You needn't apologize ... sometimes I can be quite the blockhead.

Have you looked at the e8051? That was the "other" one to which that post referred. I gather it's even faster and more feature-rich.

By documentation I'm referring to is those PDF's. All they seem to do is to repeat the details provided on the web page.

You have to forget about using small, reasonably priced FPGA's, though, since this takes up half of an XS3S250E, and we don't know which half, i.e. which resources are left over for the justifying logic requirements. The result would be a nominally 75MHz 805x core plus some dedicated logic, and not really very much of it.

A lot depends on which and how much of the signal routing resources were used up by the core, as well as functions like the multipliers, DLL's, block RAM, distributed RAM, etc. They indicate how many "slices" they use, but not whether they use block RAM, distributed RAM, and how much, if so.

It would be really nice to have a full specification.

RE