[casper] DRAM (DDR3) ROACH-2

2013-07-24 Thread Juan-Pierre Jansen van Rensburg
Hi all I have been working on a yellow block for the DDR3 of the ROACH-2. As far as I know this yellow block does not yet exist? The same DRAM yellow block is used and interfacing the memory remains the same (as for the ROACH-1). The DRAM also uses an asynchronous fifo to allow long write

Re: [casper] DRAM (DDR3) ROACH-2

2013-07-24 Thread Wesley New
This is great work JP. Out of interest is anyone else planning to use the DDR3 on ROACH2? Wesley New South African SKA Project +2721 506 7365 www.ska.ac.za On Wed, Jul 24, 2013 at 8:24 AM, Juan-Pierre Jansen van Rensburg jvrensburg...@gmail.com wrote: Hi all I have been working on a

Re: [casper] DRAM (DDR3) ROACH-2

2013-07-24 Thread Matthew Bridges
Hi JP and Wes, I am very interested in this work, but from a RHINO perspective. I am looking into how I should go about adding the RHINOs DRAM into my Architecture. I have a few questions, if you have time to answer. Did you use the Memory Interface Generator? And did it work for you? Are there

Re: [casper] DRAM (DDR3) ROACH-2

2013-07-24 Thread Wesley New
Comments below. On Wed, Jul 24, 2013 at 12:07 PM, Matthew Bridges matthewbridge...@gmail.com wrote: Hi JP and Wes, I am very interested in this work, but from a RHINO perspective. I am looking into how I should go about adding the RHINOs DRAM into my Architecture. I have a few

Re: [casper] DRAM (DDR3) ROACH-2

2013-07-24 Thread Jonathan Weintroub
Hi JP, Wes, We need the DDR3 rather urgently (time scale of 1 to 2 months), and Rurik Primiani has recently been working on it. Laura Vertatschitsch will be joining our group in September and we had her in mind to help with this too though recently concluded her start date isn't soon enough.

Re: [casper] DRAM (DDR3) ROACH-2

2013-07-24 Thread Primiani, Rurik
Hi JP, We recently (last week) discovered we desperately need the DDR3 on ROACH2 since our work-around for getting the visibility data out of our system won't work in the long run (due to 10 GbE switch limiations... it's a long story). So just this week I re-started work on a DDR3 yellow block I

[casper] Resources not decreases significant

2013-07-24 Thread katherine viviana cortes urbina
Hi all, When the number of parallel spectrometers increases when one decreases the number of channels, but surprisingly, this increase is not very significant, why resources not decreases significant from 32 to 2048 channels and where do the resources, FFt, PFB? and like to know how many resource

Re: [casper] Resources not decreases significant

2013-07-24 Thread Jason Manley
Rurik's got a great memo about this: https://www.cfa.harvard.edu/twiki/pub/SMAwideband/MemoSeries/sma_wideband_utilization_1.pdf Jason On 24 Jul 2013, at 22:38 , katherine viviana cortes urbina wrote: Hi all, When the number of parallel spectrometers increases when one decreases the

Re: [casper] Resources not decreases significant

2013-07-24 Thread Andrew Martens
Hi Katty Hi all, When the number of parallel spectrometers increases when one decreases the number of channels, but surprisingly, this increase is not very significant, why resources not decreases significant from 32 to 2048 channels and where do the resources, FFt, PFB? and like to know