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Original question:

DP83822IF: 10Base Harmonics test at Complaince test

DP83822IF: 10BASE-Te Harmonics Test

Davin Nicholas
Prodigy 60 points
Part Number: DP83822IF

I read this thread: https://e2e.ti.com/support/interface/f/138/t/745280?tisearch=e2e-sitesearch&keymatch=DP83822IF. What seems to be missing is a test mode where it outputs all 1's as a Manchester encoded packet repeatably. The compliance test software from Tek that we use triggers off of TP_IDL to repeatably capture the data. Using register 0x0027 with the test pattern of 0011 - Repetitive 1 puts out a pure tone sine wave, not Manchester encoded. Thus, forcing a TP_IDLE forcing the test pattern TP_IDLE_00 at the end of the test pattern 0011 would test the pure tone and not the Manchester encoded data. Is there a way to force an all one's Manchester encoded packet as required per 802.3-2012 Section 1 Clause 14.3.1.2.1?

  • 0
    TI__Genius 11900 points

    Hello Davin,

    It looks like we've received this request offline and the team will discuss it there.

    Thanks,

    Vibhu

  • 0
    TI__Genius 11900 points

    Hello Davin,

    You are correct, using register 0x0027 you cannot generate the Manchester encoded 1's required by the 10BASE-Te harmonic test.

    "Is there a way to force an all one's Manchester encoded packet as required per 802.3-2012 Section 1 Clause 14.3.1.2.1?"

    This cannot be done using the PHY alone, you will require to use a link partner to generate the test pattern, with the DP83822 configured to reverse loopback (register 0x16) to send the data to the TP Test Card.

    I am closing this thread, I expect Carl will reach out to you with additional information.

    Thanks,

    Vibhu