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DP83TC811S-Q1: DP83TC811S-Q1 PCB Layout question

Amelie Zheng
Genius 10865 points
Part Number: DP83TC811S-Q1

Hi Team,

Could you please give some advice for the following questions about DP83TC811S-Q1 PCB Layout? Thanks!

1. Because of the Layout space, TRD_P and TRD_N need to be tured to the connector by an angle as the attahed picture. Is it ok?

2. Does the CMC common mode inductor just need to dig out the GND on the surface?   

3. How to deal with the GND of the connector? Need to dig the ground?     

4. Is the length between TX and RX of SGMII required to be equal?

  • 0
    TI__Genius 9920 points

    Hi Amelie,

    1. . Because of the Layout space, TRD_P and TRD_N need to be tured to the connector by an angle as the attahed picture. Is it ok?

    The angle is ok, just make sure you have are length matching as well as using a 50 ohm impedance trace width 

    2. Does the CMC common mode inductor just need to dig out the GND on the surface?   

    Can you explain what you mean by dig out the GND on the surface?

    3. How to deal with the GND of the connector? Need to dig the ground?     

    Again, I am not sure what you mean by dig the ground

    4. Is the length between TX and RX of SGMII required to be equal

    The TX and RX do not need to be equal however the differential pairs of TX should be matched as well as the differential pairs for RX

  • 0 in reply to Cecilia Reyes
    TI__Genius 10865 points

    Hi Cecilia,

    Thanks for your reply.


    Customer will lay a ground on the top layout with copper. Here "dig out the GND on the surface" means remove the copper under the CMC or connector.

    Just want to confirm whether need to remove all the GND under CMC and 100 BASE -T1 connector .

  • 0 in reply to Amelie Zheng
    TI__Genius 9920 points

    Hi Amelie,

    That is correct you should remove the GND. You can create a GND Keepout layer on the top layer to prevent there from being any GND on the CMC or connector. 

    Thanks,

    Cecilia