%----m序列發生器(簡單型碼序列發生器-----simple shift register generator)
%                                  _____參見《FPGA設計及應用》褚振勇編 西安電子科技大學出版社

close
clear
connections=[1 0 0 1 1];%  移位寄存器系數
N=length(connections);
tmp1=fliplr(connections);%翻轉connecions
con=tmp1(2:N);
m=length(connections)-1;%  移位寄存器級數		
L=2^m-1;				% length of the shift register sequence requested
registers=[zeros(1,m-1) 1];		% initial register contents
% seq(1)=registers(m);			% first element of the sequence
for ii=1:L
    seq(ii)=registers(m);
    tmp2=registers*con';
    tmp2=mod(tmp2,2);
    registers(2:m)=registers(1:m-1);
    registers(1)=tmp2;
end;