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TCAN4551-Q1: RX buffer behaviour

Dennis Cerven
Prodigy 10 points
Part Number: TCAN4551-Q1
Other Parts Discussed in Thread: TCAN4550

Hello TI Forum,

I would like to check with you on following statements in the data sheets:

  • in the TCAN45xx software user’s guide stands: in a case, that the RX buffer is filled, the “original” data will be discarded => which I understand as the old data in the buffer is lost, new data is stored in the RX buffer
  • in the M_CAN Specification from BOSCH (Rev 3.3.0)(assumed, it is applicable on the TCAN4551) stands: As long as the respective NDAT (New Data Flag) is set, the RX buffer is locked against updates.

Please see the attached screenshots beneath.

Could you please check on this discrepancy?

Thank you!

  • 0
    TI__Guru 72647 points

    Dennis,

    Our applications team has been notified of this thread and will respond accordingly. Thank you for your patience.

    Regards,

  • 0 in reply to Eric Hackett
    TI__Mastermind 28250 points

    Hi Dennis,

    Thank you for bringing this to our attention.  I would follow the M_CAN Specification for the RX Buffer behavior because no modifications were made when it was implemented into the TCAN4550 that would cause a difference. 

    I will verify and get the Software User's Guide document updated with the correct description in the near future.

    Regards,

    Jonathan