Details:

Granular error status not logged correctly for detected faults in COMP_CHECK and COMP_ERR fields of MSS_CRTL:*_BUS_SAFETY_ERR registers.

The error signal err_comp and err_comp_signals are used to detect any faults on the diagnostic circuit. The AND'ed output of these two signals are used to report the fault. However they are sampled at different edges of the clocks resulting in loss of the error signal getting generated. and hence is not getting logged in the MSS_CTRL MMRs.

There are two possible scenario:

Case 1: Log registers have non-zero values

Here the granular logs are captured correctly and appropriate action can be taken for a given fault.

Case 2: Log Registers have all zeros

Here the granular logs are not captured correctly and possible entities affected are R5F and L2 memory.

Figure 2-1

Workaround(s):

No Workaround.

As Granular Error Status is not logged, the bus safety fault is detected only as an aggregated error event and the Granularity of diagnostics information will not be captured correctly.

Case 1: In the case where the logs are captured correctly the log results can be used to take appropriate action.

Case 2: In the case where the logs are not captured correctly then for a) diagnostics no action needed and b) in case of actual failure in the application WarmResetn should be used.