Low Latency 40- and 100-Gbps Ethernet MAC and PHY MegaCore Function User Guide

ID 683628
Date 12/28/2017
Document Table of Contents

3.2.8. External TX MAC PLL

If you turn on Use external TX MAC PLL in the LL 40-100GbE parameter editor, the IP core has an extra input port, clk_txmac_in, which drives the TX MAC clock. You must connect this input port to a clock source, usually a PLL on the device.

The port is expected to receive the clock from the external TX MAC PLL and drives the internal clock clk_txmac. The required TX MAC clock frequency is 312.5 MHz for 40GbE variations, and 390.625 MHz for 100GbE variations. User logic must drive clk_txmac_in from a PLL whose input is the PHY reference clock, clk_ref.