Starting to Safety Project

Hi Eren,

  Those are the various safety diagnostic functions the HalCoGen will generate if you click the corresponding checkboxes. Once the HalCoGen creates the project, all the checkbox safety diagnostics will be called in the sys_startup.c file. These safety functions are located in the sys_selftest.c file. Whether you must use them is a very application dependent question.  You safety goal and safety case will determine what level of diagnostics you need.  I recommend that you reference the corresponding safety manual for your device.  Below is one example safety manual.

Hi charles

I 've read this safety manuel for tms570ls04x. There are tons of diagnostic functions for this mcu right?
But i still don't understand what functions that i should use? All i know that i should achieve the SIL 3 certificate for some project.
Is there a any guidance or example like, you should do this or you shouldn't do that for your mcu safety goal? I am asking that because safety manuel is just explanation of what the functions are doing ? what the esm module response is ,etc. Why all the safety functions are not same for the all safety projects? why it would be depend on application. Shouldn't we worried about mcu's all functions? At this point i need really good examples.

for second , i am looking for the Hercules SafeTI™ Diagnostic Library. Why there are 2 different diagnostic library ( halcogen and safeti_diag_lib) ?
which diagnostic library should i use and what are the differences between each other?

Hi Eren,

  What you need to do is use the FMEDA and Safety Analysis report to evaluate what diagnostics you should apply to achieve your desired safety goal per your safety case. SIL3 requires less than 100 FIT (100 failures in 10E9 hours) and 99% SFF (safe failure fraction) in your overall system. The MCU is just one portion of your overall system. You will need to budget the number of FIT you can tolerate for the MCU. With the FMEDA tool, you can find out the FIT rates and SFF after you apply the diagnostics per your safety case. You don't need to apply all diagnostics listed in the safety manual to achieve your budgeted FIT rates and SFF for the MCU. 

  To obtain the safety analysis report and the FMEDA you will need to sign the NDA agreement. Please use the below link to submit your request.

well thank you for your help Charles
I'll handle this NDA prosedure and get that analysis
But i didn't get the answer about the differences between halcogen safety library and safetyTI diagnostic library.

Eren

Hi Eren,
The HalCoGen safety functions were developed earlier than the SafeTI libray. For legacy reason it is still kept. I hope the below wiki page will clarify your questions.
processors.wiki.ti.com/.../Integration_of_HALCoGen_with_Hercules_SafeTI_Diagnostics_Library

Hi Eren,
If your question is answered can you please close the thread by clicking the 'Verify Answer' button? Thanks.