One should not use abbreviations unless they are well known outside the group that uses them... e.g. VHDL, JTAG, PCI, etc
PCA.
Google comes back with the following:
1. Principal Component Analysis
2. Porsche Club of America
3. Presbyterian Church in America
4. PCA Skin Professional Skin Care Products & Aesthetician
5. PCA Engineering: Cathodic Protection Testing & Solutions
6. PCA Engineering
I suspect none of these are related to what you are looking for.
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Tricky,
As you're pointing the OP to opencores, maybe you know what PCA stands for?