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I need to do this in order to get duobinary modulations from the signal transmit from transceivers. In this case I would need transmit the sequence achieved after the sum of PRBS sequence + PRBS shifted.
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Are you using actual *transceivers*? In that case, you cannot perform the shift-and-add in the time domain of the transceiver, you have to perform it in the parallel domain of the FPGA fabric. If you read the tutorial at the link I posted, it shows how to create multiple bits out of a PRBS in one FPGA fabric clock period. You would use that, along with your shift-and-add logic, and then send the result to the transceiver.
Cheers,
Dave
Honored Contributor
