AN3077 datasheet(18/82 Pages) STMICROELECTRONICS

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Functional safety requirements for application software

AN3077

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configuration is correct.

Frequency: Once per FTTI

Note:

Rationale: To verify that the PIT remains at its expected configuration

3.12

Communication peripherals

The Device_Number includes the following communication peripherals:

●

FlexCAN

●

DSPI

●

FlexRay

●

LINFlexD

Recommended: An appropriate safety software protocol should be utilized (for example,

Fault Tolerant Communication Layer, FTCOM) for any communication peripheral employed

to meet ASIL D application requirements.

3.13

I/O peripherals

The following sections cover the use of the following peripherals:

●

System Integration Unit Lite (SIUL)

●

eTimer

●

FlexPWM

These modules shall be used to implement the following functions if they are part of the

application safety function:

●

Read Inputs

–

Read Digital Inputs

–

Read PWM Inputs

–

Read Encoder Inputs

●

Write Outputs

–

Write Digital Outputs

–

Write PWM Outputs

These are the safety functions assumed during analysis of the Device_Number.

3.13.1

Read Digital Inputs

For ASIL D applications, digital inputs used for safety purposes are assumed to be acquired

redundantly as described in the following section.

Note:

Implementation hint: If sufficient diagnostic coverage can be obtained by a plausibility

check on a single acquisition for a specific application, a plausibility check can replace a

redundant acquisition. This hint is a special case of deviating from mandatory requirements

as described in the Preface.

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