That example I put up is somewhat obsolete -- I put it up before SOPC Builder allowed the automation of such tasks. Now with SOPCB v4.2, there is a new "component editor" which allows you to build interfaces with multiple master/slave ports. Documentation on this is coming soon (a couple of weeks now, I think) to the Altera.com webshite.
Indeed, if you download the .zip I put up, extract only the verilog file, and take that into component editor, you'll be able to do the same thing that I did by writing the class.ptf file (that describes the avalon interfaces).
