LogiCORE Fast Fourier Transform (xFFT) v3.2 - Why is the first data frame after a multi-cycle reset incorrect?

AR#	24436	Search For Another Answer
Topic	IP-DSP Horizontal
Last Updated	09/21/2007
Status	Active

Description

Keywords: ISE, LogiCORE, FFT Compiler, FFT, Fast, Continuous, Burst, Loop, Loop Engine, Radix 4, Radix 2, valid, DV

Why is the first data frame after a multi-cycle reset incorrect?

Solution

This is a known problem, where the first frame of data is incorrectly marked as valid. To work around this issue, you can ignore the first frame after the reset.

This issue has been resolved in the xFFT v4.0, which was released in December 2006.

See (Xilinx Answer 29209) for a detailed list of LogiCORE Fast Fourier Transform (FFT) Release Notes and Known Issues.