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dp83867IRRGZR PHY ADREES

keiven Wang
Intellectual 260 points
Other Parts Discussed in Thread: DP83867IR

Dear all

my customer use ZYNQ7020+DP83867IRRGZR,  but there has a problrm  is that when we configue phy address is 00000,but  actually the address is 01111 and another dp83878IRRGZR PHY ADREESS we configure 00001,but actually is 01110,so  does our DP83867IRRGZR Datasheet's error?

So  please sure it   

We refer to this datasheet  www.ti.com/.../dp83867ir.pdf  , page 47 RXD2 and RXD0 configure Phy address,we use DP83867IRRGZR

  • 0
    TI__Mastermind 19780 points
    Hi Keiven,

    If this is happening, the ZYNQ7020 probably has internal pull-ups on the MAC that are causing the PHY to be strapped into the incorrect mode.

    I would need to see the schematic to learn why this strapping is incorrect.

    Best Regards,
  • 0 in reply to Rob Rodrigues
    Prodigy 10 points

    Hi Rob,

    the schematic  is as shown in the attachment ,  during dp83867IRRGZR reset , the voltage of ETH1_RXD0 is within the mode 2 of  strap configuration; but  phy address actually is 01110.

    Then we change ETH1_RXD0 into mode 4 of  strap configuration by pull-up 2.49K resistance, the voltage of ETH1_RXD0 is also  within the mode 4 during dp83867IRRGZR reset , but  phy address actually is 01111.

    So  please sure it.

    base_v11.pdf

  • 0 in reply to huanyan wu
    Prodigy 30 points

    Your MAC have pull-up pin by default. For mode 0 do't use "open" - "open" case. But use 2.49 K pull-down resistor and pull-up leave "open"

  • 0 in reply to Tatiana Smelaya
    TI__Mastermind 18425 points
    Thank you Tatiana for your suggestion!

    Hi Keiven,

    From your explanation it does look like there is an internal pull-up resistor in the MAC. I would recommend to check with the MAC manufacturer or in the MAC datasheet if the value of internal pull-up is listed. Using the value of internal MAC resistance and internal PHY resistance, you can calculate the value of the external resistance required for Mode 1 and Mode 2 configuration.

    -Regards,
    Aniruddha
  • 0 in reply to Aniruddha Khadye
    Intellectual 260 points
    Hi Tatiaana

    your are right there does have a pull-up resistor in the MAC , so ZYNQ datasheet have a error, now we find this error, our DP83867IR is OK, thanks.