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SN75DP130: DP130 skipped in test...

Peter Tseng
Mastermind 6230 points
Part Number: SN75DP130

Dear Sir,

My customer test DP130 with several Gain setting, however, they found there was skipped test at 6dB 400mV setting.

Their platform is intel coffee lake.

Others setting such as 0dB 400mV, 3.5dB 400mV, 6dB 600mV were be able to test even the result are pass or fail.

Attached files are test report.

Can you help to advise what should we do to test under this setting?

Thanks.

DUT001_257_400_6.pdfDUT001_229.pdf

  • 0
    TI__Guru**** 178566 points
    Peter

    DP130 is a limited redriver, which will only snoop the AUX bus. I don't know how it will cause the test to skip. Do you have any more detail on this skipped test?

    Thanks
    David
  • 0 in reply to David (ASIC) Liu
    Mastermind 6230 points

    Hi David,

    I did not know the test detail either!

    However, per test report, it seems for eye diagram testing of Lane0~lane3.

    Did you have any idea about this test item?

    Thanks.

  • 0 in reply to Peter Tseng
    TI__Guru**** 178566 points

    Peter

    My understanding is that if the pattern fails and user selects Skip test if validation fails option then status of that test will be ‘Skipped’. In case the user selects ‘Reacquire’ and it fails to acquire good pattern in 10 attempts, then that pattern will be skipped from acquiring. 

    But for HBR2 eye diagram, you can use any SWING and Pre-emphasis setting, and from the report, you do have SWING and Pre-emphasis setting that can pass eye diagram, so I am not sure why you would choose 400mV 6dB option for the test. 

    Thanks

    David

  • 0 in reply to David (ASIC) Liu
    Mastermind 6230 points

    Hi David,

    As your information for HBR2 testing, "Any passing" is OK.

    However, what customer got was "Skipped".

    After discuss with customer, they can accept pass or fail since both of them are "test result", but skipped was not.

    And, customer did all test but these 4 items always be skipped even they did not set any skip related setting.

    Did you ever meet such issue before or have experience and any advise for this issue?

    Thanks.

  • 0 in reply to Peter Tseng
    TI__Guru**** 178566 points
    Peter

    I use Keysight scope in the lab, so my experience with Tek scope is limited.

    I don't know why the Tek scope will go through different combination of SWING and Pre-emphasis level because the DP1.2 CTS spec says any SWING and Pre-emphasis combination can be used to pass the test. I think with 400mV, 6dB, it is possible that the eye is being over-equalized, and In case the Tek scope fails to acquire good pattern in 10 attempts, then that pattern will be skipped from acquiring.

    You may want to reach out to Tek support and see their response on this skipped test.

    Thanks
    David
  • 0 in reply to David (ASIC) Liu
    TI__Guru**** 178566 points
    Peter

    Do you have anymore questions or can I close this thread?

    Thanks
    David
  • 0 in reply to David (ASIC) Liu
    Mastermind 6230 points

    Dear David,

    As customer information, they also used DP130 in other projects and without this test skipped issue.
    What difference between those projects are, only new platform - Coffee Lake had issue, others old platform are not.
    Did you think this will be the major problem of new platform for this issue?
    Thanks.

  • 0 in reply to Peter Tseng
    TI__Guru**** 178566 points
    Peter

    Different system would have different design. Do they have Keysight scope? It would be good if they can run the same test with the Keysight scope and see if the test is passing or failing.

    6dB could cause the signal to be over-equalized, and 400mV perhaps is not enough amplitude to open up the eye with 6dB pre-emphasis.

    Thanks
    David
  • 0 in reply to David (ASIC) Liu
    TI__Guru*** 146990 points
    Peter, do you still have question?