Hi All, i have upload a very rough spacewire core on OC's cvs, you could check that if you have interest. SpaceWire is a high speed network for system usage. It has taken into consideration two existing standards, IEEE 1355-1995 and ANSI/TIA/EIA-644 by ESA. http://www.estec.esa.nl/tech/spacewire Now the router has a buffered switch matrix with column schedulers. The rtl written in verilog-2001 is now very rough. i need people to develop it together. if anyone has interest, please contact me: btltz at opencores,org Best Wishes, btltz from 068, Casic, China