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DS90UB940N-Q1: how to set DS90UB940N register

Amy Luo
Expert 6895 points
Part Number: DS90UB940N-Q1

Hi team,

One of our customers has some problems with the application of DS90UB940N-Q1. I forward his question as follows:

We now have a design:  DS90UB947 generates a 1920*720@50hz RGB signal , now DS90UB940 need to convert  into the corresponding YUV signal to the platform SOC.

Now the platform can receive the CSI signal generated by 940, but there are some problems in display color and resolution (Inconsistent with the content displayed at the input end), such as attachment video. If we have any problem with the setting of 940 register, please help us to have a look. Thanks very much!

Best Regards,

Amy Luo

  • 0
    TI__Guru 66810 points

    Hi Amy, 

    Can you provide: 

    • Schematics
    • Script files for initialization
    • Register dump of ser and des
    • Other questions
      • Does all displays have this issue?
      • Does patgen have this issue? 

    Regards, 

    Logan

  • 0
    Prodigy 220 points

    Dears，

    I am responding to this question on behalf of the client.

    940 Schematics and  Register initialization add as attachment , Patgen picture add in attachment as well .

     940_issue.rar

    Does all displays have this issue?

    ==>yes 

    Does patgen have this issue? 

    ==>yes

  • 0 in reply to Verna Hong
    TI__Guru 66810 points

    Hi Verna, 

    Thank you for the information. 

    I will review this and get back to you and Amy with feedback/additional questions early next week. 

    Regards, 

    Logan

  • 0 in reply to Logan Cummins
    TI__Guru 66810 points

    Hi Amy/Verna, 

    Thank you for your patience on this. 

    Looking at the schematic, I see that the CSI signals are going into another device prior to the display. I presume this is acting as a switch between the 940 and another video output from other device?

    Can you verify the CSI data format is correct based on the display attached? I see the script has both RAW10 and YUV422 listed.

    It would be helpful for a full register dump of the 940 as well (main page and CSI registers). 

    Regards, 

    Logan