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DS90UB940-Q1: display is abnormal

Betty Guo
Expert 7300 points
Part Number: DS90UB940-Q1

Hi team,

customer use DS90UB940-Q1, found have display issue. we check the normal and abnormal regest, only have below differences, can you help give some comments?

I found the reg 0x1D is difference, normal is 0x42, abnormal is 0x63, is it problems? what's the meaning of reg0x59 and reg0x60  ?

does the 940 have errata about this issue? how about 940N? thank you

the normal reg value:

the abnormal reg value:

difference between normal and abnormal:

issue picure:

  • 0
    TI__Guru** 107810 points

    Hello Betty,

    Are these two different systems or just one system with two different DES ?

    Are there any other differences between the two systems? Layout, schematic, components, cable ... etc ?

    Can you dump the indirect registers, from 0x00 to 0x2F ?

    - 0x1D -- normal is using the old device (940), abnormal is using the new device (940N)
    - 0x3b -- AEQ status, 0x00 is a good value, but 0x1F is a bit too high which means there may be a link issue.
    - 0x59 -- Internal use only
    - 0x6D -- The value written to the Indirect register address shown in reg 0x6C
    - 0xa0 -- This register is not used

  • 0 in reply to Hamzeh Jaradat
    TI__Expert 7300 points

    Hi Hamzeh,

    these are the same system, the same board and cable, no other difference.

    if there have link issue, the LOCK and PASS is high, what will cause the AEQ such high?

    thank you

  • 0 in reply to Betty Guo
    TI__Guru** 107810 points

    Hello Betty,

    please ask them to measure the power-up sequence of the 940 as per figure 45, and provide the plots for review .

    Also they may use our MAP Tool to test their link and see where the AEQ is having good values and where not.