CAN bus controller with avalon interface

Please ask your question only once.

There seems to be a CAN core available here (http://www.altera.com/products/ip/iup/can/m-ifi-can20b.html?gsa_pos=1&wt.oss_r=1&wt.oss=can).

If you prefer a free version, it is easy to modify the wishbone controller from the Opencores website to an Avalon interface. They are very similar.