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DS90UB954-Q1: DS90UB954 Reg 0x54 is 02; CSI_SYNC_ERR

Vincent Hsieh
Expert 1895 points

Part Number: DS90UB954-Q1

Dear,

What conditions will CSI_SYNC_ERR in 954? What means is CSI_SYNC_ERR?

How to solve it?

  • 0
    TI__Mastermind 30515 points

    Hi Vincent,

    the link error would cause the CSI sync error. pls check reg. 0x55/0x56.

    To resolve this issue, you need resolve the link bit error issue. when the link noise is over the jitter tolerance, the link would have bit error. So you need reduce the link noise, such as power supply noise, transmission loss and reflection etc. which should be within d/s spec. request.

    best regards,

    Steven

  • 0 in reply to Steven(Shenzhen) Shi
    Expert 1895 points

    Hi Steven,

    About 954 Reg.

    RX_FREQ_HIGH(Address 0x4F) we read it is 66, the mean is 26MHz right?

    RX_FREQ_LOW(Address 0x50) we read it is 00 or FF, how to explain it?

  • 0 in reply to Vincent Hsieh
    TI__Guru** 103215 points

    Hello Vincent,

    0x4F is the integer portion of the frequency measurement in hex. So for 0x4F = 0x66, the integer portion is 102MHz 

    0x50 is the fractional portion in units of 1/256MHz, so for 0x50 = 0xFF, the fractional portion is 255/256 = 0.99

    So for the total detected frequency it would be 102.99MHz 

    Best Regards,

    Casey