Thanks for the info, all. As you might expect, this was not an idle question. I have a need for this right now. The machine I need to build is:
3 GHz bandwidth (6 GS/s) 1024 channels in the spectrometer 1 polarization 50 millisecond or less accumulations. 1 ROACH board How should we proceed without duplicating effort already underway? How can we best help bring this to fruition? John > Yes, I think a parameter is a good idea. Maybe just a radio-box or a > drop-down-selection in the mask. Multiple cores will confuse users > (like everyone gets confused by the multiple FFT blocks) and will > probably become an admin nightmare down the road. > > Jason > > On 23 Apr 2010, at 07:40, Dan Werthimer wrote: > >> >> >> hi jason, >> >> perhaps we can have different yellow block cores, >> one hardened for people that need high speed input, >> one not hardened, >> >> or better yet - a parameter that selects whether the >> routing is hardened or not? >> >> dan >> >> >> >> On 4/22/2010 10:32 PM, Jason Manley wrote: >>>> suraj is planning on hardening the yellow block cores >>>> so that their routing/timing is locked down, independent >>>> of what else is running in the fpga. >>> >>> Please don't make this the default behaviour. On designs that are >>> nearly fully packed (99%), you need to be able to twiddle every >>> part of the design to make it fit, and sometimes that means re- >>> arranging the yellow blocks' innards. Part of the BEE2 DRAM >>> controller was hard-routed and it caused complications when the >>> chip got full. >>> >>> Jason >>> >>>> On 4/22/2010 2:57 PM, Mark Wagner wrote: >>>>> Hi John, >>>>> >>>>> I don't think anyone has been able to get a spectrometer working >>>>> at the full 3GS/s interleaved yet. The best Suraj and I have >>>>> been able to do is about 2.4Gs/s before we start running into >>>>> serious timing issues. We do have plans to meet soon with a >>>>> Xilinx timing expert in the hopes of resolving our issues. >>>>> >>>>> Mark >>>>> >>>>> >>>>> On Thu, Apr 22, 2010 at 2:12 PM, John Ford <[email protected]> wrote: >>>>> Hi all. >>>>> >>>>> Has anyone done a 6 GS/s spectrometer using 2 interleaved 3 GS/s >>>>> ADC >>>>> boards on a ROACH? I seem to recall someone doing something of >>>>> the sort, >>>>> but I don't recall any details. >>>>> >>>>> Thanks for any info! >>>>> >>>>> John >>>>> >>>>> >>>>> >>>>> >>>>> >>>> >>> >> > >
