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DP83869HM: In RGMII to SGMII bridge mode, is it really impossible to use MII instead of RGMII on the MAC side when forcing the SGMII to 100Mbps in the PHY?

MS1101
Prodigy 10 points
Part Number: DP83869HM

Hello,

From this post, it seems that the DP83869HM does not support MII interface on the MAC side in RGMII to SGMII mode:

DP83869HM: Lowest Power MAC to SGMII Solution - Interface forum - Interface - TI E2E support forums

What happens if the RGMII_MII_SEL bit 0x1DF[5] is set to '1' in the RGMII to SGMII bridge mode?

Thank you.

  • +1
    TI__Mastermind 25945 points

    Hi,

    Thank you for reaching out for clarification. DP83869PHY support MII interface. From Theoretical standpoint, DP83869PHY should support MII to SGMII bridge mode. 

    Unfortunately, our EVM cannot bring up this application since it is not a commonly used application. Just want to clarify DP83869PHY should support MII to SGMII bridge mode.

    --

    Regards,

    Hillman Lin

  • 0 in reply to Hillman Lin
    Prodigy 10 points

    Hi Hillman,

    I see. The EVM doesn't bring pins 21 and 46 to the header J14 (unpopulated). However, since pin 21 can be accessed at J17 (unpopulated) and pin 46 can be accessed at J4 (populated), do you think that we can validate this by ourselves using the EVM?

    Thanks.