• State TI Thinks Resolved
  • Locked Locked
  • Replies 7 replies
  • Answers 4 answers
  • Subscribers 33 subscribers
  • Views 535 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

DP83869HM: interface between our RGMII and the user's SGMII link?

Marvin Cantos
Expert 5365 points
Part Number: DP83869HM
Other Parts Discussed in Thread: DP83869

Hi Team, 

Good day. I am posting this inquiry on behalf of the customer.

We have a need to interface with user equipment's SGMII (dual ports).

The processor that we are using only has dual port RGMII.
Can I use the DP83869HMRGZT to facilitate the interface between our RGMII and the user's SGMII link?
Does Ti have a dual port RGMII to SGMII part?
Below is the drawing of the interface.
Can we use the DP83869 for this interface?
Please help to advise. Thank you for extending your support.
Kind regards, 
Marvin
  • 0
    TI__Mastermind 34395 points

    Marvin,

    DP83869 can help via bridge mode, but it will be extremely important that there is speed uniformity across the signal chain. RGMII can determine speeds via RX_CLK, while SGMII has auto-negotiation.

    Sincerely,

    Gerome

  • 0 in reply to Gerome Cacho
    TI__Expert 5365 points

    Hi Gerome, 

    Thank you for your response. I received additional information from the customer.

    Now I know more details about the RGMII SGMII interface between our design and the customer (user side), things may be more complicated.
    What I like to have is two RGMII ports from two MAC to be interfaced with two SGMII ports of the other two MAC as shown below.
    MAC 1 is to communicate with MAC 3
    MAC 2 is to communicate with MAC 4
    I am looking for either two devices each can perform MAC RGMII interfacing with another MAC SGMII
    Or a single device that has dual ports MAC RGMII interfacing with dual port MAC SGMII.

    Please help to advise. Thank you for extending your support.

    Kind regards, 

    Marvin

  • 0 in reply to Marvin Cantos
    TI__Mastermind 34395 points

    Marvin,

    2x DP83869's may help with this application so long as there is no swapping who talks with who.

    Sincerely,

    Gerome

  • 0 in reply to Gerome Cacho
    Prodigy 20 points
    Gerome Cacho said:
    so long as there is no swapping who talks with who
    Gerome commented: "2x DP83869's may help with this application so long as there is no swapping who talks with who."
    What does Gerome mean when stating: so long as there is no swapping who talks with who?
    Does this imply there is a master MAC and only the master MAC can initiate the communication?
    Could Gerome elaborate with more details about: so long as there is no swapping who talks with who?
  • 0 in reply to Dung Huynh
    TI__Mastermind 34395 points

    Dung,

    So long as PHY1 and MAC3 are connected together, and PHY2 and MAC4 are likewise, this should be fine. It would not be fine if there is dynamic switching between MACs where MAC1 might be required to talk with MAC3 and MAC4.

    Sincerely,

    Gerome

  • 0 in reply to Gerome Cacho
    Prodigy 20 points

    Could the DP83869 when configures as bridge mode (RGMII-SGMII) support all three speeds, 10, 100, 1000Mbps?

    Thanks

    Dung Huynh

  • 0 in reply to Dung Huynh
    TI__Mastermind 34395 points

    Dung,

    It can support all speeds. Just make sure the speeds are uniform throughout the signal chain.

    Sincerely,

    Gerome