Jean MASSON (Mr.):
Ya, you right. I been inplementing 8051 ALU architecture (or if can, might be the whole archtecture as well) into Altera FLEX10K by using VHDL code. :-)
Regarding for the Mayer's VHDL 8051 implementation, is it a reference book or URL? Can you give more detail on it like the URL address/the name of the book? 10 Q for your help! :-)

Best Regard,
Alex