AN3077 datasheet(33/82 Pages) STMICROELECTRONICS

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AN3077

Functional safety requirements for application software

3.13.5.2.1

Software test implementation

●

SIUL_SWTEST_REGCRC

The SIUL configuration registers are read and a CRC checksum is computed. The

checksum is compared to the expected value.

●

ETIMER0_SWTEST_REGCRC

The eTimer_0 configuration registers are read and a CRC checksum is computed. The

checksum is compared to the expected value.

●

ETIMER1_SWTEST_REGCRC

The eTimer_1 configuration registers are read and a CRC checksum is computed. The

checksum is compared to the expected value.

●

FLEXPWM0_SWTEST_REGCRC

The FlexPWM_0 configuration registers are read and a CRC checksum is computed.

The checksum is compared to the expected value.

●

FLEXPWM1_SWTEST_REGCRC

The FlexPWM_1 configuration registers are read and a CRC checksum is computed.

The checksum is compared to the expected value.

Note:

Implementation hint: The eDMA and CRC modules should be used to implement this SIF

to avoid overloading the CPU.

●

PWMRB_SWTEST_CMP

This procedure output compares the PWM read back provided by a single channel of

the eTimer_0 (eTimer_1) with the expected values that have been written to the

FlexPWM_1 (FlexPWM_0) output channel.

3.13.5.2.2

Implementation details

The following hardware elements shall be used for the safety function:

●

eTimer_0 channels

●

eTimer_1 channels

●

FlexPWM_0 channels

●

FlexPWM_1 channels

Mandatory: The pads shall be configured via the appropriate pad configuration registers

(PCRn) in the SIUL module.

Note:

Rationale: To configure pads used by this safety function

Table 9. Software BIST and/or test

Software BIST or test

Frequency

SIUL_SWTEST_REGCRC

Once after programming

ETIMER0_SWTEST_REGCRC(1)

This software BIST is needed only if the eTimer channels are used for the safety function.

Once after programming

ETIMER1_SWTEST_REGCRC(1)

Once after programming

FLEXPWM0_SWTEST_REGCRC(2)

This software BIST is needed only if the FlexPWM channels are used for the safety function.

Once after programming

FLEXPWM1_SWTEST_REGCRC(2)

Once after programming

PWMRB_SWTEST_CMP

Once every write

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