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TMS570LC4357: TMS570LC4357: MDIO link is down

sreenivasan m
Genius 3705 points

Part Number: TMS570LC4357

Hi Team,

This is regarding the issue reported in the case :https://e2e.ti.com/support/microcontrollers/hercules/f/312/t/870453

Can you please look into this and provide your inputs.

Regards,
M.Sreenivasan.

  • 0
    TI__Guru**** 200206 points

    Hello,

    Pleased check the PHY datasheet. The PHY may support link-down capability which uses criteria such as RX error count, low SNR threashold, and signal and energy loss to detect link loss. For DP83822, the LINK bit is cleared when one following criteria meets:

    • RX Error Count - when a predefined number of 32 RX_ERs occur in a 10μs window, the link will be dropped.
    • MLT3 Error Count - when a predefined number of 20 MLT3 errors occur in a 10μs window, the link will be dropped.
    • Low SNR Threshold - when a predefined number of 20 threshold crossings occur in a 10μs window, the link will be dropped.
    • Signal/Energy Loss - when the energy detector indicates energy loss, the link will be dropped.