> >> It tends to have an annoyingly complex interface if all you needed was > >> 10Mbps. I haven't quite figured out if the layout issues get easier at= lower > >> speeds. :-( > >=20 > > It is a standard RMII interface. >=20 > Yeah; a 50MHz (or 25MHz for MII) multi-signal bus, with appropriate PCB "= layout > guidelines" and issues. Not a piece of cake! >=20 > BillW If you use the PIC32 with built in Ethernet controller you will need to use= a=20 PHY with MII or RMII interface. Here is my board with a LAN8720. Partial schematic: CAD-topside: CAD-bottomside: Picture topside: Picture bottomside: I am not particular pleased with all the topside traces between the LAN8720= and=20 the PIC and it could probably be done to take much less space from the=20 groundplane if thinner traces and smaller vias where used but I valued thic= ker=20 traces, larger vias and larger clearances here since I was going to etch th= e=20 bord myself. A couple of these boards have been working very well for quite some time no= w=20 but I have not done any EMC testing on it. /Ruben --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .