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TDA4VM: Safety mechanism implementation about MMA component

Zhihua Ding
Intellectual 460 points

Part Number: TDA4VM

Hi,

I have on idea about how to implement below safety mechanism from safety manual, I can't find any description from TRM. Could you please give some suggestion?

Thank you!

Best Regards

Ding Zhihua

  • 0
    Intellectual 460 points

    Hi, 

    Any suggestion? Thanks!

    Zhihua

  • 0 in reply to Zhihua Ding
    TI__Expert 4005 points

    Zhihua, 

    MMA1 - MMA7 are all hardware mechanisms so there is no software overhead required, the MMA module produces an externally-visible error if they occur. 

    MMAT1- MMAT8 are tests in place to prevent latent faults, as a system integrator you would implement these tests to ensure that the diagnostics are working.  For example to test that MMA7 (under/overflow), before you application starts or periodically you can force a buffer overflow/underflow scenario and ensure that an error is flagged. 

  • 0 in reply to Y. Yang
    Intellectual 460 points

    Hi Yang,

    Thanks for the feedback.  What's the "externally-visible error",  how we can detect the error happens? If no software overhead required, what's the system behaviour after this fault?

    I think the main problem is that I don't have any reference document in hand, I can't find any description about MMA in the TRM except some simple words.

    So if you know where to get the referce document, maybe I can first go through it and understand the MMA. Otherwise it is a little bit comprehand to discuss how to implement these safety mechanism one by one.

    Thank you!

    Zhihua