DP83867IR: Compatabilty check with DP83865 phy

Pavithran Gunasekaran

Prodigy 30 points

Part Number: DP83867IR
Other Parts Discussed in Thread: DP83865,

HI ,

In our previous design, we utilized the DP83865 PHY chip, which functioned effectively for our purposes.

However, we recently replaced it with the DP83867IR PHY chip as a one-to-one substitution.

Unfortunately, the new PHY chip is not responding as expected.

Please find attached the schematics for both versions. Kindly review them and advise if any modifications are necessary.

1) Can you confirm if the PHY address connection in the new schematic design matches that of the existing design?

2) In the new design, we have added 33-ohm resistors in RX_D0 to RX_D7, which are required for this chip?

Thanks

Pavithran Guansekaran

3 months ago

0 Hillman Lin 3 months ago

TI__Mastermind 19725 points

Hi Pavithran,

If you are looking for PHY_ID in the new design. The strapping is correct.
33 ohms on the MAC interface is not required for DP83867.

Regards,

Hillman Lin

0 Pavithran Gunasekaran 3 months ago

Prodigy 30 points

Hi,

Thank you for your quick response.

We have replaced the PHY chip from DP83865 with the DP83867IR chip.

Kindly confirm if the 33-ohm resistors on the MAC interface (TX_CLK, GTX_CLK, PHY_CLK, TX0-TX7, TX_ER, TX_EN, RX_ER, RX_DV, RX0-RX7) are not required for the DP83867IR chip.

Also, please confirm if any resistor value changes are needed for the new PHY chip design (DP83867IR).

Thank you.

Pavithran Gunasekaran

0 Hillman Lin 3 months ago in reply to Pavithran Gunasekaran

TI__Mastermind 19725 points

Hi Pavithran,

Here are some feedback for customer's new DP83867 PHY design:

We don't want any pull up resistor and decoupling caps on the MDI lines.
Please follow the MDI lines connection for DP83867PHY:

We also have schematic checklist that could further help with your design. Please fill it up and let mw know if you have further question:

6165.DP83867_Schematic_Design_Review_Checklist.xlsx

Regards,

Hillman Lin

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DP83867IR: Compatabilty check with DP83865 phy