
details
This is an easy guide to use W5500 for ATmega8 users. It provides W5500 drive and reference schematic and compares how to add ethernet connectivity with Microchip and W 5500.
Software: GitHub
Homepage : http://www.oltzen.de/w5500.html
Below is a circuit diagram that can be downloaded from the source link.

Excellent idea, I use the WIZ107SR using serial, but this will be the most ideal, if the TCP Stack is done well.