Adding README_tag.md

LaplaceKorea · Oct 17, 2020 · a401050 · a401050
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+Description: This tag is from a branch where we experimented with sending
+write data along with store misses, so that the combined data was filled into
+the cache RAMs directly. The issue with this approach is that while it saves
+roughly a single cycle in the cache miss cache, it complicated the data path
+added a large mux on the fill path. Instead, reusing the write buffer is a
+better approach.