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DP83TC813R-Q1: RGMII both XI and TX_CLK inputs are required?

Masatoshi Oguri
Expert 4780 points
Part Number: DP83TC813R-Q1

Hello,

In RGMII mode, I think clock input at 25MHz is required to TX_CLK pin. It seems another 25MHz clock input is necessary to XI (and XO) pin. However, in Fogure 9-4 there is no XI clock input. Does it require different 25MHz clock inputs to both TX_CLK and XI pins? Or the clock to XI can be omitted?

Thank you.

Regards,

Oguri (TIJ automotive FAE)

  • 0
    TI__Mastermind 39785 points

    Hi Oguri-san,

    Thank you for your query. This is a typo and we shall look to correct for this in our latest revision. The PHY needs a 25MHz Reference clock at the XI pin for RGMII, as well as another 25MHz signal from the MAC to its TX_CLK.

    Sincerely,

    Gerome