DP83867IS: DP83867IS X_I Query

Junehar Kevin J

Part Number: DP83867IS

Tool/software:

Hi,

In our current design we changed the VDDIO from 1.8V to 2.5V, RGMII and IO levels are changed to 2.5V with respect to MAC interface. X_I clock input is referenced to VDDIO or 1.8V Clock source.

Thanks

Kevin

over 1 year ago

0 Hillman Lin over 1 year ago

TI__Mastermind 25955 points

Hi Kevin,

Yes you are correct, the XI input clock range need to reference 1.8V.

Regards,

Hillman Lin

0 Junehar Kevin J over 1 year ago in reply to Hillman Lin

Prodigy 90 points

Hi Hillman,

Our config: VDDIO=2.5V, VDDA2P5=2.5V, VDD1P0=1.0, VDDA1P8 = no external supply.

I still have a confusion how that pin is referring to 1.8V.

Ours is two supply configuration mode.

Please share your comments.

Thanks & Regards

Junehar Kevin J

0 Hillman Lin over 1 year ago in reply to Junehar Kevin J

TI__Mastermind 25955 points

Hi Kevin,

Clock circuitry is independence with other block inside the PHY. In DP83867PHY, it require 1.8V clock input if customer is using oscillator. If input clock supply is the main concern, we recommend using crystal structure.

Regards,

Hillman lin

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DP83867IS: DP83867IS X_I Query