• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 31 subscribers
  • Views 296 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

Original question:

TMS570LC4357: Will a reset of nERROR be possible while there is fault condition signalled to the ESM?

TMS570LC4357: nERROR and LTC behaviour during a nERROR reset request?

Max Wittekind
Expert 1875 points
Part Number: TMS570LC4357


Hi QJ,

When discussing the nERROR behaviour we noticed that figure 16-8 in the Technical Reference describes a case, where the nERROR reset request is send before a failure has occurred and thus leading to nERROR beeing reset immediately after the LTC has expired.

This raises the question if the a reset of the LTC due to a new error beeing signaled, resets the EKEY in ESMEKR, while starting the LTC from 0 does not. The three differnet Cases displayed in the attached image show our understanding of the behaviour of the nERROR and the corresponding behaviour of EKEY in ESMEKR

(Q) Is our understanding of nERROR and EKEY (and the state machine) correct?

Thank you and best regards,
Max

  • +1
    TI__Guru**** 198766 points

    Hi Max,

    The relations among ESM failures, nERROR, EKY in your diagram are correct. But the explanation about LTC is not correct.

    The LTC is reset to the preload value (for example 0xFFFF) when error occurs, then decrements every VCLK cycle until LTC=0. LTC will be reset to preload value when next error occurs. LTC has nothing to do with EKY reset request.