transition) layer that interfaces various physical media with the media access control (MAC) in a Gigabit Ethernet system. Gigabit Ethernet PHY shields the MAC layer from the specific nature of the underlying medium and is divided into three sub-layers shown in the following figure.

Figure 31. GbE PHY Connection to IEEE 802.3 MAC and RS

Figure 32. Transceiver Channel Datapath and Clocking at 1250 Mbps for GbE, GbE with IEEE 1588v2

Note: The Native PHY only supports basic PCS functions. The Native PHY does not support auto-negotiation state machine, collision-detect, and carrier-sense. If required, you must implement these functions in the FPGA fabric or external circuits.

GbE with IEEE 1588v2

GbE with IEEE 1588v2 provides a standard method to synchronize devices on a network. To improve performance, the protocol synchronizes slave clocks to a master clock so that events and time stamps are synchronized in all devices. The protocol enables heterogeneous systems that include clocks of various inherent precision, resolution, and stability to synchronize to a grandmaster clock.

The TX FIFO and RX FIFO are set to register_fifo mode for GbE with IEEE 1588v2.