and embedded version price is high! how could we manage this problem? Any suggestion would be appreciated! tnx
Statistics: Posted by voyager — Wed Sep 16, 2015 8:37 pm
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with the idea of making a 4 channel diversity receiver. Initially I tried a low en Xilinx FPGA board with FMC connector.
(The interposer board has to be modified to work with the Xilinx dev boards). While I had no problem getting data into the
dev board I ran out of resources.
With the arrival of the Parallella board I thought I would revisit this again. So at the moment I am in the process of deciding
the best way to connect the two. The PEC GPIO has enough differential IO on it to do the job. The board requires 2 lanes per
ADC channel a Data clock and a Frame clock plus some I2S.
Digikey stock the 80 pin TE Connectivity 2065769-1 used on the ADC board (they are very expensive at $20 each).
I think consuming all 4 channels will be a bit too much for a single Parallella board (8 GBits/s) so my current thinking
is to split the data and use 4 Parallella boards (eventually interlinked). I will however try to get it to work with
just one board before I waste more time and money on it.
I have not fully decided the topology of the system but I am leaning towards splitting the output of the ADC
on a custom board to 4 HDMI connectors, then another small custom board with HDMI and Samtec connectors.
Then using 4 HDMI cables to connect each of the Parallella boards. The cables will be the shortest ones I can
find to cut down on cable mismatching / losses. The Parallella boards would do some pre-processing
(DDC) then output that to a PC using 4 x 1 Gigabit Ethernet links where further processing would be done using
NVIDIA CUDA
This is a very long term project but I will follow this thread with interest. I am sure someone will come up with a
"I wish I had thought of that" idea. the system needs to be expandable so I can add more receivers (as cash allows).
Something like this looks interesting to do (click on overview)
- Charles
Statistics: Posted by G4GUO — Tue Nov 11, 2014 10:23 pm
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I have explored high speed connection of various ADCs to Parallella in my diploma thesis few months ago. It seems to be the best solution to use SATA or SAS cables and differential signaling. SATA connectors may be connected to Parallella via an adapter board similar to Porcupine, but optimized for differential signaling. The adapter board even allows mounting of Parallella board to the MLAB's http://wiki.mlab.cz/ base board.
Such design allows use different number of ADC channels (optimized for experiment) and even various ADC types. I have tested this idea on LTC2271 and LTC2190 ADCs with combination of ML605 FPGA development board (Parallella board was not available in time in which I was writing the thesis).
Statistics: Posted by kaklik — Tue Sep 09, 2014 7:02 pm
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