An FMEDA provides the base FIT rate of the device. It also provides the means to determine the residual FIT rate when the relevant diagnostic mechanisms are selected in the FMEDA by the system integrator.
A safety manual describes, in detail, how to use the device from both a hardware and software perspective in a safety-critical application that must conform to the ISO 26262 safety standard.
Refer to ISO 26262 Automotive Functional Safety - PIC16, PIC18 and AVR for more information about the functional safety packages.