Re: [casper] ROACH1 QDR size

2013-03-02 Thread Gerry Harp
Hi Ryan Can you say a few words about how the in-place corner turner works? I'd be fascinated to hear. Thanks Gerry On 3/1/2013 11:28 AM, David MacMahon wrote: Thanks, Ryan, The problem was actually in the integration buffers. We were using QDR vector accumulators and the vector was too

Re: [casper] ROACH1 QDR size

2013-03-02 Thread Dan Werthimer
hi gerry, you might be interested in aaron's paper about in place corner turners: https://casper.berkeley.edu/wiki/Papers Parsons, A., The Symmetric Group in Data Permutation, with Applications to a High-Bandwidth Streaming FFT

[casper] ROACH1 QDR size

2013-03-01 Thread Jack Hickish
Hi All, Is someone able to confirm that the size of the QDR chips on ROACH 1 boards depends solely on the board version? If this is indeed the case, does anyone know the QDR specs for the different board iterations? Cheers, Jack

Re: [casper] ROACH1 QDR size

2013-03-01 Thread David MacMahon
Hi, Jack, We noticed that one of our designs gave bogus results when run on a ROACH 1 board with a serial number in the range 02, but valid results when run on a ROACH 1 board with a serial number in the ranges 03 or 04. After much head scratching, we opened up one 02, one

Re: [casper] ROACH1 QDR size

2013-03-01 Thread Ryan Monroe
Hey David, I know it's probably too late, but I figured out how to do a QDR-corner turn without ping-ponging (thus, doubling the effective size of the QDR). Give me a shout if you need this in the future! On 03/01/2013 10:23 AM, David MacMahon wrote: Hi, Jack, We noticed that one of our

Re: [casper] ROACH1 QDR size

2013-03-01 Thread Dan Werthimer
hi ryan, can you check this into one of the GIT repositories? thanks, dan On Fri, Mar 1, 2013 at 10:37 AM, Ryan Monroe ryan.m.mon...@gmail.comwrote: Hey David, I know it's probably too late, but I figured out how to do a QDR-corner turn without ping-ponging (thus, doubling the effective

Re: [casper] ROACH1 QDR size

2013-03-01 Thread Ryan Monroe
It's not that complete. I could write a memo about it and throw around some matlab code. I implemented it for a demo several months ago but it was never tidy. Whoever actually needs it would have half of their work done though. Basically, you just have to permute the bits of the address

Re: [casper] ROACH1 QDR size

2013-03-01 Thread Jack Hickish
Hi David, That was exactly the information i was looking for -- thanks! Jack On 1 March 2013 18:23, David MacMahon dav...@astro.berkeley.edu wrote: Hi, Jack, We noticed that one of our designs gave bogus results when run on a ROACH 1 board with a serial number in the range 02, but