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[FAQ] LMH0397: HD PLL Pathological Bit Error

Part Number: LMH0397

HD PLL Pathological causes bit error over an extended length of time

  • It's been observed that if we run this pattern over extended length of time - for example at least 4-5 hours - there may be bit error or a burst of errors.
    Further, this has been observed with certain SDI video pattern generator.

    Root cause of this issue has been identified to be related to the SDI rate detector residing at the front end of the equalizer.
    This low frequency video pattern from this video generator causes the device to mis-detect rate and then detect the rate correctly again. This going back and force between rate causes bit error.
    To prevent this occurrence. we can force rate detector to stay at HD/3G rate. This can be done by forcing the rate through - ConfigIO Reg 0x22 = 0x28 setting.