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DS90UB948-Q1: Questions related to the MAP test.

Alan Xia
Genius 9640 points
Part Number: DS90UB948-Q1
Other Parts Discussed in Thread: ALP

Hi team，

The customer uses 948 for MAP test and has several questions, please help to answer them.

1、

What is the basis for determining OK in the above figure?

2、 How to choose EQ if the test result is all green? Are there other reference tests we can implement?

3、When testing MAP, is there any requirement for the length of the IIC harness drawn from the deserialization? If we test the state of high and low temperature, we need to lead the IIC and GND out of the incubator.

  • 0
    TI__Intellectual 2755 points

    Hi Alan,

    1) That minimum recommendation was intended to allow enough margin for our Adaptive EQ to settle on the link. As shown in the diagram, at least three consecutive EQ levels must have 4 continuous green bars and two of those levels must create a 2x4 rectangle.

    2) If the entire test result is green, then that means the Link is very strong and does not have any measurable errors. It is not recommended that specific EQs are chosen, but rather that the Adaptive EQ is allowed to run and settle on its own.

    3) We do not have any guidance on the length of I2C wires coming from the deserializer. You would have to check the state of the signal at various lengths to see how long the wire can be.

    Let me know if you have any other questions.

    Best,

    Cameron Carlson

  • 0 in reply to Cameron Hoholik-Carlson
    TI__Genius 9640 points

    Hi Cameron，

    The client has a few further questions. Please continue to help answer:

    1. What does the SP in the MAP test refer to? Can we adjust it ourselves?

    2. Can the judgment standard of EOM be quantified based on the test results of your company's customers?

    3. The MAP test will be interrupted, and the IIC connection is normal. After restarting the software and testing again, it will still be interrupted in about 2 minutes. Is it a software bug?

  • 0 in reply to Alan Xia
    TI__Intellectual 2755 points

    Hi Alan,

    1) SP stands for Strobe Position. This essentially represents the position in the eye that is getting sampled. This is something that can be adjusted. Increasing the "clock delay" will result in an earlier strobe position, while increasing the "data delay" will result in a later strobe position.

    2) Can you clarify what you mean? I'm a little confused on what you are asking. In addition to this, when you said EOM, did you mean MAP? EOM is not something that is supported on our FPD-Link III devices.

    3) Can you give me more details about your setup and provide outputs of the test? I would also verify that you are connected to ALP on the DES side rather than the SER, as you must be plugged into the DES in order for the MAP test to work correctly.

    Best,

    Cameron Carlson