Can cyclone V soc HPS Gigabit Ethernet mac interface with 10/100 phy

Hi,

The Cyclone V SoC HPS EMAC does not support RMII PHY, you may refer below documentation:

https://www.intel.cn/content/www/cn/zh/programmable/documentation/doq1481305867183.html#ndt1481304449025

You may also refer to below discussion on this issue:

https://community.intel.com/t5/Programmable-Devices/Using-PHY-with-RMII-interface-on-Cyclone-V-SoC/m-p/687632