The status_uncorrectable and status_essential signals are flags used to
indicate whether the error detected is correctable and/or
essential. If the Classification feature is disabled, the status_essential signal asserts and stays
asserted after the first error is detected and corrected. These
signals are only valid in mitigation modes and are set when the
controller is in the correction or classification states,
respectively. In Detect modes, both these flags are asserted after
an error is detected.