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Mini cluster of synchronized Red Pitayas

Posted: Sun Oct 09, 2016 6:30 pm
by jeanminet
Hello,

Below is a picture of a cluster of 4 Red Pitayas synchronized via the SATA connectors.

On each Red Pitaya, one can select by software one of 3 clock sources:
- 125 MHz crystal
- 10 MHz clock on SATA IN
- 10 MHz clock on DOI1P

A 10 MHz clock is also output on the SATA OUT connector.
The 4 Red Pitaya are connected to each other using 4 SATA cables in a ring configuration.

The cluster clock is provided by a waveform generator on the DIO1P pin of the 3rd Red Pitaya (from top).
Each Red Pitaya outputs a 40 MHz sine signal from a DDS block that can be monitored on a scope trigged with the SYNC output of the function generator.

Image

The 4 sines have exactly the same frequency but their relative phase is somewhat random.
One could use the differential pair left on each SATA connector to transmit some trigger between the Red Pitayas.

Best,
Jean

Re: Mini cluster of synchronized Red Pitayas

Posted: Wed Oct 26, 2016 9:20 am
by pefu
Hello,

Is the FPGA code of your project publically available for reference?
That could be a helpful example for a project I'm currently working on.

Best regards, Peter.

Re: Mini cluster of synchronized Red Pitayas

Posted: Tue Nov 29, 2016 4:25 pm
by jeanminet
Hello Peter,

Sorry for the delay.
I've just published a blog post (and the source code) about this:
https://www.koheron.com/blog/2016/11/29 ... uster.html

Cheers,
Jean

Re: Mini cluster of synchronized Red Pitayas

Posted: Tue Nov 29, 2016 8:45 pm
by thickglass
Wow, cool project, keep it up :)

Re: Mini cluster of synchronized Red Pitayas

Posted: Mon Apr 03, 2017 3:43 pm
by shideh
could you do a more thorough tutorial? thanks so much