~ruther/vhdl-i2c

ref: c883d63319067c2b820d92e034d94819850496e6 vhdl-i2c/src d---------
fix: compilation errors
feat: add i2c slave state entity
feat: add i2c misc entities
feat: add i2c rx, tx entities
feat: add utility entities

Delay, metastability filter, open drain buffer, synchronous edge detector
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