HELP, How to Output 8 bit data(11001100) from FPGA to one of IO port.

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1) Perhaps to build a shift register logic?

2) Transmit the serial data out through state machine control.

3) Use CV transceiver (Best Option)

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How's using the transceiver the best option?

It's a massively complicated option if all he has to do is shift an 8 bit pattern out on a pin.

To the OP, use a shift register!

Nial.