DP83825I: Clock supply to MAC and PHY

Atsushi Takahashi

Part Number: DP83825I

Hi Team,

I have a question about clock supply to MAC and PHY.
Is it no problem to connect Y1-pin of CDCE925PWR to MAC and Y2-pin to PHY(DP83825I)?
Please see the attached.

Best Regards,

CDCE925PWR_MAC_PHY.pdf

8 months ago

0 Hillman Lin 8 months ago

TI__Mastermind 21765 points

Hi Atsuhshi-san,

May I ask what mode is DP83825PHY operate in? RMII master or RMII slave?

If DP83825PHY is operate in RMII slave mode and MAC is good to receive 50MHz, then the diagram you provided should be fine.

Regards,

Hillman Lin

0 Atsushi Takahashi 8 months ago in reply to Hillman Lin

Intellectual 885 points

Hi Hillman-san,

Thank you for your reply.

The customer uses at RMII Slave mode.

I have additional question.

The customer are branching off a single clock output pin to supply the the PHY and the MAC.

Is this not recommended?

+1 Hillman Lin 8 months ago in reply to Atsushi Takahashi

TI__Mastermind 21765 points

Hi Atsushi,

We recommend customer to use the clock signal generate by the MAC with 50MHz.

MAC and PHY share the same 50MHz reference clock signal form Oscillator. it should also be fine.

Regards,

Hillman Lin

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DP83825I: Clock supply to MAC and PHY