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Original question:

AM2634: What is the Value for (Polynomial, Initial value, Final XOR, Inverted Input, Inverted Output) in CRC32

DRA829J: MCRC: supported polynomials

Dmitry Tuykov
Expert 1281 points

Part Number: DRA829J
Other Parts Discussed in Thread: DRA829,

Tool/software:

Hi TI-Team,

in the new DRA829 TRM rev. D there is a change in the MCRC chapter, seems than more polynomials are supported now (previously it was CRC64-ISO only).

On the other hand I do not see any difference in the TRM supplement with registers definition - none of the registers describes the  selection of used polynomial.

Therefore I have the following questions:

  1. Does MCRC IP in DRA829J support CRC32 polynomial?
  2. If answer to the question 1 is yes, which registers control it?
    Same which mentioned here: https://e2e.ti.com/support/microcontrollers/arm-based-microcontrollers-group/arm-based-microcontrollers/f/arm-based-microcontrollers-forum/1420090/am2634-what-is-the-value-for-polynomial-initial-value-final-xor-inverted-input-inverted-output-in-crc32/5441831?tisearch=e2e-sitesearch&keymatch=MCRC%20polynomial#5441831 ?
  3. If answer to the question 1 is yes, can we assume the TRM will be updated to provide precise registers definition?

Thanks,
Dmitry

  • 0
    TI__Guru*** 132791 points

    Hi Dmitry,

    I believe that the TRM should still read as a CRC64-ISO only, else as you mention bitfields are required to change the polynomial setting.   

    Working with team to get an official response to you on this.

    Regards,

    kb

  • 0 in reply to KB
    Expert 1281 points

    Hi kb,

    looking forward to official response.

    If IP supports polynomials selection and registers definition is just missed in the TRM, it will be a good news for us.

    Thanks
    Dmitry

  • 0 in reply to Dmitry Tuykov
    TI__Guru*** 132791 points

    Hi Dmitry,

    Current investigation is pointing to a documentation filter, leading incorrect polynomials being listed in the TDA4x TRMs.   Still awaiting official confirmation on this.

    In meantime recommend proceeding on any ongoing development, with understanding that only a single polynomial is supported, as was present in earlier revisions of the DRA829 TRM.

    Thank you for your patience, will update thread with final finding.

    Regards,

    kb

  • 0 in reply to KB
    Expert 1281 points

    Hi kb,

    could you share any news regarding the topic?

    Thanks,
    Dmitry

  • +1 in reply to Dmitry Tuykov
    TI__Guru*** 132791 points

    Apologies Dmitry, I had seen an offline thread which you were on and had thought this issue was closed. 

    There is only a single polynomial supported by the MCRC block as per previous response, the TRM will be updated accordingly.   

    Regards,

    kb

  • 0 in reply to KB
    Expert 1281 points

    Hi kb,

    offline discussion was mainly about 64bit polynomial and why it's not OK for us.

    So I still had some little hope that others can be supported.

    Thank you for the final statement. Thread can be closed.

    Regards,
    Dmitry