the Altera FFT IP function well?

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PCI Express*, Networking and Connectivity, Memory Interfaces, DSP IP, and Video IP

the Altera FFT IP function well?

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The following is IP Config

https://www.alteraforum.com/forum/attachment.php?attachmentid=7157 https://www.alteraforum.com/forum/attachment.php?attachmentid=7158 https://www.alteraforum.com/forum/attachment.php?attachmentid=7159

When I force the DC to the sink_real,and sink_imag to 0 ;The FFT IP work as following;who can tell me why and how to solve.

https://www.alteraforum.com/forum/attachment.php?attachmentid=7156

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