Hi If you could find a book, Ben Cohen's "Component Design by Example" in your lab near by, just give a glance to see if you like it. It does not treat UART16550 itself. But it handles UART with VHDL. good luck ---- Yoshiaki Naruse ---- -- To unsubscribe from cores mailing list please visit http://www.opencores.org/mailinglists.shtml