mirror of
https://github.com/jhshi/openofdm.git
synced 2024-12-30 10:39:11 +00:00
70 lines
4.9 KiB
Verilog
70 lines
4.9 KiB
Verilog
//-----------------------------------------------------------------------------
|
|
// Copyright (C) 2009 OutputLogic.com
|
|
// This source file may be used and distributed without restriction
|
|
// provided that this copyright statement is not removed from the file
|
|
// and that any derivative work contains the original copyright notice
|
|
// and the associated disclaimer.
|
|
//
|
|
// THIS SOURCE FILE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS
|
|
// OR IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
|
|
// WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
|
|
//-----------------------------------------------------------------------------
|
|
// CRC module for data[7:0] , crc[31:0]=1+x^1+x^2+x^4+x^5+x^7+x^8+x^10+x^11+x^12+x^16+x^22+x^23+x^26+x^32;
|
|
//-----------------------------------------------------------------------------
|
|
module crc32(
|
|
input [7:0] data_in,
|
|
input crc_en,
|
|
output [31:0] crc_out,
|
|
input rst,
|
|
input clk);
|
|
|
|
reg [31:0] lfsr_q,lfsr_c;
|
|
|
|
assign crc_out = lfsr_q;
|
|
|
|
always @(*) begin
|
|
lfsr_c[0] = lfsr_q[24] ^ lfsr_q[30] ^ data_in[0] ^ data_in[6];
|
|
lfsr_c[1] = lfsr_q[24] ^ lfsr_q[25] ^ lfsr_q[30] ^ lfsr_q[31] ^ data_in[0] ^ data_in[1] ^ data_in[6] ^ data_in[7];
|
|
lfsr_c[2] = lfsr_q[24] ^ lfsr_q[25] ^ lfsr_q[26] ^ lfsr_q[30] ^ lfsr_q[31] ^ data_in[0] ^ data_in[1] ^ data_in[2] ^ data_in[6] ^ data_in[7];
|
|
lfsr_c[3] = lfsr_q[25] ^ lfsr_q[26] ^ lfsr_q[27] ^ lfsr_q[31] ^ data_in[1] ^ data_in[2] ^ data_in[3] ^ data_in[7];
|
|
lfsr_c[4] = lfsr_q[24] ^ lfsr_q[26] ^ lfsr_q[27] ^ lfsr_q[28] ^ lfsr_q[30] ^ data_in[0] ^ data_in[2] ^ data_in[3] ^ data_in[4] ^ data_in[6];
|
|
lfsr_c[5] = lfsr_q[24] ^ lfsr_q[25] ^ lfsr_q[27] ^ lfsr_q[28] ^ lfsr_q[29] ^ lfsr_q[30] ^ lfsr_q[31] ^ data_in[0] ^ data_in[1] ^ data_in[3] ^ data_in[4] ^ data_in[5] ^ data_in[6] ^ data_in[7];
|
|
lfsr_c[6] = lfsr_q[25] ^ lfsr_q[26] ^ lfsr_q[28] ^ lfsr_q[29] ^ lfsr_q[30] ^ lfsr_q[31] ^ data_in[1] ^ data_in[2] ^ data_in[4] ^ data_in[5] ^ data_in[6] ^ data_in[7];
|
|
lfsr_c[7] = lfsr_q[24] ^ lfsr_q[26] ^ lfsr_q[27] ^ lfsr_q[29] ^ lfsr_q[31] ^ data_in[0] ^ data_in[2] ^ data_in[3] ^ data_in[5] ^ data_in[7];
|
|
lfsr_c[8] = lfsr_q[0] ^ lfsr_q[24] ^ lfsr_q[25] ^ lfsr_q[27] ^ lfsr_q[28] ^ data_in[0] ^ data_in[1] ^ data_in[3] ^ data_in[4];
|
|
lfsr_c[9] = lfsr_q[1] ^ lfsr_q[25] ^ lfsr_q[26] ^ lfsr_q[28] ^ lfsr_q[29] ^ data_in[1] ^ data_in[2] ^ data_in[4] ^ data_in[5];
|
|
lfsr_c[10] = lfsr_q[2] ^ lfsr_q[24] ^ lfsr_q[26] ^ lfsr_q[27] ^ lfsr_q[29] ^ data_in[0] ^ data_in[2] ^ data_in[3] ^ data_in[5];
|
|
lfsr_c[11] = lfsr_q[3] ^ lfsr_q[24] ^ lfsr_q[25] ^ lfsr_q[27] ^ lfsr_q[28] ^ data_in[0] ^ data_in[1] ^ data_in[3] ^ data_in[4];
|
|
lfsr_c[12] = lfsr_q[4] ^ lfsr_q[24] ^ lfsr_q[25] ^ lfsr_q[26] ^ lfsr_q[28] ^ lfsr_q[29] ^ lfsr_q[30] ^ data_in[0] ^ data_in[1] ^ data_in[2] ^ data_in[4] ^ data_in[5] ^ data_in[6];
|
|
lfsr_c[13] = lfsr_q[5] ^ lfsr_q[25] ^ lfsr_q[26] ^ lfsr_q[27] ^ lfsr_q[29] ^ lfsr_q[30] ^ lfsr_q[31] ^ data_in[1] ^ data_in[2] ^ data_in[3] ^ data_in[5] ^ data_in[6] ^ data_in[7];
|
|
lfsr_c[14] = lfsr_q[6] ^ lfsr_q[26] ^ lfsr_q[27] ^ lfsr_q[28] ^ lfsr_q[30] ^ lfsr_q[31] ^ data_in[2] ^ data_in[3] ^ data_in[4] ^ data_in[6] ^ data_in[7];
|
|
lfsr_c[15] = lfsr_q[7] ^ lfsr_q[27] ^ lfsr_q[28] ^ lfsr_q[29] ^ lfsr_q[31] ^ data_in[3] ^ data_in[4] ^ data_in[5] ^ data_in[7];
|
|
lfsr_c[16] = lfsr_q[8] ^ lfsr_q[24] ^ lfsr_q[28] ^ lfsr_q[29] ^ data_in[0] ^ data_in[4] ^ data_in[5];
|
|
lfsr_c[17] = lfsr_q[9] ^ lfsr_q[25] ^ lfsr_q[29] ^ lfsr_q[30] ^ data_in[1] ^ data_in[5] ^ data_in[6];
|
|
lfsr_c[18] = lfsr_q[10] ^ lfsr_q[26] ^ lfsr_q[30] ^ lfsr_q[31] ^ data_in[2] ^ data_in[6] ^ data_in[7];
|
|
lfsr_c[19] = lfsr_q[11] ^ lfsr_q[27] ^ lfsr_q[31] ^ data_in[3] ^ data_in[7];
|
|
lfsr_c[20] = lfsr_q[12] ^ lfsr_q[28] ^ data_in[4];
|
|
lfsr_c[21] = lfsr_q[13] ^ lfsr_q[29] ^ data_in[5];
|
|
lfsr_c[22] = lfsr_q[14] ^ lfsr_q[24] ^ data_in[0];
|
|
lfsr_c[23] = lfsr_q[15] ^ lfsr_q[24] ^ lfsr_q[25] ^ lfsr_q[30] ^ data_in[0] ^ data_in[1] ^ data_in[6];
|
|
lfsr_c[24] = lfsr_q[16] ^ lfsr_q[25] ^ lfsr_q[26] ^ lfsr_q[31] ^ data_in[1] ^ data_in[2] ^ data_in[7];
|
|
lfsr_c[25] = lfsr_q[17] ^ lfsr_q[26] ^ lfsr_q[27] ^ data_in[2] ^ data_in[3];
|
|
lfsr_c[26] = lfsr_q[18] ^ lfsr_q[24] ^ lfsr_q[27] ^ lfsr_q[28] ^ lfsr_q[30] ^ data_in[0] ^ data_in[3] ^ data_in[4] ^ data_in[6];
|
|
lfsr_c[27] = lfsr_q[19] ^ lfsr_q[25] ^ lfsr_q[28] ^ lfsr_q[29] ^ lfsr_q[31] ^ data_in[1] ^ data_in[4] ^ data_in[5] ^ data_in[7];
|
|
lfsr_c[28] = lfsr_q[20] ^ lfsr_q[26] ^ lfsr_q[29] ^ lfsr_q[30] ^ data_in[2] ^ data_in[5] ^ data_in[6];
|
|
lfsr_c[29] = lfsr_q[21] ^ lfsr_q[27] ^ lfsr_q[30] ^ lfsr_q[31] ^ data_in[3] ^ data_in[6] ^ data_in[7];
|
|
lfsr_c[30] = lfsr_q[22] ^ lfsr_q[28] ^ lfsr_q[31] ^ data_in[4] ^ data_in[7];
|
|
lfsr_c[31] = lfsr_q[23] ^ lfsr_q[29] ^ data_in[5];
|
|
|
|
end // always
|
|
|
|
always @(posedge clk, posedge rst) begin
|
|
if(rst) begin
|
|
lfsr_q <= {32{1'b1}};
|
|
end
|
|
else begin
|
|
lfsr_q <= crc_en ? lfsr_c : lfsr_q;
|
|
end
|
|
end // always
|
|
endmodule // crc
|