Mini cluster of synchronized Red Pitayas

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jeanminet
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Joined: Tue Aug 25, 2015 12:17 pm
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Mini cluster of synchronized Red Pitayas

Post by jeanminet » Sun Oct 09, 2016 6:30 pm

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

pefu
Posts: 3
Joined: Wed Sep 07, 2016 4:07 pm

Re: Mini cluster of synchronized Red Pitayas

Post by pefu » Wed Oct 26, 2016 9:20 am

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.

jeanminet
Posts: 33
Joined: Tue Aug 25, 2015 12:17 pm
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Re: Mini cluster of synchronized Red Pitayas

Post by jeanminet » Tue Nov 29, 2016 4:25 pm

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

thickglass
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Joined: Tue Nov 29, 2016 8:09 pm
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Re: Mini cluster of synchronized Red Pitayas

Post by thickglass » Tue Nov 29, 2016 8:45 pm

Wow, cool project, keep it up :)

shideh
Posts: 5
Joined: Tue Mar 28, 2017 12:11 am

Re: Mini cluster of synchronized Red Pitayas

Post by shideh » Mon Apr 03, 2017 3:43 pm

could you do a more thorough tutorial? thanks so much

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