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LisaXu's avatar
LisaXu
Icon for New Contributor rankNew Contributor
2 years ago
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Idaville LCC I2C layout trace length

Dear Intel Team: we checked the document <Idaville LCC Platform Design Guide (PDG)>, it shows I2C/SMBUS PCB trace length should be kept in below 30 inch. In my opinion, we ususally use ~3pF/inch f...
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  • AqidAyman_Altera's avatar
    AqidAyman_Altera
    2 years ago

    Hi Lisa,


    I have got input from the internal team as below:


    All these recommendations in the tables in section 13.1.2 were put together using simulations by our Signal Integrity Team.


    I checked for example the guidelines provided in the Whitley PDG (doc# 574174). Whitley is the platform for ICX-SP, which has a different PCH than ICX-D. Checking table 6-36 in the Whitley PDG I see similar number to the table 13-1 in the Idaville PDG. It seems that even with a different PCH they arrived at similar conclusions.


    You also can run your own simulations and if you think the board is able to handle longer traces, they can do it, but Intel can’t offer support if they deviate from our recommendations.


    Regards,

    Aqid


AqidAyman_Altera's avatar
AqidAyman_Altera
Icon for Regular Contributor rankRegular Contributor
2 years ago

Hi Lisa,


Okay noted on this. Thank you for the confirmation. I will update you back once I got any input from the internal team who owned the documentation.


Regards,

Aqid


  • LisaXu's avatar
    LisaXu
    Icon for New Contributor rankNew Contributor
    2 years ago

    Hi Aqid:

    Thanks for your kindly support, we are doing review for PCB trace length. we need your reply to determine need add repeater or not.

    Best Regards

    Lisa