A number of assumptions must be made in order to
calculate the safety metrics according to ISO 26262:2018. The assumptions of use for
the reference are detailed below:
- Confidence level applied to
permanent FIT rates:
- Confidence level applied to
transient FIT rates:
- Neutron flux: set to 1
(equivalent to exposure at sea level, as measured in New York City)
- Thermal management (Theta-Ja):
- Use case power:
- Safe vs non-safe: All permanent
faults are considered 0% safe by default. Transient faults of digital SRAM,
digital logic, and flash are considered 50% by default.
- Operational (mission) profile
used:
- Special considerations on pin
level tailoring:
- Special considerations on
function and diag tailoring:
- Special considerations on the
application of diagnostics: