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DP83822I: eye diagram

Gene Qiu
Intellectual 1720 points

Part Number: DP83822I

Hi team

When using Dp83822i, customer got below eye diagram, and fail the eye diagram test, the blue area is above the yellow line. 

1, Is there any config either hardwar or software that could adjust the output capability to wider the output to ensure cover the blue area?

2. What is the purpose of the RBIAS pull-down resistor in datasheet, i am not sure whether this pin can be adjusted to adjust the eye diagram?

Best Regards

  • 0
    TI__Genius 16030 points

    Hello Gene,

    Do you suspect extra loading on the traces connecting PHY to the connector? You may try register <0x0404> = 0x0024. Rbias sets the internal bias currents for the PHY. Is the value different from 4.97K on the board?

    --

    Regards,

    Vikram