11.10 Manipulation of the Cache by an External Agent
Update
An update request causes the processor to write the specified data element into the specified cache line, and either change the state of the cache line to shared in both the primary and secondary caches, or leave the state of the cache line unchanged, depending on the nature of the update request. An external agent can issue updates to cache lines that are in either the exclusive or shared states without changing the state of the cache line (see the SysCmd(3) bit description in Chapter 12).
NOTE: If there is an update to a line in the primary instruction cache, the line in the secondary cache is updated and the primary instruction cache line is invalidated.
Copyright 1996, MIPS Technologies, Inc. -- 21 MAR 96
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