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RM48L952: Unable to read PHY ID from External PHY(ADIN1200)

Nagaraju M
Prodigy 95 points
Part Number: RM48L952


Hi TI,

I'm using ADIN1200 external PHY for RM48 via MDIO. I'm using RM48 emac example code  to read the PHY ID of the ADIN1200 (ADIN1200 (Rev. 0) (analog.com)). The PHY1 Address is "1" and PHY2 Address is "3". but I'm unable to read the PHY ID of the external PHY. can you please help me on this.

with regards,

Nagaraju M

  • 0
    TI__Guru**** 197566 points

    Hi Nagaraju,

    Is the ADIN1200 clocked with 25mHz clock signal? Per PHY (SDIN1200) spec, the minimum MDC period is 180ns, and the maximum MDC (MDCLK) for the PHY is 5.5MHz. The maximum MDCLK of RM48 device is 2.5mhz. Is the MDCLK beyond this valid range (<2.5MHz) in your config?