Fujitsu FR60 Hardware Manual page 73

CHAPTER 3 CPU AND CONTROL UNITS
[bit0] ETLK (Entry lock)
Locks into the cache all the entries in the block corresponding to the tag. The entries are
locked if ETLK=1 (there is no updating) if a cache miss occurs. However, invalid sub blocks
are updated. If, for both Ways 1 and 2, a cache miss occurs while the entries are locked, one
cycle required for the cache miss decision is lost and then external memory is accessed.
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