SM CODE SAI_SM_1
Fault detection time Depends on implementation
Addressed fault model Permanent/transient
Dependency on Device configuration None
Initialization Depends on implementation
Periodicity Continuous/ On demand
Test for the diagnostic Not applicable
Multiple-fault protection CPU_SM_0: Periodic core self-test software
Recommendations and known limitations
Efficiency versus transient failures is linked to final application characteristics. We define as
Tm the minimum duration of serial audio wrong signal permanence required to violate the
related safety function(s). Efficiency is maximized when execution test frequency is higher
than 1/Tm.
Method to be used when SAI interface safety-related use is audio stream generation.
Table 134. SAI_SM_2
SM CODE SAI_SM_2
Description 1oo2 scheme for SAI module
Ownership End user
Detailed implementation
This safety mechanism is implemented using the two SAI interfaces to decode/receive the
same input stream audio. Application software checks the coherence between the received
data.
Error reporting Depends on implementation
Fault detection time Depends on implementation
Addressed fault model Permanent/transient
Dependency on Device configuration None
Initialization Depends on implementation
Periodicity On demand
Test for the diagnostic Not applicable
Multiple-fault protection CPU_SM_0: Periodic core self-test software
Recommendations and known limitations
The MCU performance overload and the implementation complexity associated to this method
can be relevant.
Method to be used when SAI interface safety-related use is audio stream receive.
3.6.38 Single Wire Protocol Master Interface (SWPMI)
Table 135. SWPMI_SM_0
SM CODE SWPMI_SM_0
Description Periodic read-back of configuration registers
Ownership End user
Detailed implementation
This method must be applied to SWPMI configuration registers.
Detailed information on the implementation of this method can be found in
Section 3.6.14 Extended interrupt and events controller (EXTI).
Error reporting Refer to NVIC_SM_0
Fault detection time Refer to NVIC_SM_0
UM2305
Hardware and software diagnostics
UM2305 - Rev 10
page 75/110
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