SM_073 and SM_074 for S32k118

[Maverick92]

Hi all,

I am looking into functional safety implementation for S32k118

Based on the "S32K1xx Series Safety Manual" it is mandatory to enable CMU to monitor the integrity of the system clock signal (FIRC). (SM_083)

But the manual also says to implement SM_073 and SM_074 to verify the integrity of FIRC by utilize a method comparing counter values of two independent timers based on different.
clock sources.

Question: Is it required to implement both CMU as well as the compare method to verify FIRC or is CMU sufficient since that also performs the compare using SIRC clock as reference?

Please clarify, and thank you very much

[Yashwant_Singh]

Hello,

SM_073 and SM_074 should only be needed for K14x if FIRC used as safety clock . For S32K11x this requirement should be covered by CMU

Thanks!

-Yashwant