ST STM32L4 Series, User Manual

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SM CODE QSPI_SM_1
Addressed fault model Permanent/transient
Dependency on Device configuration None
Initialization Depends on implementation
Periodicity Continuous
Test for the diagnostic
Direct test procedure for CRC efficiency is not available. CRC run-time hardware failures
leading to disabling such protection fall into multiple-fault scenario, from IEC61508
perspective. Related failures are adequately mitigated by the combination of safety
mechanisms reported in this table, field
Multiple-fault protection .
Multiple-fault protection QSPI_SM_2: Information redundancy techniques on messages
Recommendations and known limitations Enabling related interrupt generation on the detection of errors is highly recommended.
Table 71. QSPI_SM_2
SM CODE QSPI_SM_2
Description Information redundancy techniques on messages
Ownership End user
Detailed implementation
This method is implemented adding to data packets (not commands) transferred by OCTOSPI
interface a redundancy check (like a CRC check, or similar one) with encoding capability. The
checksum encoding capability must be robust enough to guarantee at least 90% probability of
detection for a single bit flip in the data packet.
Consistency of data packet must be checked by Application software before consuming 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
To give an example on checksum encoding capability, using just a bit-by-bit addition is
unappropriated.
This safety mechanism can overlap with information redundancy techniques implemented at
system level to address failure of physical device connected to OCTOSPI port.
3.6.18 Analog-to-digital converter (ADC)
Table 72. ADC_SM_0
SM CODE ADC_SM_0
Description Periodic read-back of configuration registers
Ownership End user
Detailed implementation
This method must be applied to ADC 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
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