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DS90UB948-Q1: DS90UB948：FPDLinkⅢ Signal Quality Assessment Method

?? ??
Prodigy 140 points
Part Number: DS90UB948-Q1

Tool/software:

Hi,

We are using DES: DS90UB948 and SER: DS90UB927 for communication via FPDLink III.

We would like to establish a signal quality assessment method for FPDLink III within our company, so could you please let us know the items that should be evaluated?

We understand that BER is important, so we are evaluating MAP.

If there are any other items that need to be assessed, please let us know.

The PCLK is 58.7 MHz, and the harness length is approximately 3-5 meters.

Best,

  • 0
    TI__Mastermind 37080 points

    Hi There,

    The first thing to establish a good signal integrity is to ensure meeting our channel specs. Chosen the right components are very important for the high speed performance. Here are some suggestions.

    1. Pick the right connector and cable for your application and 3 - 5 meters shouldn't be a problem.
    2. If you are configuring STP mode, you might need to have a CMC and AC coupling caps.
    3. The number PCB layer and PCB material.
    4. Use the high speed best practice for your PCB design.

    Let me know if this helps. If you have further questions, let me know.

    Aaron

  • 0 in reply to Aaron Heng
    Prodigy 140 points

    Hi,

    Thank you for your response.
    I understand that the points you mentioned are confirmation items from the PCB design stage.
    Regarding "the number of PCB layers and PCB material," is the appropriate number of PCB layers specified in the datasheet for the serializer/deserializer?

    In my work, the devices on both the serializer and deserializer sides are completed, and there are cases where the harness varies by model.

    Assuming the devices are not an issue, would MAP measurement be sufficient to confirm the quality of the harness?

    Should I also conduct a mask evaluation of the eye pattern?

  • 0 in reply to ?? ??
    TI__Mastermind 37080 points

    We don't dictate how customer should be constructed for their stack up; therefore, there is no any requirements in the datasheet how the PCB should be. MAP is a tool allowing customer to evaluate eye opening from incoming signal, but it is not meant to use in determining the cable harness. You might want to contact the cable vendors where you can get the data in order to determine the channel specs. It is up to you if you want to evaluate the eye opening. It doesn't represent the characteristic of the channel specs.

    Aaron