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DP83561-SP: RGMII skew settings

Tijana Igic1
Prodigy 140 points

Part Number: DP83561-SP

Tool/software:

Hello,

What is the clock 90 output? It's only refenced in 7.6.1.43 Table 7-54 of the part specification. 

There's no definition elsewhere. Also the RGMII skew is selectable only by software, not the straps, correct?

Thank you!

  • 0
    TI__Mastermind 19621 points

    Hi Tijana!

    CLK_90 is referring to the RGMII Clock delays, apologies for the ambiguity in the data sheet. 

    You are correct, the RGMII delays must be set via software, i.e. through the MDC/MDIO interface to access the PHY's registers (Register 0x86 to configure the RGMII delays). The default setting will be a 2.0ns delay on both TX & RX CLKs.

    Regards,

    Alvaro