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DS90UB948-Q1: Internal Pattern

Prodigy 120 points

Replies: 7

Views: 163

Part Number: DS90UB948-Q1

Hello,

I am trying to output a pattern on a display using the internal generation function. I configured everything as in SNLA123d application note but I can only see the backlight. Could you help me ? I just want to output something. Why if a follow the 4.3 chapter sequence still no output can be seen ?

  • Hello,

    Can you please send your panel timing specifications and the programming steps you have used? Also what hardware are you using? The 948 EVM or a custom board?

    Best Regards,

    Casey 

  • In reply to Casey McCrea:

    It's a custom board. I'm following the 4.3 section from http://www.ti.com/lit/an/snla132d/snla132d.pdf application note. 

  • In reply to Casey McCrea:

    Can you give to me a command sequence in order to output a pattern ? I analysed the output lines and I can only see  the CLK1 and CLK2 active, data lines are always high.

  • In reply to user5319856:

    Hello,

    You can try following the exact code provided in section 4.3 of the app note. If you use an all white pattern 0x64 = 0x11, then the only data lanes you will see toggling are the D2 and D6 lanes which contain the sync signals. The other lanes will contain all white data (zeros). 

    For more dynamic data, you could try using color bars. 0x64 = 0x05

    Best Regards,

    Casey 

  • In reply to Casey McCrea:

    I can only see the clock pins toggling, all other pins (including D2 and D6 are inactive).

  • In reply to user5319856:

    Hello,

    Are you testing with the TI EVM or a custom board? I would suggest if you are still having problems to try using a 948 Eval board for reference. 

    Best Regards,
    Casey 

  • In reply to Casey McCrea:

    Hello,

    Were you able to test with the TI EVM? 

    Best Regards,

    Casey