Customer needs some clarification on the content of the Clock_FMEDA_KNOX_Customer.
In the Column Safety mechanism preventing violation of safety goal, for failures "Stuck at", the following note is given:
[SM_1021] having a controlled diagnostic coverage of 0.0% and having a detected diagnostic coverage of 0.0%
Validate Clock using LIN communication within fault tolerant time interval
Questions: Why diagnostic coverage is 0%?
This failure can not be detected by using internal watchdog COP?
Hello Adrian
I checked the FMEDA, and found that number is a function of [OSCE, PLLSEL] and CMPUCLKS[COPOSCSEL]. In the current configuration, the value of these are [OSCE, PLLSEL] = 1 and CMPUCLKS[COPOSCSEL] = 0. In this mode, FIRC is the source of system PLL as well as the reference clock of WDOG. Hence, there is no coverage on FIRC (common-cause), or the External Oscillator. Hence, the statement about 0% Diagnostic Coverage.
If you re-configure the FMEDA to change these values based on actual customer application you will see the numbers updated accordingly.
Hope this helps,
Regards
-Aarul Jain