I need to put seven 128bit linear feedack shift registers on a FPGA chip. Are there any FPGA's that can impliment this? Thank you.
Electronic – Putting linear feedback shift registers on FPGA’s
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Best Answer
Event the very smallest FPGAs, and most CPLDs can do this. Each element of the shift register needs a single FF element, call that 1/4 of a slice, the xor for the tap logic will go into the LUT. Look at your datasheets, anything with > 300 slices should do it. You'll need extra logic to pre-load a value, control reset and sample the outputs, and probably clock enable logic as you would not want it free-running with the global clock while you read the final state.