SM CODE USB_SM_0
Error reporting Refer to NVIC_SM_0
Fault detection time Refer to NVIC_SM_0
Addressed fault model Refer to NVIC_SM_0
Dependency on Device configuration Refer to NVIC_SM_0
Initialization Refer to NVIC_SM_0
Periodicity Refer to NVIC_SM_0
Test for the diagnostic Refer to NVIC_SM_0
Multiple-fault protection Refer to NVIC_SM_0
Recommendations and known limitations Refer to NVIC_SM_0
Table 146. USB_SM_1
SM CODE USB_SM_1
Description Protocol error signals
Ownership ST
Detailed implementation
USB communication module embeds protocol error checks (like overrun, underrun, NRZI, bit
stuffing etc.) conceived to detect network-related abnormal conditions. These mechanisms
are able anyway to detect a marginal percentage of hardware random failures affecting the
module itself
Error reporting Error flag raise and optional interrupt event generation
Fault detection time
Depends on peripheral configuration (for example baud rate). Refer to functional
documentation
Addressed fault model Permanent/transient
Dependency on Device configuration None
Initialization Depends on implementation
Periodicity Continuous
Test for the diagnostic Not applicable
Multiple-fault protection USB_SM_2: Information redundancy techniques on messages
Recommendations and known limitations Enabling related interrupt generation on the detection of errors is highly recommended.
Table 147. USB_SM_2
SM CODE USB_SM_2
Description Information redundancy techniques on messages
Ownership End user or ST
Detailed implementation
The implementation of required information redundancy on messages, USB communication
module is fitted by hardware capability. It basically allows to activate the automatic insertion
(and check) of CRC checksums to packet data.
Error reporting Error flag raise and optional interrupt event generation
Fault detection time
Depends on peripheral configuration (for example baud rate). Refer to functional
documentation.
Addressed fault model Permanent/transient
Dependency on Device configuration None
Initialization Error reporting configuration, if interrupt events are planned
Periodicity Continuous
UM2305
Hardware and software diagnostics
UM2305 - Rev 10
page 81/110
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