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DP83826E: Multiple PHYs with common SMI bus

Jessica Riley2
Prodigy 220 points
Part Number: DP83826E
Other Parts Discussed in Thread: DP83849I

From the DP83826E datasheet:

"Up to 8 PHYs can share a common SMI bus. To distinguish between the PHYs, during power up or hardware
reset, the DP83826 latches the Phy_Address[2:0] configuration pins to determine its address."

Are there any example schematics or block diagrams for this architecture? 

I have a single MII/RMII/RGMII interface that I need to connect to two separate ethernet output ports and I'm wondering if the DP83826E will meet my needs.

Thank you and best regards,

Jessica

  • +1
    TI__Mastermind 19250 points

    Hi Jessica,

    SMI is a communication interface to program the device and is not involved with data transfer from the MAC.

    DP83826E is a single port MAC to Copper data transfer PHY and can't support the use case you are proposing.

    You can try our dual port PHY DP83849I and look through the section 5.4.4.3.

    --
    Regards,
    Gokul.