There are also both USB2 and Ethernet MAC cores. I've been weighing the advantages/disadvantages of both and am still unsure which is better for a radio, though I'm leaning towards Ethernet lately.
Greg (WD9DEX) mentions using Opencores USB 1.1, does anyone else have any experience with the various cores there?
Later, Artie Lekstutis KC2MFS
The microprocessor cores are particularly interesting on opencores.org