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AR# 29858

LogiCORE Fast Fourier Transform (FFT) v5.0 - Why is the "Number of Stages using Block RAM" option on page 3 of the GUI grayed out, when the Implementation Option on page 1 is set to Automatic?

Description

Why is the "Number of Stages using Block RAM" option on page 3 of the GUI grayed out, when the Implementation Option on page 1 is set to Automatic? 

 

If you attempt to implement a fully pipelined FFT, this will result in the following error: 

ERROR:sim - Number of Stages : 0 is invalid.

Solution

This is due to a know issue with the Fast Fourier Transform (FFT) v5.0, that only affects the Auto Implementation option when the resulting Implementation Option is Pipelined, Streaming I/O. This will be fixed in the next release of the FFT. 

 

To work around this issue, use the Pipelined, Streaming I/O Implementation Option, instead of the Auto option. 

 

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

AR# 29858
Date Created 11/27/2007
Last Updated 05/20/2014
Status Archive
Type General Article