CICfilter.v.bak

module CIC_Filter (
    input wire [15:0] AUD_IN,
    output wire [15:0] AUD_OUT,
    input wire LRCK
);
    // Define the parameters for the filter
    parameter R = 3;  // Decimation factor
    parameter M = 1;  // Differential delay

    // Internal signals
    reg [15:0] integrator = 16'h0000;
    reg [15:0] comb1 = 16'h0000;
    reg [15:0] comb2 = 16'h0000;
    reg [15:0] comb3 = 16'h0000;

    always @(posedge LRCK) begin
        // Comb Stage 1
        comb1 <= comb2;
        comb2 <= comb3;
        comb3 <= AUD_IN - comb1;

        // Integrator Stage
        if (M == 1) begin
            integrator <= integrator + comb3;
        end else begin
            integrator <= integrator >> M + comb3;
        end

        // Output Stage
        if (R == 1) begin
            AUD_OUT <= integrator;
        end else begin
            AUD_OUT <= integrator >> (R-1);
        end
    end
endmodule