AN3077 datasheet(13/82 Pages) STMICROELECTRONICS

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AN3077

Functional safety requirements for application software

3.1.2

Recommended software requirements

The following sections contain Recommended design constraints for using the

Device_Number devices in an ASIL D system:

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Section 3.6: SRAM

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Section 3.12: Communication peripherals

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Section 3.13: I/O peripherals

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Section 3.16: Temperature sensors

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Section 3.18: Redundancy Control Checking Unit (RCCU)

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Section 3.19: Cyclic Redundancy Checker Unit (CRC)

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Section 3.24: Memory Protection Unit (MPU)

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Section 3.25: Register Protection Module

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Section 3.26: Error Correction Status Module (ECSM)

3.1.3

Implementation details

The following sections contain implementation details for using the Device_Number devices

in an ASIL D system:

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Section 3.2: System Status and Configuration Module (SSCM)

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Section 3.5: Clock configuration

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Section 3.7: Flash memory

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Section 3.8: Interrupt Controller (INTC)

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Section 3.10: Enhanced Direct Memory Access (eDMA) requests

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Section 3.13: I/O peripherals

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Section 3.14: Cross Triggering Unit (CTU)

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Section 3.16: Temperature sensors

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Section 3.17: Software Watchdog Timer (SWT)

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Section 3.19: Cyclic Redundancy Checker Unit (CRC)

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Section 3.20: Clock Monitor Unit (CMU)

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Section 3.21: Frequency-Modulated Phase-Locked Loop (FMPLL)

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Section 3.23: Power Management Unit (PMU)

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Section 3.25: Register Protection Module

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Section 3.27: Fault Collection and Control Unit (FCCU)

Note:

A section may contain Mandatory constraints, Recommended constraints,

Implementation hints or any combination of the three.

3.2

System Status and Configuration Module (SSCM)

3.2.1

Configuration

Mandatory: Before executing the safety functions, the SSCM shall be configured to inhibit

unintentional execution of the BAM code.

Note:

Rationale: Since BAM code is not intended to be executed by ASIL D applications, any

execution of the BAM, or part of it, must be inhibited.

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