What is Freedom From Interference (FFI)?
Why?
What?
Cascading Failures:
Cascading Failures occur when the failure of one element within a system leads to the failure of another element, or even multiple elements, within the same system. These failures are interdependent but are not caused by a single common event or root cause. A failure in one part triggers a chain reaction, causing subsequent elements to fail, creating a cascading effect.
The figure below illustrates that failure in element 2 does not cause element 1 to fail, hence achieving Freedom From Interference between element 1 and element 2
The figure below illustrates that failure in element 3 does cause element 4 to fail, there is no Freedom From Interference between element 3 and element 4
How to Achieve FFI in Functional Safety Systems?
Partitioning in Hardware and Software: One of the most direct ways to achieve FFI is by partitioning critical and non-critical components. This partitioning can occur at both the hardware and software levels
Conclusion