Re: [casper] large green FFTs

I should have provided some background for my question. I have a basic spectrometer model for an iBOB that uses 10.1. It works perfectly for FFT sizes up to 2k. Over the weekend I tried 4k and 8k, and both resulted in incorrect spectra. Timing was fine. So has anyone used 10.1 to compile a model wi

Re: [casper] large green FFTs

> I suggest you try the 10.1. I no longer use the 7.1 libraries and > they're not under active development like the 10.1 libraries. There > have been numerous fixes to the 10.1 FFT to fix these and other > problems. There are still timing problems with 10.1, but the FFT is > working AFAIK. Yeah, w

Re: [casper] large green FFTs

I suggest you try the 10.1. I no longer use the 7.1 libraries and they're not under active development like the 10.1 libraries. There have been numerous fixes to the 10.1 FFT to fix these and other problems. There are still timing problems with 10.1, but the FFT is working AFAIK. My compi

Re: [casper] large green FFTs

> I compiled an 8192 channel FFT the other day no problems. But I have > not yet tried it on actual hardware. We had trouble building large ones that meet timing. Randy modified the library to fix the problem. I'm thinking these were 4096 channel (8192 point) real 200 MHz IP rate builds. It wor

Re: [casper] large green FFTs

Btw, thanks for the pointer, was the 128M point spectrometer realized using Casper library? yes, details of this spectromter are at: http://casper.berkeley.edu/wiki/SETI_Spectrometer best, dan ~Jason On Mon, Jul 27, 2009 at 9:13 AM, Jason Zheng > wrote: Da

Re: [casper] large green FFTs

Dan, Btw, thanks for the pointer, was the 128M point spectrometer realized using Casper library? ~Jason On Mon, Jul 27, 2009 at 9:13 AM, Jason Zheng wrote: > Dan, > > I fully understand the memory limitations. Just to clarify, it was just a > experiment on the capabilities of the Casper FFT li

Re: [casper] large green FFTs

Dan, I fully understand the memory limitations. Just to clarify, it was just a experiment on the capabilities of the Casper FFT library, not intended to actually implement on FPGA. What prompted me to do this experiment was a rumor that the Casper library could support multi-million point FFTs. ~

Re: [casper] large green FFTs

hi jason zheng, as you probably know, a 2^20 point FFT won't fit on an fpga, as it requires 2^19 times 36 bits of memory. the largest single fft that we've ever used on an FPGA is 2^15 points. to implement higher resolution spectrum analyzers one needs to implement analysis in two stages (cour

Re: [casper] large green FFTs

I compiled an 8192 channel FFT the other day no problems. But I have not yet tried it on actual hardware. Jason On 27 Jul 2009, at 08:41, Jason Zheng wrote: Last time I tried this on 10.1 with a 2^20 FFT design, the Matlab froze for a long time and I ended up closing the program. On Mon,

Re: [casper] large green FFTs

Last time I tried this on 10.1 with a 2^20 FFT design, the Matlab froze for a long time and I ended up closing the program. On Mon, Jul 27, 2009 at 8:31 AM, Laura Spitler wrote: > Hello everyone, > > What's the status of large green FFTs, where "large" is greater than > 2^11? Can they now be reli

[casper] large green FFTs

Hello everyone, What's the status of large green FFTs, where "large" is greater than 2^11? Can they now be reliably synthesized in 10.1? Thanks, Laura

Re: [casper] ROACH power consumption

In answer to John's question: The design estimates for ROACH (which were worst case from the point of view of the FPGA) are as follows: Voltage Total currents Rail Power 12 3.3640.36 5 6.7833.91 3.3