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DP83867E: Strapping Pins set for SGMII

joe lindula
Mastermind 6930 points
Part Number: DP83867E

Hello, I am using the DP83867E Transceiver with an SGMII input. I need some help setting up the Strapping Pins. Here is what I have so far:

RX_DO Mode 4

RX_D2 Mode 4

RX_CTRL Mode 4

GPIO_0 Mode 4

GPIO_1 Mode 4

Led_2 Mode 4

Led_1 Mode 4

Led_0 Mode 4

RX_D1 and RX_D3 have same strapping pin resistors as RX_D0 and RX_D2 respectively.

Mode          IDEAL Rhi      IDEAL Rlo

1                 open              open

2                 10K                2.49K

3                5.76K             2.49K

4               2.49K             OPEN   ( page 36 says for RX_D0, RX_D1, RX_D2, RX_D3 use Rhi 4K and Rlo 10K for SGMII)

So, I should have the following

Rhi for RX_D0,RX_D1,RX_D2,RX_D3 use a 4Kohm 

Rlo for RX_D0,RX_D1,RX_D2,RX_D3 use a 10Kohm

Rhi for RX_CTRL, GPIO_0, GPIO_1, LED_2, LED_1, LED_0 use a 2.49Kohm

Rlo for RX_CTRL, GPIO_0, GPIO_1, LED_2, LED_1, LED_0 use OPEN

Please me know if I have the right resistor values.

Thanks,

Joe

  • 0
    Mastermind 6930 points

    ARM_DSP 36.pdf

    I attached a schematic view of my circuit. 

  • 0 in reply to joe lindula
    TI__Mastermind 26320 points
    Hi,

    Strap settings shall be aligned to your application needs.

    What Phy Address your want to configure ?, whether you want to disable Auto-Neg etc...


    Only comment I have is GPIO_0 : Mode 4 is not applicable. You shall choose Mode 1 or Mode 4. Please refer to datasheet Table 6 "4 Level Straps" to understand the strap configured for each of pin.


    Regards,
    Geet
  • 0 in reply to Geet Modi
    Mastermind 6930 points
    Geet,

    Hello, thank you for responding to my post. On page 36 the datasheet it says that for RX_D0, RX_D1, RX_D2, RX_D3 use Rhi 4K and Rlo 10K for SGMII), so the other pins would use the resistors in Table 5. For example, if I want GPIO_1 set to mode 4, then I would use a 2.49K for Rhi, is that correct?

    Last, I'm using SGMII so on GPIO_0 I would choose mode 1, is that correct? You say "choose Mode 1 or Mode 4.

    Thanks,
    Joe
  • 0 in reply to joe lindula
    TI__Mastermind 26320 points
    Hi Joe,

    SGMII has 6 signals, SGMII_SON/SOP, SGMII_SIN/SIP, SGMII_COP/CON defined across RX_D3/D2, RX_D1/D0, TX_D0/TX_D1. Given SGMII is LVDS, to balance the signal, if your applications needs to have strap on one of the pins eg, SGMII_SON/SOP, you need have the same strap on the both pins. I hope it clarifies.


    Please choose the straps as needed by your application. only requirement is to balance the differential signal by keeping the same value of strap on pairs.

    Regards,
    Geet
  • 0 in reply to Geet Modi
    Mastermind 6930 points
    Now I understand. Thank you