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 <[email protected]> wrote: > 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. > > ~Jason Zheng > > On Mon, Jul 27, 2009 at 9:09 AM, Dan Werthimer <[email protected]>wrote: > >> >> 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 (course PFB, followed by fine FFT). for example >> see the 128 million point spectrometer block diagram at >> http://seti.berkeley.edu/jplsetispec/block_diagram.pdf >> >> >> best wishes, >> >> dan >> >> >> >> 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, Jul 27, 2009 at 8:31 AM, Laura Spitler >>> <[email protected]<mailto: >>> [email protected]>> wrote: >>> >>> 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 >>> >>> >>> >
