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TMS570LS3137: CCM-R4F self-test

Chuck Wong
Genius 3950 points
Part Number: TMS570LS3137


Hello there,

We enable ESM Group1 Channel 31 "CCM-R4F - self-test" error to have influence on the nERROR ESM output signal, therefore if the requested CCM-R4F self-test failed, the nERROR signal will be asserted to reset the MCU (hard-wired by hardware).

However, at TRM SPNU449C para. 9.3.2, it is saying that: 

  1. During self-test, the compare error module output signal is deactivated. Any fault detected inside the CCM-R4F will be flagged by ESM error “CCM-R4F - self-test”.
  2. During the self-test operation, the compare error signal output to the ESM is inactive irrespective of the compare result.

Does this mean that the nERROR pin will never to activated by ESM Group1 Channel 31 "CCM-R4F - self-test" error?

Thank you!

  • 0
    TI__Guru**** 198766 points

    Hi,

    If the ERROR pin action/response on Group 1.31 is enabled, the nERROR pin will be pulled LOW  when CCM-R4F selftest is done.

  • 0 in reply to QJ Wang
    TI__Guru**** 198766 points

    During self-test, both CPUs can execute normally, but the compare logic will not be checking any CPU signals, it checks the test patterns (match and mismatch), and generates "CCM-R4F - self-test" error if any fault detected.

  • 0 in reply to QJ Wang
    Genius 3950 points

    OK QJ,

    The quoted texts say "during self-test", OK, so only "during self-test" that it will deactivate the nERROR signal output. If any fault is detected, the CCM-R4F - self-test ESM error will be generated, so if it has been configured to assert nERROR, this output signal will be pulled low. 

    Is my understanding correct?

    Thanks.

  • +1 in reply to Chuck Wong
    TI__Guru**** 198766 points
    Chuck Wong said:
    If any fault is detected, the CCM-R4F - self-test ESM error will be generated, so if it has been configured to assert nERROR, this output signal will be pulled low. 

    You are correct. The nERROR will be asserted if any error occurs during the self-test. The nERROR pin will keep low until you clear it manually.