7.5.6. Snoop filter support

In general, the Cortex-A15 processor can issue either a Write-Back or an evict transaction for any cache line that is removed from the L2 cache. You can use these messages to manage an external snoop filter. However, the snoop filter logic must not depend on an evict message for every clean line dropped from the Cortex-A15 processor caches. In some circumstances, the Cortex-A15 processor might not signal an eviction. For example, clean evictions are not guaranteed to occur in all cases for Write-Through memory types.

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