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DP83561-SP: MAC Impedance RGMII

Tijana Igic1
Prodigy 140 points
Part Number: DP83561-SP

Tool/software:

Hello,

For the impedance control, the 35 ohm recommended for RGMII in table 7-59 for MAC_IMPEDANCE_CTRL seems wrong in the specification and does not match the 50 ohm recommendation in 7.3.2 of 50ohms +/-20%.

Is 50 ohms correct and recommended? Do not understand the intent of the 35 ohm note.

Thanks!

  • +1
    TI__Mastermind 19621 points

    Hi Tijana,

    Thank you for pointing out the 35Ω comment, I am unsure about the intent and will verify internally with my team, please allow me about a week to reach out and hear back. The guidance would be to keep the traces impedance matched to 50Ω, no series resistors are needed on the RGMII lines.

    Regards,

    Alvaro