Fujitsu FR60 Hardware Manual page 239

In this case, the external bus is accessed again, but no prefetch access is performed before a new read
access occurs.
■ Restrictions on Prefetch-enabled Areas
If prefetch to a little endian area is enabled, be sure to access the area using word access. If data read into
the prefetch buffer is accessed with any length other than word length, the correct endian conversion is not
performed and thus the wrong data will be read. This is due to hardware restrictions related to the endian
conversion mechanism.
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