Re: [casper] 32 Channel PFB and Wideband Real FFT . . .

2016-07-18 Thread G Jones
Hi Randy, I think the issue is that you are processing 16 samples per FPGA clock for VEGAS (if I remember right), so I expect you'll need to hand craft an FFT out of the FFT direct block and twiddle blocks. It might be easier to use a xilinx block in this case, but I haven't actually looked at what

[casper] 32 Channel PFB and Wideband Real FFT . . .

2016-07-18 Thread Randy McCullough
All, We're currently in the process of adding incoherent and coherent de-dispersion pulsar modes to our ROACH 2-based VEGAS backend and have hit a stumbling block. We've built all designs ranging from 8,192 channels down to 64 channels, but when attempting to implement a 32-channel design th