SPRUJ28E November 2021 – September 2024 AM68 , AM68A , TDA4AL-Q1 , TDA4VE-Q1 , TDA4VL-Q1
In lockstep mode, CPU1 is used as a diagnostic for CPU0. In this mode, only the interrupt inputs for CPU0 are used. Besides to CPU0, these interrupt inputs are also internally routed to CPU1 (through the level-sync / edge-detect logic dedicated to CPU1, and additionally through some delay circuits). The outputs from both VIM interrupt cores are then sent to the R5FSS CCMR5 module through dedicated compare buses (with CPU0's outputs delayed). The CCMR5 module is responsible for comparing the two sets of output signals and for reporting any mismatches by generating a VIM bus compare interrupt.
In lockstep mode, only the VIM RAM dedicated to CPU0 is used, so software must not do anything with the ECC interface on the VIM RAM dedicated to CPU1.