MicroBlaze Processor Reference Guide 89
UG984 (v2018.2) June 21, 2018 www.xilinx.com
Chapter 2: MicroBlaze Architecture
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
Chapter 5, MicroBlaze Instruction Set Architecture.
The WDC instruction can also be used together with parity protection to periodically
invalidate entries the cache, to avoid accumulating errors.
With an external L2 cache, such as the System Cache, connected to MicroBlaze using the
ACE interface, external cache invalidate or flush can be performed with WDC. See the
LogiCore IP System Cache Product Guide (PG118)
[Ref 6] for more information on the System
Cache.
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