Re: [casper] bit width setting of pbf filter and fft widtband

[Mark Wagner]

Hi Wan,

Jason says that he has been able to use 25 bitwidth in the past without 
issues, but there's been some changes to the FFT recently and i've had 
some troubles as well with other bitwidths.  I recommend using only 18 
bits right now.  If I find a fix, i'll let you know.

Thanks,
Mark

wan.ch...@csiro.au wrote:
Hi:
 
Is there any instructions to set the bit width of PFB and FFT?
 
When I set output bitwidth of PBF to 25, I get a wrong spectrum 
output. But it works well when the bitwidth is set to 18.
 
I guess something might be over flow in the FFT block.
 
Any idea on the bitwidth of PFB and FFT?
 
Thanks
 
Wan