/*-----------------------------------------------------------------------------------------------
HotCRC CRC16L_1021_FFFF_0000 FPGA模块 HotPower[url=home.php?mod=space&uid=516618]@163.com[/url] 2023-09-21 11:55:44
-----------------------------------------------------------------------------------------------*/
module CRC16L_1021(clk, rst, data, outcrc16)
input clk, rst;
input [7:0] data;
output reg[15:0] outcrc16;
reg [15:0] crc16;
task CRC16L_1021;
inout[15:0] crc16;
input[7:0] indata;
crc16 = {crc16[7:0], 8'h00} ^ CRC16L_1021_Table(crc16[15:8] ^ indata);
endtask
function [15:0] CRC16L_1021_Table;
input [7:0] data;
CRC16L_1021_Table = CRC16L_1021_Table0(data[1:0]) ^ CRC16L_1021_Table1(data[3:2]) ^ CRC16L_1021_Table2(data[5:4]) ^ CRC16L_1021_Table3(data[7:6]);
endfunction
function [15:0] CRC16L_1021_Table0;
input[1:0] data;
case(data)
2'b00: CRC16L_1021_Table0 = 16'h0000; 2'b01: CRC16L_1021_Table0 = 16'h1021; 2'b10: CRC16L_1021_Table0 = 16'h2042; 2'b11: CRC16L_1021_Table0 = 16'h3063;
default: CRC16L_1021_Table0 = 16'h0000;
endcase
endfunction
function [15:0] CRC16L_1021_Table1;
input[1:0] data;
case(data)
2'b00: CRC16L_1021_Table1 = 16'h0000; 2'b01: CRC16L_1021_Table1 = 16'h4084; 2'b10: CRC16L_1021_Table1 = 16'h8108; 2'b11: CRC16L_1021_Table1 = 16'hC18C;
default: CRC16L_1021_Table1 = 16'h0000;
endcase
endfunction
function [15:0] CRC16L_1021_Table2;
input[1:0] data;
case(data)
2'b00: CRC16L_1021_Table2 = 16'h0000; 2'b01: CRC16L_1021_Table2 = 16'h1231; 2'b10: CRC16L_1021_Table2 = 16'h2462; 2'b11: CRC16L_1021_Table2 = 16'h3653;
default: CRC16L_1021_Table2 = 16'h0000;
endcase
endfunction
function [15:0] CRC16L_1021_Table3;
input[1:0] data;
case(data)
2'b00: CRC16L_1021_Table3 = 16'h0000; 2'b01: CRC16L_1021_Table3 = 16'h48C4; 2'b10: CRC16L_1021_Table3 = 16'h9188; 2'b11: CRC16L_1021_Table3 = 16'hD94C;
default: CRC16L_1021_Table3 = 16'h0000;
endcase
endfunction
always [url=home.php?mod=space&uid=72445]@[/url] (posedge clk or negedge rst)
begin
if (!rst)
begin
crc16 <= 16'hFFFF;
end
else
begin
CRC16L_1021(crc16, data);
outcrc16 <= crc16;
crc16 <= crc16;
end
end
endmodule
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