Simple I2C slave model (IO expander)

I know that this has been asked for several times, but I haven't found a satisfying answer yet.

Has anybody got a simple vhdl model for an I2C slave ? All I need is to Read/Write some IO bits. I would like it to be as small as possible (20-40 Xilinx CLBs or Altera LCELLs).

Thanks for your help,


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Alex Ungerer
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