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URL https://opencores.org/ocsvn/configurable_crc_core/configurable_crc_core/trunk

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Rev 1 → Rev 2

/trunk/rtl/cfg_crc.v
0,0 → 1,33
module cfg_crc #(
parameter datw = 6,
parameter [datw - 1: 0] coff = 6'b10_0101
)
(
input clk, rst,
input rst_syn,
input crc_en,
input dat_i,
output reg [datw - 2: 0] dat_o
);
wire lsb = dat_i ^ dat_o[datw - 2];
integer i;
always@(posedge clk or posedge rst) begin
if (rst)
dat_o <= 0;
else if (rst_syn)
dat_o <= 0;
else if (crc_en) begin
dat_o[0] <= lsb;
//dat_o[datw - 2: 1] <= dat_o[datw - 3: 0] ^ coff[datw -2: 1];
for (i = 0; i <= (datw - 3) ; i = i + 1) begin
if (coff[i + 1])
dat_o[i + 1] <= dat_o[i] ^ lsb;
else
dat_o[i + 1] <= dat_o[i];
end
end
end
 
endmodule
/trunk/tb/crc_cmp_tb.v
0,0 → 1,71
module crc_cmp_tb();
 
parameter datw = 8;
reg clk, rst, rst_syn;
reg crc_en;
reg [15: 0] random_dat;
wire dat_i = random_dat[15];
wire [datw - 2: 0] dat_o, dat_o_2;
initial begin
clk = 0;
forever #5 clk = ~clk;
end
initial begin
rst_syn = 0;
crc_en = 0;
end
initial begin
rst = 0;
#200 rst = 1;
#20 rst = 0;
end
initial begin
@(negedge rst)
repeat(20) begin
CRC_task;
if (dat_o == dat_o_2)
$display("\tData is correct!\n");
end
end
task CRC_task;
 
begin
random_dat = 16'hff;//$random();
rst_syn = 1;
#20
rst_syn = 0;
repeat (16) begin
crc_en = 1;
@(posedge clk)
random_dat = random_dat << 1;
end
crc_en = 0;
end
endtask
cfg_crc
#(
.datw(datw),
.coff(8'b1000_1001)
) CRC_F0
(
.clk(clk), .rst(rst),
.rst_syn(rst_syn),
.crc_en(crc_en),
.dat_i(dat_i),
.dat_o(dat_o)
);
crc_7 CRC_F1(
.clk(clk), .rst(rst_syn),
.crc_en(crc_en),
.sda_i(dat_i),
.crc_o(dat_o_2)
);
endmodule
/trunk/tb/crc_7.v
0,0 → 1,28
module crc_7(
input clk, rst,
input crc_en,
input sda_i,
output reg [ 6: 0] crc_o
);
 
wire inv = sda_i ^ crc_o[6];
//CRC-7 = x7 + x3 + 1
always @(posedge clk or posedge rst) begin
if (rst) begin
crc_o <= 0;
end
else begin
if (crc_en == 1) begin
crc_o[6] <= crc_o[5];
crc_o[5] <= crc_o[4];
crc_o[4] <= crc_o[3];
crc_o[3] <= crc_o[2] ^ inv;
crc_o[2] <= crc_o[1];
crc_o[1] <= crc_o[0];
crc_o[0] <= inv;
end
end
end
endmodule
 
/trunk/readme.txt
0,0 → 1,3
I konw little of CRC calculation,
this module is base on https://www.ghsi.de/CRC/index.php?
I just make is configurable...

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