Triple-Speed Ethernet Intel® FPGA IP User Guide

ID 683402
Date 10/04/2021
Public

A newer version of this document is available.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

Document Table of Contents

4.1.13.1. Gigabit Ethernet

You can connect gigabit Ethernet PHYs to the MAC function via GMII or RGMII. On the receive path, connect the 125-MHz clock provided by the PHY device to the MAC clock, rx_clk. On transmit, drive a 125-MHz clock to the PHY GMII or RGMII. Connect a 125-MHz clock source to the MAC transmit clock, tx_clk.

A technology specific clock driver is required to generate a clock centered with the GMII or RGMII data from the MAC. The clock driver can be a PLL, a delay line or a DDR flip-flop.

Figure 21. Gigabit PHY to MAC via GMII