AN3077 datasheet(27/82 Pages) STMICROELECTRONICS

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AN3077

Functional safety requirements for application software

Note:

Rationale: To verify if the read data compares with the written data

●

GPOIRB_SWTEST_CMP

This software test is used to execute the comparison between the desired output

values and the value read back via internal read back configuration. After writing the

output value, the test must read the status of the digital input.

Note:

Rationale: To verify if the read data compares with the written data

3.13.4.1.2

Implementation details

The SIUL hardware element shall be used for the safety function. Every pad that is not

dedicated to a single function can be configured as GPIO. Pads dedicated to ADC are an

exception to this rule, as they can be configured as inputs only.

The pads shall be configured via the appropriate pad configuration registers (PCRn) in the

SIUL module.

3.13.4.2

Double Write Digital Outputs

The SIUL is used to perform a Double Write Digital Output.

Mandatory: The SIUL must be configured to correctly define the configuration of the output

pads used. The software must perform a double write.

Note:

Rationale: To configure pads used by this safety function

Mandatory: To guarantee the integrity of the two output channels, the application shall test

the SIUL configuration implementing the SIUL_SWTEST_REGCRC.

Note:

Rationale: To avoid a CCF caused by incorrect configuration of the pads

Mandatory: The application must implement the double output write as defined by the

GPODW_SWAPP_WRITE.

Note:

Rationale: To write a digital output by exploiting redundancy

Table 6. Software BIST and/or test

Software BIST or test

Frequency

SIUL_SWTEST_REGCRC

Once after programming

GPOERB_SWTEST_CMP

Once every write

GPOIRB_SWTEST_CMP

Once every write

AN3077 Datasheet(PDF) 27 Page - STMicroelectronics

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