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Prototype mainboards coming soon

Discussion in 'Pyra News' started by EvilDragon, Dec 4, 2016.

  1. neko

    neko I haz 300 posts

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    Wow. I ordered some stuff yesterday, but I wasn't expecting to receive it before Christmas. I figured the Christmas rush would have been finished by now.
     
  2. mecksg1

    mecksg1 Very Active Member

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    Well take the holiday and have a fun time with your family. You deserve it big time
     
  3. mclien

    mclien Very Active Member

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    I'll let you know if/when I get contact with him. Have we in theory a way to get hardware to Hamburg? (I may have someone who might help out with equipment).
    anyone here, who has planned to be at 33c3? (I skipped this year, so have no ticket).
     
  4. juliano

    juliano Member

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    First of all sorry for being away for some time. Looking at this HW issue this seems to me a Power Integrity issue probably due to SSN (simultaneous switching noise), where the digital signals are causing excessive crosstalk on the PDN (Power Delivery Network) generating noise on the PDN (VDD/VCC and GND) that leads to a reset.Using more vias and decoupling capacitors are certainly the way to go. As more vias are added to the design it decreases the GND impedance and makes it easier for the high frequency current to return. I just made a simple simulation showing how the noise generated by a 2GHz clock on a nearby PCB trace is decreased as we add more vias connecting the GND net at different layers:

    The target impedance is decreaseng over the decades as we can see here:

    But this is a fixed value, in reality we have a mask that defines the target impedance for a component (here the OMAP) as a function of frequency, since the layout of the PDN and the capacitors are all working together and are responsible for these resonances. Here ais an example of impedance mask:

    Finally, I have some slides that shows how the capacitors changes the PDN Impedance, the noise on the VDD and also radiated emissions.

    This is a common issue today and I will be more than happy to evaluate the designs before sent to prototyping (if it's not too late already).
     
    Drezrek, szr, jorlinn and 27 others like this.
  5. mclien

    mclien Very Active Member

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    Generally bunnie is willing to help. He is at 33c3, but says that he would not be much of a help, without having deeper knowledge about the actual hardware design.
    So question is: is there some sense to meet up with him at 33c3 (and if who of the involved guys here is the most fitting person to do so? Nikoaus, ED, some other hardware guy)?
    I for sure are the wrong guy for that topic.
    I'll keep you informed about my other question, if he is wiling to spend more time "digging" into it (he has to put reasonable amount of time into it, to be of help I guess).
     
    rSl, 2coop4 and ClockworkCoder like this.
  6. Grench

    Grench Forum Addict!

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    If only I had anything to share. It has been a long wait, but I'm still looking forward to it.
     
    rSl, rygD and ClockworkCoder like this.
  7. error

    error Active Member

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    Wow. I knew there was a lot I didn't know about electronics but I never realized how much I didn't know until I saw these diagrams.
    I'm glad people much smarter than me are working on this.
     
    ClockworkCoder likes this.
  8. matzesu

    matzesu Advanced Member

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    Well, I'm a real noob in Linux, but I have Experience from the Pandora, so I think i could also deal whit the Pyra even at this early stage..

    Dotnt expect videos from me, as I ditnt know how to make Videos or how to cut them for YouTube..
    but I will post a lot of pictures, and lots of text where I write about my experience so far..

    What's are the diverences between a Mass Production Unit and the Prototype which is going to sell??
    Will it have a proper Heatsink??
    The lastest Case Revision whit the Better Hinge area??
    And the Coating for the speakers??
    And if the 1,3 ghz Unit is fixed whit the next CPU Board, are they being shipped whit 1,5 ghz ??

    As long the Prototype is better than my Pandora, I would be happy I ditnt need a ├╝ber perfect Case, as long it's works and is tough for everyday carry
     
    Last edited: Dec 22, 2016
    rygD likes this.
  9. EvilDragon

    EvilDragon Administrator Staff Member

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    Thank you so much! It's not too late, we planned to work on possible improvements of the CPU boards until early of January and then order them.
    Nikolaus will prepare the needed files for you. :D
     
    FBnil, kev_os, Kippykip and 17 others like this.
  10. Xcl4m4t10n

    Xcl4m4t10n Very Active Member

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  11. mecksg1

    mecksg1 Very Active Member

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    any new updates on parts coming yet and also the auction for more prototype pyra's. ( inot trying to be that guy but was just wondering?=)
     
    directive0 likes this.
  12. directive0

    directive0 Very Active Member

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    Thank you for being that guy. I want moar newz!
     
  13. Bosbeetle

    Bosbeetle Terminally lost

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    Wow I love this community.... But I also feel sad I have nothing vital to contribute.
     
    FlapJack and Kippykip like this.
  14. Christoph.Krn

    Christoph.Krn Very Active Member

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    If you do want to do that, you could provide bug reports or write documentation, which are both really useful things!
     
  15. Bosbeetle

    Bosbeetle Terminally lost

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    Good options if I could write decent english. But maybe sometimes Ill find my niche :)
     
  16. matzesu

    matzesu Advanced Member

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    You can write better English than I do :)

    I will make a comparison shot of Switch and Pyra :)
     
    ClockworkCoder and rSl like this.

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