• State Resolved
  • Locked Locked
  • Replies 4 replies
  • Answers 1 answer
  • Subscribers 32 subscribers
  • Views 161 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

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: waveform adjust for compliance test

k-yama
Prodigy 10 points
Part Number: DP83867IR

Tool/software:

Hi, team.

Could you let me know about registers "0xA0" and "0xA6" in detail?

I created prototype board with DP83867IR on it.
I tested 10BASE-T compliance test, but MAU test is failed.
I researched E2E support forums,I learned that waveforms are adjustable.
I checked waveforms as I changed the registers. Please refer to an attached Excel file.
Registers "0xA0" and "0xA6" seem to be adjusting amplitudes.
However,there are no discription the difference between "0xA0" and "0xA6".
Could you let me know about registers "0xA0" and "0xA6" in detail?
I will tune waveforms, after I understand what the registers mean.

Related E2E forums

DP83867CS: 1000Base-T Compliance Test Difference A,B Peak Output Voltage FAIL - Interface forum - Interface - TI E2E support forums

DP83867CR: 10Base-Te MAU test - Interface forum - Interface - TI E2E support forums

DP83867IR: 10Base-Te / 100Base-TX / 1000Base-T Compliance Test - Interface forum - Interface - TI E2E support forums

DP83867IS: DP83867 Compliance test - Interface forum - Interface - TI E2E support forums

DP83867_Waveform_adjust.xlsx

Best regards.

  • 0
    TI__Mastermind 32485 points

    Hello,

    Please refer to our datasheet for information of Reg 0xA0. Please note these are trimmed values and thus will vary across different parts. These are swing registers for each channel.

    Unfortunately, we cannot reveal any information regarding Reg 0xA6.

    Before adjusting registers, I would strongly advise that you double check your design against our schematic and layout checklists (available in the product folders). Layout/Schematic choices will have bigger impact and can help keep results consistent as possible. 

    Sincerely,

    Gerome

  • 0 in reply to Gerome Cacho
    Prodigy 10 points

    Hi, team.

    Thank you for your reply. I understand.

    I have two more questions.
    (1)Where is 0xA0 discribed in datasheet?
    I didn't find it.

    (2)Are 0xA2/0xA3 trimmed values, and thus will vary across different parts same as 0xA0?
    I may need to adjust 0xA2/0xA3 for 1000BASE-T compliance test.

    Best, regards.

  • +1 in reply to k-yama
    TI__Mastermind 32485 points

    Hello,

    Reg 0xA2/A3 are not trimmed values and should be static default per datasheet. 

    Please refer to Page 90 area of SNLS484H.

    Sincerely,

    Gerome

  • 0 in reply to Gerome Cacho
    Prodigy 10 points

    Hi, team. Thank you for your reply.


    I found 0x00A0-0x00A3 registers in the latest version of the datasheet.
    I was looking at an older version of the datasheet.

    Best, regards.