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DP83869HM: What is the purpose of the three supply configuration?

Part Number: DP83869HM

Hi Team,

As per the title, can you please explain what is the purpose of the three supply configuration? (https://www.ti.com/lit/ds/symlink/dp83869hm.pdf#page=97)

Aslo, can you tell me how to calculate the Ferrite Bead Requirements on power rails? (Current, Impedance @ 100MHz). this information is not available in Datasheet, or can I use the IFSC0806AZER1R0M01 from EVM design?

Thanks!

Regards,

Marvin