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Original question:

DS125DF410: Eye diagram data concatenation and EOM centering

DS125DF410: Purpose of the MCU on the DS125DF410 EVM board

child sun
Prodigy 180 points
Part Number: DS125DF410
Other Parts Discussed in Thread: USB2ANY

Could you let us know the purpose and the detailed operations of the MCU (AT90USB1286t) on the evaluation board?

Do you have the code for the MCU?

Thanks.

  • 0
    TI__Mastermind 20782 points

    Hi Child,

    In the past, we had used the MCU for configuring the retimer.  We have now shifted to using a USB2ANY device to interface the GUI with the DS125DF410.

    Thanks,
    Drew

  • 0 in reply to Drew Miller1
    Prodigy 180 points

    Drew,

    Any more details that you can release? The MCU seems to be doing something in the background. For example, all the Lock/Sig Det LEDs are controlled by the MCU based on the schematics. Is the MCU "secretly" and autonomously communicating with DS125DF410 during normal operation? How can we stop it from doing anything in the background? We don't want it to affect the I2C communication between our external CPU board and the DS125DF410 chip.

    Thanks.

    Child

  • 0 in reply to child sun
    TI__Mastermind 20782 points

    Hi Child,

    I think the MCU may do some additional polling in order to control the LEDs.  I think there are a couple things you could look at if you're concerned about the I2C communication.

    1) Use a logic analyzer to monitor the I2C lines in order to determine specifically what impact the MCU may have.

    2) Remove the 0 Ohm resistors connecting the MCU to the SDA/SCL lines in order to ensure that it does not interfere.  If there is additional concern about the impact that the MCU has on other pins, consider removing the MCU.

    Thanks,
    Drew