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AR# 20713

LogiCORE xFFT v3.1 Patch - The Virtex-4 Radix-4 Burst I/O with unscaled arithmetic FFT does not generate

Description


General Description: 
The Virtex-4 Radix-4 Burst I/O with unscaled arithmetic FFT does not generate. 
 
This bug occurs for Radix-4 Burst I/O and Radix-2 Minimum Resources when the output width equals 35 and the phase factor width is greater than 18. As a result, the following do not generate: 
 
1K-pt 24 bit data with 20 or 24 bit phase factors 
16K-pt 20 bit data with 20 or 24 bit phase factors 
 
For the Pipelined Streaming I/O, the core does not generate if the output width is 36 or greater and the phase factor width is greater than 18. As a result, the following do not generate: 
 
Point size of 2K, 4K, 8K, 16K, 32K, 64K with 24 bit input and 20 or 24 bit phase factors 
Point size of 32K, 64K with 20 bit input and 20 or 24 bit phase factors

Solution


This problem has been fixed in the xFFT v3.1 patch. 
 
See (Xilinx Answer 20709).
AR# 20713
Date Created 09/03/2007
Last Updated 05/19/2014
Status Archive
Type General Article