iic bidirection signal
When defining a project, it's a good idea to start with checking the feasibility.
You may want to consult the datasheets of I2C bidirectional buffers, e.g. Philips/NXP P82B96 to understand,
why "feed through" doesn't work with a FPGA. In a short, it depends on a special hardware, that detects different voltage
levels at the bus. There's a theoretical option, to decode the protocol completely and detect the data direction for each bit.