SPRUJ79 November 2024 F29H850TU
The LCM has the capability to force a fault to check the error signaling path between the LCM and ESM at the device level (for example, generate NMI, indicate error on ERRORSTS pin or trigger reset.) This test is executed separately from the self-test, and is executed on the primary and redundant comparators individually through separate calls.
Execution of this self-test is started by setting the appropriate bit: LCM_CONTROL.CMPx_ERR_FORCE, where x is the number designator of the redundant comparator to be tested.
Upon execution of this one-cycle-long test, the LCM asserts a lockstep comparison error signal to the device. The normal functional compare fail flag (LCM_STATUS.CMP_FAIL) is not set by this test mode.
The following bits are set by the test:
Because the test can trigger an NMI if configured in ESM on a test pass, the "DONE" flag allows the cause to be determined by either a functional fail or an error forcing test fail.