AN4266 datasheet(13/76 Pages) STMICROELECTRONICS

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AN4266

Functional safety requirements for application software

Doc ID 024283 Rev 2

13/76

3.1.2

Recommended software requirements

The following sections contain Recommended design constraints for using the

SPC56xL70xx 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 SPC56xL70xx 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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