SPRUJ28E November 2021 – September 2024 AM68 , AM68A , TDA4AL-Q1 , TDA4VE-Q1 , TDA4VL-Q1
The Error Signaling Module (ESM) centralizes fault reports. It provides mechanisms to classify errors by severity and to provide programmable error response. The error classification in the ESM is determined by programmed configuration for each individual error input. For each individual error input the configuration can be set to assert an output error pin, or generate an interrupt to a CPU, or both. When an individual error input is configured to generate an interrupt, the configuration will also select whether the interrupt that is generated will be one of high priority or low priority.
By reporting the faults in a central location, the system may determine what caused the fault and what action can be taken. In general, the faults can be split into two categories:
The ESM reports errors in two ways:
Both mechanisms can be used at the same time for the same fault, signaling both an interrupt and the external ERROR pin. This allows the device to attempt to recover, but if it fails, then the external system is still alerted. If it succeeds, then it can remove the ERROR pin assertion so that the external system knows that a potentially unsafe condition was avoided.
Lastly, the ESM does not specify any methods of intervention, only the process of alerting internal CPUs and external monitor(s) of an existing error event.
Figure 12-495 shows the ESM module block diagram. Note that not all instances may be pinned out in the device. For more information, see ESM Environment.