Hi louis, I've just checked the spec sheet - 64 multipliers!! I'm guessing you ran out of slices when you (or maybe the compiler) pushed lots of multipliers into logic? (the lx has more slices than the sx) Maybe send around your utilisation summary tomorrow - it sounds like you might need to find some pretty substantial savings from somewhere.
A few things which might help save logic: - hard code the fft shift schedule - lower the number of fft bits, or use bit growth - if the fft uses pipelined convert cores for rounding, using a cheap rounding strategy with low latency should help. - combine fir filters in a single block which shares logic (if you haven't already), same with the fft. But you might be better off finding a different roach :) Jack On 28 Oct 2014 00:37, "Louis Dartez" <louisdar...@gmail.com> wrote: > Hi Dan, > Slices is what seems to be problem from the error report (which I can send > around tomorrow morning when I’m back in the lab). I seem to remember that > that the compiler raised an error stating that I was trying to ~80k slices > when only ~60k are available. I knew this would be a slippery slope when I > started. But it would be great if we could salvage our LX110T. > > Any chance someone out there has a ROACHI SX95T that’s just collecting > dust? > L > > Louis P. Dartez > > Graduate Research Assistant > > STARGATE > > Center for Advanced Radio Astronomy > > University of Texas Rio Grande Valley > > (956) 372-5812 > > > On Oct 27, 2014, at 7:31 PM, Dan Werthimer <d...@ssl.berkeley.edu> wrote: > > hi louis, > > are you running out of memory? dsp48's? slices? > > if memory, the easiest thing to do is cut back on > number of frequency channels. > > best, > > dan > > > On Mon, Oct 27, 2014 at 4:59 PM, Louis Dartez <louisdar...@gmail.com> > wrote: > > Hi all, > > I have implemented a 4 channel 200MHz correlating spectrometer on a ROACH 1 > using the Virtex5 SX95T. Currently, I am trying to get this same design to > compile and run on a LX110T chip instead. I know that the SX95T is much > more > DSP intensive and more suitable for this sort of thing. During compilation > for the LX110T I ran into the expected issues with resources and trying to > use more than were available on the LX110T. I was wondering if anyone had > any tips/advice on how to go about this? Has anyone out there run into > similar situations? What knobs should I be able to tweak to get the design > to compile for a LX110T? Is it even possible? > > I’d be more than happy to share my mdl (slx) files if needed. :) > > Thanks in advance! > L > > Louis P. Dartez > > Graduate Research Assistant > > STARGATE > > Center for Advanced Radio Astronomy > > University of Texas at Brownsville > > (956) 372-5812 > > > >
