Problem with using Inverse FFT Megacore

[Altera_Forum]

I have a megacore FFT (length=32768, Buffered Burst) on the fpga and sending it data from the ARM processor (Cyclone V SoC) 

I can successfully perform FFT on data.  But when I use the same core to perform Inverse FFT, it fails. I check output of the FFT core when inverse=1 and inverse=0. Both are the same.  I assert & deassert 'inverse' according to the documentation. That is, there is a pulse for inverse input exactly when there is a pulse at sink_sop. But for the rest of the time it is a '0' There are no source_errors.  I do not understand why the FFTcore output is same regardless of the input pulse at inverse. Is there else that I am supposed to do for the Inverse function?  Thanks, Surabhi

[Altera_Forum]

--- Quote Start ---   I assert & deassert 'inverse' according to the documentation. That is, there is a pulse for inverse input exactly when there is a pulse at sink_sop. But for the rest of the time it is a '0' Surabhi  --- Quote End ---   are you sure about this? I thought inverse input should one value throught its frame

[Altera_Forum]

Hi Kaz. Thanks for that. Keeping the inverse at '1' throughout the frame helped. Now it does calculate the Inverse. 

I just always thought it was a pulse because in the guide it said " Inverse FFT calculated if asserted. Only sampled at SOP" So I figured it checks for inverse input only at the sop. I guess that was a bad assumption to make. Thanks for the help.