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    MXM to PCIe project

    Discussion in 'Sager and Clevo' started by 52571abc, Jul 18, 2019.

  1. 52571abc

    52571abc Notebook Consultant

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    52571abc, Jul 18, 2019
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  2. Meaker@Sager

    Meaker@Sager Company Representative

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    You'll need to consider the ECU signal.
     
    Meaker@Sager, Jul 18, 2019
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  3. 52571abc

    52571abc Notebook Consultant

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    what do you mean ??? did I made any design failua
    differential pair routing on pcie singla lanes
     
    52571abc, Jul 18, 2019
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  4. senso

    senso Notebook Deity

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    MXM cards talk to the EC, in Clevo case, if there isn't a temperature signal the laptop shuts down in 30 seconds flat.

    And there is no lenght matching in none of those differential pairs, and with connectors on both sides there is no ground plane for all those signals, consider changing to a single side connector with all signals on one side, or go for a 4 layer pcb with internal planes, they cost the same as 2 layer pcb's in jlpcb and other chinese board houses.
     
    senso, Jul 18, 2019
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  5. 52571abc

    52571abc Notebook Consultant

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    • Sorry, sir, I forgot to say that we fixed the problem of forced shutdown of the clevo device by arduino.(non graphic card or amd mxm on p751dm2)
    • but the design guide seems didn't defined length matching about different pcie lanes
     
    52571abc, Jul 18, 2019
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  6. 52571abc

    52571abc Notebook Consultant

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    52571abc, Jul 18, 2019
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  7. Meaker@Sager

    Meaker@Sager Company Representative

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    Just be careful running to spec when you are going to be using a breakout cable. Something you can check with a first prototype but if your design let's you follow better practise then why not?
     
    Meaker@Sager, Jul 18, 2019
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    Vasudev likes this.