The definition of STC Test Coverage

Hi,

In page 338 (8.3) of TRM (spnu499), "Table 8-1. STC Test Coverage and Duration" is described.
What STC Test Coverage mean?
I want to know the numerator and the denominator for the coverage.

Also, could you teach me the detected faults by STC Test?
For example, in case of March13N, Address decoder faults, Stuck-At faults, Coupled faults and so on are detected, which is described in p.318 ("7.4 Memory Test Algorithms on the On-chip ROM").
I need the same information for LBIST.

Thanks

Nomoto