Decimate module by 4

decimate_x4_v1_0.v

/**
  Module name: decimate_x4_v1_0
  Author: P Trujillo (pablo@controlpaths.com)
  Date: Nov 2020
  Description: Module to decimate by 4 increasing 1 bit resolution.
  Revision: 1.0 Module created.
**/

module decimate_x4_v1_0 #(
  parameter pw_input_width = 14
  )(
  input clk,
  input rstn,
  input signed [pw_input_width-1:0] i_data,
  input i_data_valid,

  output o_data_valid,
  output reg signed [pw_input_width:0] or_data
  );

  reg signed [pw_input_width:0] rp_data_0;
  reg signed [pw_input_width:0] rp_data_1;
  reg signed [pw_input_width:0] rp_data_2;
  reg signed [pw_input_width:0] rp_data_3;

  reg [1:0] r2_data_counter;

  always @(posedge clk)
    if (!rstn) begin
      rp_data_1 <= 0;
      rp_data_2 <= 0;
      rp_data_3 <= 0;
      r2_data_counter <= 2'd0;
    end
    else
      if (i_data_valid) begin
        rp_data_0 <= {i_data[13], i_data};
        rp_data_1 <= rp_data_0;
        rp_data_2 <= rp_data_1;
        rp_data_3 <= rp_data_2;

        r2_data_counter <= r2_data_counter + 2'b1;
      end

  always @(posedge clk)
    if (!rstn)
      or_data <= 0;
    else
      if (&r2_data_counter)
        or_data <= rp_data_0[14:1] + rp_data_1[14:1] + rp_data_2[14:1] + rp_data_3[14:1];

endmodule