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 <[email protected]
<mailto:[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] <mailto:[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]>
<mailto:[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
