DP83822H: XI necessary / unnecessary?

Kenji Ohno1

Genius 5095 points

Part Number: DP83822H

Hi Team,

The description of XI is described as for RMII reference clock.

Is there no need for XI input if you do not have RMII access?

If I pull the PWDN pin low, can I shut off the clock input to XI?

Best Regards,

Kenji

over 6 years ago

0 Geet Modi over 6 years ago

TI__Mastermind 26320 points

XI and XO pins provides Clock to DP83822 PHY. If PHY is used in RMII Master, MII or RGMII, these pins needs to be fed 25 MHz clock from external XTAL or Oscillator. For RMII Slave Mode, XI pins needs to be fed with 50 MHz clock input.

During PWDN, clock is needed as MDIO/MDC access is allowed to host.

Regards,
Geet

0 Kenji Ohno1 over 6 years ago in reply to Geet Modi

Genius 5095 points

Hi Geet,

Thank you for your answer.

In any case, I understand that XI requires a clock.

Best Regards,

Kenji

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DP83822H: XI necessary / unnecessary?