习题笔记 Lfsr32

Build a 32-bit Galois LFSR with taps at bit positions 32, 22, 2, and 1.

module top_module(
    input clk,
    input reset,    // Active-high synchronous reset to 32'h1
    output [31:0] q
); 
    reg [31:0]q_next;

    always @(*)
    begin
        q_next[0] = q[1] ^ q[0];
        q_next[1] = q[2] ^ q[0];
        q_next[21] = q[22] ^ q[0];
        q_next[20:2] = q[21:3];
        q_next[31:22] = {q[0],q[31:23]};
    end 

    always @(posedge clk)
        if(reset)
        q <=32'b1;
        else q <= q_next;



endmodule