Xilinx MicroBlaze Reference Manual page 78

Chapter 2: MicroBlaze Architecture
The contents of the cache are preserved when the cache is disabled.
WDC Instruction
The optional WDC instruction (C_ALLOW_DCACHE_WR=1) is used to invalidate or flush cache
lines in the data cache from an application. For a detailed description, please refer to
MicroBlaze Instruction Set
The WDC instruction can also be used together with parity protection to periodically invalidate
entries the cache, to avoid accumulating errors.
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Chapter 5,
MicroBlaze Processor Reference Guide
UG081 (v14.7)