OpenFPGA/yosys/manual/PRESENTATION_ExOth/scrambler.v

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module scrambler(
input clk, rst, in_bit,
output reg out_bit
);
reg [31:0] xs;
always @(posedge clk) begin
if (rst)
xs = 1;
xs = xs ^ (xs << 13);
xs = xs ^ (xs >> 17);
xs = xs ^ (xs << 5);
out_bit <= in_bit ^ xs[0];
end
endmodule