Hi Mark: Thanks for your help.
Wan -----Original Message----- From: Mark Wagner [mailto:[email protected]] Sent: Wednesday, 22 July 2009 8:11 AM To: Cheng, Wan (ATNF, Marsfield) Cc: [email protected] Subject: Re: [casper] bit width setting of pbf filter and fft widtband 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 [email protected] 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 >
