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You can write your own core, so you can encode any data however you want.
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Thanks for your comment. Actually, my purpose when posting this thread is like this. I have a design running in FPGA (stratix IV GT) that sends data to a transceiver SMA connector on the development board. I connect the cable from this connector to an Oscilloscope to observe the output signal. If I choose to send a known bit sequence, what do I expect to see in the scope? This leads me to believe that the signal observed on scope depends on what data encoding technique used to encode the data (bit sequence).
And I am not sure, but think that this is done by physical layer protocol (PMD sublayer). In my case, I use Ethernet protocol with 10GBase-r IP core as physical block (PCS+PMA). So, I just think that maybe this is a built in hardware functionality (transceiver technology). That is why I want to get some advice from this thread post. But your answer comment tells me that this is something we can decide by coding. Please put some more details or correct my understanding.
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