No output in simulation after connecting FIR and FFT using SOPC Builder

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I just had another idea... the FIR filter doesn't know anything about packets, as it works with bytes. Instead of generating the SOP and EOP signals yourself, which would require to work with the control signals between the two cores, you should use a avalon-st bytes to packets converter core (http://www.altera.com/literature/hb/nios2/qts_qii55012.pdf). Be sure you configure it with a packet size that the FFT will like.

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Thank you so much.

I am going to try it now