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Linux/DS90UB954-Q1: UB954 colorbar output signal issue

boycchi
Expert 1005 points
Part Number: DS90UB954-Q1

Tool/software: Linux

Hi,

I am debug on our custom ub954 board and trying to output colorbar(refer to Code Example for Pattern Generator of datasheet) to the main processor,however,could not get any image from ub954.

I've checked the signal of csi2 clk lane and data lane,following are the screen pics of these signal(First one is clk lane and second is data lane).It seems not correct.

FYI,schematic is attached below,and the input crystal oscillator is 25M for non-synchronous mode

  • 0
    TI__Mastermind 30515 points
    it sounds the output has signal. questions:
    1. how do you measure? scope's settings...
    2. for the hardsare, you can check the power supply pins.
    3. for the reg. setting, pls check whether the CSI2 output is set correctly? 0x20/0x33, etc.

    regards,
    Steven
  • 0 in reply to Steven(Shenzhen) Shi
    Expert 1005 points
    Hi,
    Thanks for your reply
    1.The Oscilloscope is 250MHz 5GS/S,and all the infomation is on the pics I posted.
    2.The voltage of the power supply pins are all right.
    3.for the reg setting,I 've checked the 0x20 which is 0x30 and 0x33 is 0x01,and I thought that it's no need to config these regs(default settings should be ok)
    4.Do u have any other suggestions?The wave form looks different from other csi2 lane
  • 0 in reply to boycchi
    TI__Mastermind 30515 points
    the bandwidth of scope is not good to capture the correct waveform of CSI2 output, you can try >=2GHz bandwidth scope to capture it.
    if supplies and control pins are correct, you can try the pattern gen. to verify it is UB954's issue or the paired receiver issue.

    regards,
    Steven