写一个verilog fir滤波器

verilog fir滤波器的实现很简单，只需要定义系数，定义输入和输出宽度，然后定义计算单元，最后定义滤波器的输出。具体实现过程如下：module fir_filter (clk, rst, x, y);
input clk, rst;
input [31:0] x;
output [31:0] y; //定义系数
parameter [31:0] coefs = {c0, c1, c2, c3, c4, c5, c6, c7, c8, c9}; //定义输入和输出宽度
reg [31:0] x_reg [9:0];
wire [31:0] y_wire; //定义计算单元
always @(posedge clk or posedge rst)
if (rst)
x_reg <= 0;
else
x_reg <= {x_reg[8:0], x}; //定义滤波器的输出
assign y_wire = x_reg[8] * coefs[0] + x_reg[7] * coefs[1] +
x_reg[6] * coefs[2] + x_reg[5] * coefs[3] +
x_reg[4] * coefs[4] + x_reg[3] * coefs[5] +
x_reg[2] * coefs[6] + x_reg[1] * coefs[7] +
x_reg[0] * coefs[8] + x * coefs[9];
assign y = y_wire;endmodule