The taps are identical for both XOR-based and XNOR-based LSFRs, although the resulting sequences are different. Multiple alternative tap combinations can also yield maximum-length LFSRs. For example, ...
LFSR Counter Generator is a command-line application that generates Verilog or VHDL code for an LFSR counter of any value up to 63 bit wide. The code is written in C and is cross-platform compatible ...