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DS90UB948-Q1: DS90UB948：How to determine if a map is locked

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Prodigy 140 points
Part Number: DS90UB948-Q1

Tool/software:

Hi,

We are communicating using FPDLink III with the DS90UB948 and DS90UB927. The datasheet states that the MAP determines LOCK (= error) using 3 bits for DAC, CLOCK1, and CLOCK2.
1) Is the image in the attached diagram correct?
If it is correct, then the MAP cannot ensure sufficient quality, so we will also conduct eye pattern and BER tests.

2) Where are the bits for DAC, CLOCK1, and CLOCK2 located within the 35 bits? Is there data available for the bit allocation?

Best,

  • 0
    TI__Expert 3520 points

    Hi,

    We cannot share the location of the bits in our FPD-Link III frame publicly.

    The MAP is a useful feature to determine channel margin and best device channel settings. Running MAP over multiple iterations would help to ensure robustness in signal integrity

    Performing eye measurements will also be a good tool to better characterize your system.

    Thanks,

    Ragav Subramanian