SPRUJ28E November 2021 – September 2024 AM68 , AM68A , TDA4AL-Q1 , TDA4VE-Q1 , TDA4VL-Q1
The ESM can have up to 1024 error event inputs, configurable by groups of 32. For the mapping of system interrupt error events to ESM interrupt inputs, see Interrupt Sources.
Level error events (active high) are synchronized to the ESM clock. This synchronized value is captured in to a flop.
Pulse error events use rising edge detection. Each pulse error event has 3 redundant inputs. Each input has its own edge detection logic. Multiple transmission protects against Single Event Upsets (SEUs, transient errors) causing a pulse to be lost during transmission and against failure of the edge detection logic. Once an edge has been detected on any of the three inputs, the ESM_RAW_j status is set. Subsequent pulses are likely to come concurrently or quickly enough that software will not have reacted yet. This logic is intentionally biased against false negatives and towards false positives. An SEU that causes an event where none actually occurred will cause software to be called in to action. Software must observe that there is no real error and clear the false status.