synthesizable minimal gigabit ethernet with RGMII interface
The ethernet communication is explored in following blog posts
overview and MDIO : https://hardwaredescriptions.com/gigabit-ethernet-vol1-mdio-and-communications-wonderland/
RGMII : https://hardwaredescriptions.com/ethernet-vol2-a-look-to-the-rgmii-connection/
ethernet, ip and udp frame header parsing : https://hardwaredescriptions.com/gigabit-ethernet-vol-3-processing-protocols-from-reasonably-accessible-memory/
rgmii transmitter : https://hardwaredescriptions.com/ethernet-vol-4-txing/