IP with avalon ST >-|-< SOPC builder

Yes, basically I had to create a SOPC Builder component/wrapper for the DSP function. This is just a tcl/ptf description file to map the DSP block's Avalon-ST signals to SOPC Builder. There is a bit of work involved to manually edit the tcl/ptf file if I make changes to the Avalon-ST interface (like change the number of channels for example), but usually this doesn't happen often.

I agree that Altera should've released a component wizard to handle this automatically, it's a pretty straightforward process.

Edit: just to be clear, I don't instantiate the DSP function outside SOPC, I've just created a folder for it and made it a SOPC Builder component using the method above.