connection problem of sopc builder

Hi all,

I use the "Simple Socket Plus" example on my 3c120 board and made the ethernet work, but there comes a problem that how can I connect my user define block to the ethernet?

I have some design blocks like FFT and they already have an Avalon-ST interface and can be conncected to other blocks in bdf files. But I see a huge block when i try to add the sopc builder file in a bdf file, is that the thing I should use?

Thanks in advance!

Jiaqi Yuan