FIR FILTER-VLSI CODE

//FIR FILTER

module FIR_8thOrder (Data_out, Data_in, clock, reset);

parameter order = 8;

parameter word_size_in = 8;

parameter word_size_out = 2 * word_size_in + 2;

parameter b0 = 8'd7;

parameter b1 = 8'd17;

parameter b2 = 8'd32;

parameter b3 = 8'd46;

parameter b4 = 8'd52;

parameter b5 = 8'd46;

parameter b6 = 8'd32;

parameter b7 = 8'd17;

parameter b8 = 8'd7;

output [word_size_out-1 : 0] Data_out;

input [word_size_in-1 : 0] Data_in;

input clock, reset;

reg [word_size_in-1:0] Samples [0 : order];

integer k;

assign Data_out = b0 * Samples[0]

                                   + b1 * Samples[1]

                                   + b2 * Samples[2]

                                   + b3 * Samples[3]

                                   + b4 * Samples[4]

                                   + b5 * Samples[5]

                                   + b6 * Samples[6]

                                   + b7 * Samples[7]

                                   +b8 * Samples[8];

always @ (posedge clock)

if (reset == 1)

begin    for (k = 0; k <= order; k = k+1)

                       Samples[k] <= 0;

end

else

begin

Samples[0] <= Data_in;

for( k = 1; k <= order; k = k+1)

Samples[k] <= Samples[k-1];

end

endmodule