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DP83TD510E-EVM: Connecting different PHY to 510E-EVM

Jan Noak
Prodigy 50 points
Part Number: DP83TD510E-EVM
Other Parts Discussed in Thread: DP83822I

Hello,

I am currently trying to construct a media converter using the 510E SPE-PHY.
In different products we use a non-TI regular PHY (LAN8720A) that I would like to continue using for the media converter together with the 510E.

I connected both PHYs through RMII, I bascially used the Eval Board and connected the other PHY instead of the DP83822I.
When using the standard SPE-PHY configuration I get no link. However when using different non-TI SPE-PHYs I can use the LAN8720A to build a media converter.

I already searched through all the strapping options, I made sure the Eval Board runs out of the box, which it did just fine and I checked all the RMII connections aswell as the clock.

Is there any restrictions on using the 510E with different PHYs in media conversion mode or am I missing some register inputs?

Thanks a lot for your suggestions.

Greetings,

Jan

  • 0
    TI__Mastermind 19621 points

    Hi Jan,

    How is the LAN8720A configured? Media Conversion won't work if both the 510 and 8720A are Masters (both of them as Slaves will work).

    Also, Pin 18 RX_DV/CRS_DV needs to be configured as RX_DV for Media Conversion. The LAN8720A would need it's pin configured the same way.

    To my knowledge, there shouldn't be any restrictions on using the 510E with different, Non-TI PHYs.

    Please let me know if this helps solve your problem.

    Regards,

    Alvaro

  • 0 in reply to Alvaro (Al-vuh-roe) Reyes
    Prodigy 50 points

    Hi Alvaro,

    thanks for the answer.

    The 8720A does not have a possibility to configure it as master or slave, according to the datasheet. However, I tried it with the 510E in master mode, feeding the clock to the 8720A and I also tried the 510E in slave mode, feeding the same 50 MHz Oscillator to both PHYs.

    The 510E is configured for media conversion, the 8720A however does not have a way to configure the RX_DV pin (according to the datasheet).

    What is confusing me though is, that I can use another SPE-PHY (Analog Devices ADIN1100) and get the communication to work. Do you know if the 510E does anything different that prevents communication to the 8720A?

    I checked all the registers from both PHYs in a working and non-working condition.

    The 8720A has the same register values in both cases, so there should be no error here I suppose.

    The 510E has almost the same register values. In register 0x12 the link_int bit is 0 when connected to the 8720A and in register 0x13the reserved bit 8 is a 0 and page_int is also 0.  I don't know if that's supposed to happen.

    Thanks for your answer.

  • 0 in reply to Jan Noak
    TI__Mastermind 19621 points

    Hi Jan,

    Are you using out 510 EVM? If so, are you connecting it directly to the LAN8720A via the inter-board connector? Attached is our 510 schematic checklist. Could you go through this and see if anything inside helps?

    7242.DP83TD510_Schematic_Design_Review_Checklist.xlsx

    Regards,

    Alvaro

  • 0 in reply to Alvaro (Al-vuh-roe) Reyes
    Prodigy 50 points

    Hello Alvaro,

    I checked through every connection, even measured them, they're all fine. 

    I suppose it is not working because the LAN8720A does not have the RX_DV Pin like the DP83822, it only has the CRS_DV Pin.

    Could you explain the difference and why it doesn't work for the CRS_DV Pin? And do you maybe know why the back to back connection works with a different PHY? Are there different ways to utilize the media converter mode?

    That would really help me to understand this topic, especially for planning future products.

    Regards,

    Jan

  • 0 in reply to Jan Noak
    TI__Mastermind 19621 points

    Hi Jan,

    I'm puzzled too, could you share the filled out checklist, provide a schematic, Reg dump (0x00-0x1F) of  the 510 , and a photo of the setup please?

    Regards,

    Alvaro