Cyclone® V Hard Processor System Technical Reference Manual

ID 683126
Date 8/28/2023
Public
Document Table of Contents

18.3. EMAC Signal Description

The EMAC provides a variety of PHY interfaces and control options through the HPS and the FPGA I/Os.
For designs in which the HPS is pin-limited, the EMAC signals can be routed through the FPGA as any one of the following interfaces by using soft adaptor logic in the FPGA:
  • RMII/RGMII
  • MII/GMII
  • SGMII

The figure below depicts a design which routes the EMAC0 and EMAC1 signals through the FPGA to provide an RMII and SGMII interface.

Refer to the "EMAC FPGA Interface Initialization" section to find out more information about configuring EMAC interfaces through FPGA.

Figure 72. EMAC to FPGA Routing Example
Note: The Micrel KSZ9021RN Ethernet PHY has been verified to work properly with the HPS EMAC and is recommended for use in board design.