FFT Output is missing one sample when sink valid is not continuously asserted

Hi, I would like to apologize for the delay in response. It seems like I encounter some issues with notification reaching my mailbox. Sorry for the inconvenience. As I understand it, you are observing some issues related to the FFT IP missing sample when sink valid is not continuously high. For your information, this seems to be a known issue and you may refer to the KDB as following: https://www.intel.com/content/www/us/en/programmable/support/support-resources/knowledge-base/ip/2019/why-is-the-last-output-frame-of-the-intel--fft-ip-core-missing-e.html?wapkw=why+is+the+last+output+frame+of+the+intel+fft+ip+core+missing As a workaround, you may configure the Output Order in FFT IP to be Digit Reverse to see if works for you. Alternatively, you may need to hold the sink_valid high continously. Sorry for the inconvenience. Please let me know if there is any concern. Thank you. Best regards, Chee Pin