• State
  • Locked Locked
  • Replies 5 replies
  • Subscribers 33 subscribers
  • Views 165 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

DP83867IR: DP83867IR Register settings

shuhei hayashi
Prodigy 150 points

Part Number: DP83867IR

Hi All,

I have a question DP83867IR Register settings.
We confirmed that the compliance test passed using the following application note.
Please see the following document.(How to Configure DP8386x for Ethernet Compliance Testing)
www.ti.com/.../snla239d.pdf

image.png

On page 16 of this application note, we confirmed that if the "0x1D5" register setting is not executed, the compliance test (whether the product complies with the product standards) will fail.

However, the latest datasheet for the DP83867IR (Changes from Revision F (October 2019) to Revision G (August 2022)) states that "Removed Reg 0x01D5 Programmable Gain Register (PROG_GAIN)".
In the latest datasheet, the description of "0x1D5" has been deleted.
www.ti.com/.../dp83867ir.pdf

image.png
We are currently setting the "0x1D5" register as described in the application note, but am I correct in understanding that the "0x1D5" setting is not necessary during actual operation?
Also, please kindly tell me why the register setting "0x1D5" is no longer necessary in the latest data sheet.

Best Regards,
Hayashi

  • 0
    TI__Mastermind 24721 points

    Hi Hayashi-san,

    0x1D5 setting is not necessary in actual operation but some customers like to keep it ON since they kept it ON for the compliance test.

    About the datasheet change, we intended to remove certain bits of the register that are not related to the operation of DP83867IR but the entire register was removed.

    The 1D5 register with the bit that toggles the increased swing for the MDI signal will be back in the next revision of this datasheet. Currently, we hope to include this change in early 2026.

    Best,

    J

  • 0 in reply to J
    Prodigy 150 points

    Hi J,

    Thank you for your answer.
    As a result, is my understanding correct that TI recommends changing the 0x1D5 setting to 0xF508 during actual operation?

    Best Regards,
    Hayashi

  • 0 in reply to shuhei hayashi
    TI__Mastermind 24721 points

    Hi Hayashi-san,

    To use the device in a way that passes the compliance test, TI recommends to use 1d5 setting.

    Best,

    J

  • 0 in reply to J
    Prodigy 150 points

    HI J-san

    I'm sorry again.
    >To use the device in a way that passes the compliance test, TI recommends to use 1d5 setting.
    As a result,is my understanding correct that TI recommends changing the setting from 0x1D5 to 0xF508 during actual operation?

  • 0 in reply to shuhei hayashi
    TI__Mastermind 24721 points

    Hi Hayashi-san,

    We do not necessarily recommend to enable 1d5 setting. The PHY is operational with or without this setting enabled. 

    This is because, this PHY was designed before more customers started running compliance test. Therefore, this register was introduced to ensure that the PHY can pass the compliance test.

    I would recommend the customer to keep this setting ON if the customer would like to keep the same setting they used to pass the compliance test.

    Best,

    J