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TL16C750: Problem that transmission data is increased by 1 byte

F.N
Expert 8760 points
Part Number: TL16C750
Other Parts Discussed in Thread: TL16C2752, TL16C754C, TL16C752C

Hi team,

My customer reports TL16C750 has a problem that transmission data is increased by 1 byte.
The customer wants to know the cause and the work aroud.

Does TL16C750 have the same Error[Short STOP Bit Error(*1)] as TL16C752C/TL16C754C/TL16C2752?
If TL16C750 has this, does this error cause 1 byte data increase?
Please let me know.

 *1 : www.ti.com/.../sllz058

Best regards,
Fumio Nakano

  • 0
    TI__Guru 62910 points
    Hello Nakano-san,

    To my knowledge, the stop bit errata you mentioned only applies to TL16C752C, TL16C754C, and TL16C2752, not to TL16C750. When the transmission data is increased by one byte, do you mean that after all the data that was written to the TX FIFO has been transmitted an additional byte is then transmitted? If so, what kind of data is in this byte (e.g., is it a repeat of the previous byte, is it all zeros, is it random data, etc.)? Do you see indication that THR is empty prior to transmission of this byte?

    Regards,
    Max
  • 0 in reply to Miguel Robertson
    TI__Expert 8760 points

    Hello Max-san,

    Thank you for your prompt reply.
    I will ask the customer about your question.
    After I get the answer, I will come back.

    Best regards,
    Fumio Nakano

  • 0 in reply to F.N
    TI__Guru 62910 points
    Hello Nakano-san,

    Did you get any more information from the customer regarding this issue?

    Max
  • 0 in reply to Miguel Robertson
    TI__Expert 8760 points

    Hello Max-san,

    I am sorry for the reply being delayed.

    I have asked the below questions. But the customer  seems to be struggling to evaluate,
    so I have not got a clear answer yet. The only information obtained is that the additional byte
    is the same as the data 16 bytes before and the content of the data is unknown.
    I am asking the customer how they could verify the same despite the unknown contents of the data.


    (1)When the transmission data is increased by one byte, do you mean that after all the data that
       was written to the TX FIFO has been transmitted an additional byte is then transmitted?

    (2)If so, what kind of data is in this byte (e.g., is it a repeat of the previous byte,
       is it all zeros, is it random data, etc.)?

    (3)Do you see indication that THR is empty prior to transmission of this byte?

    Best regards,
    Fumio Nakano

  • 0 in reply to F.N
    TI__Guru 62910 points
    Nakano-san,

    Thanks for the update. We will wait for the additional clarifications from the customer. I will be out of office for most of this week, but one of my colleagues can monitor this thread for updates.

    Regards,
    Max
  • 0 in reply to Miguel Robertson
    TI__Expert 8760 points

    Max-san,

    I appreciate your cooperation.
    When I receive the additional clarifications from the customer,
    I will update soon.

    Best regards,
    Fumio Nakano

  • 0 in reply to F.N
    TI__Expert 8760 points
    Max-san,

    I appreciate your cooperation.

    I have not received the reply from the customer yet.
    I close this thread and will post as a new inquiry when I recieve the reply from the customer.
    Because I think the answer to my first question is answered from you and the reply of the customer is too late.

    Thank you.

    Best regards,
    Fumio Nakano