abyagowi

4 ms·

1.
by abyagowi 5y ago
please try to join our upcoming meeting about opening the FPGA code of the time card https://www.linkedin.com/feed/update/urn:li:activity:6909908...
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Open-sourcing a more precise time appliance(linkedin.com)
1 points by abyagowi 5y ago|2 comments
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by abyagowi 5y ago
Production version will come today or tomorrow. Check the github
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by abyagowi 5y ago
I sent send you a prototype if you are willing to help with some bug hunting
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by abyagowi 5y ago
Thats exactly the point for this project. Also, I am hoping once we release the FPGA HDL files, the community will start adding more features like IRIG-B output, etc...
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by abyagowi 5y ago
Yes, with the difference on how to present the time to the system, just a PHC
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by abyagowi 5y ago
That is not true. First of all, the reason why we used the Alinx module (which you can buy of ebay as well as Amazon), was to make it easier for the community to manufacture and build. Our internal version of the time card does not include
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by abyagowi 5y ago
Just give us a bit of time. We had to use some IPs that due to licensing limitations prohibited us to release the source and we were only allowed to release the bin files. We are replacing them to open source cores and we will have that par
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by abyagowi 5y ago
You are right. This sentence was not supposed to be a literal description of what is the best way to build the card. It was more referring to the fact the building this card is not that hard since the main goal for this project was to liber
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by abyagowi 5y ago
I have been working on a version with two GNSS receivers L1/L2 and L1/L5. The SA53 receives two PPS inputs and that allows you to detect Spoofing and Jamming. Again, I like to emphasize, this is not a done work. We shared whateve
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by abyagowi 5y ago
Of course we go inspired by the Google Spanner project and what they have published over a decade ago. Hats off to the Google Spanner team
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by abyagowi 5y ago
Of course we are not going to build the card in the lab with assembling SMD parts. This was more a way to explain that building such a card should not be out of access for anyone
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by abyagowi 5y ago
Most (if not all) our switches in the datacenter are capable to perform as transparent clocks. With transparent clocks you can keep the time sync error down to less than 5ns per hop
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by abyagowi 5y ago
Again, invented might be too strong. This is an abstraction of what you need minimally to build a time server on an open source basis. We appreciate and are humble to other products in the market
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by abyagowi 5y ago
Please excuse the language “invented”. We simply meant “came up with a form factor” of having the MAC+GNSS present via PCIe bus as a POSIX clock similar to a NIC with hardware timestamping. We are humble to all the awesome products that are
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by abyagowi 5y ago
I am very thankful to all of you putting all these questions and answers. We have a bi-weekly meeting under the open compute project and you can find previous talks there too. www.ocptap.com
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by abyagowi 5y ago
That’s a good question. GNSS gives you a 1 pulse per second signal. It is often with 20ns of accuracy. Now you need to interpolate nanoseconds between consecutive 1pps pulses. This is where a high stability oscillator is needed. You can cer