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Rework CRC check

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This commit is contained in:
Alex Forencich 2015-10-09 22:56:52 -07:00
parent 08afe3a5d2
commit 9d90f09de5
1 changed files with 12 additions and 2 deletions
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14
rtl/axis_eth_fcs_check_64.v
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@ -115,6 +115,8 @@ reg [31:0] crc_next5_save = 0;
reg [31:0] crc_next6_save = 0;
reg [31:0] crc_next7_save = 0;
reg [31:0] crc_check = 0;
// internal datapath
reg [63:0] output_axis_tdata_int;
reg [7:0] output_axis_tkeep_int;
@ -235,48 +237,56 @@ always @* begin
fcs_output_tdata_1 = {56'd0, ~crc_next4_save[31:24]};
fcs_output_tkeep_0 = 8'b00011111;
fcs_output_tkeep_1 = 8'b00000000;
crc_check = ~crc_next0;
end
8'b00000011: begin
fcs_output_tdata_0 = {~crc_next5_save[15:0], input_axis_tdata_d0[47:0]};
fcs_output_tdata_1 = {48'd0, ~crc_next5_save[31:16]};
fcs_output_tkeep_0 = 8'b00111111;
fcs_output_tkeep_1 = 8'b00000000;
crc_check = ~crc_next1;
end
8'b00000111: begin
fcs_output_tdata_0 = {~crc_next6_save[7:0], input_axis_tdata_d0[55:0]};
fcs_output_tdata_1 = {40'd0, ~crc_next6_save[31:8]};
fcs_output_tkeep_0 = 8'b01111111;
fcs_output_tkeep_1 = 8'b00000000;
crc_check = ~crc_next2;
end
8'b00001111: begin
fcs_output_tdata_0 = input_axis_tdata_d0;
fcs_output_tdata_1 = {32'd0, ~crc_next7_save[31:0]};
fcs_output_tkeep_0 = 8'b11111111;
fcs_output_tkeep_1 = 8'b00000000;
crc_check = ~crc_next3;
end
8'b00011111: begin
fcs_output_tdata_0 = {24'd0, ~crc_next0[31:0], input_axis_tdata[7:0]};
fcs_output_tdata_1 = 0;
fcs_output_tkeep_0 = 8'b00000001;
fcs_output_tkeep_1 = 8'b00000000;
crc_check = ~crc_next4;
end
8'b00111111: begin
fcs_output_tdata_0 = {16'd0, ~crc_next1[31:0], input_axis_tdata[15:0]};
fcs_output_tdata_1 = 0;
fcs_output_tkeep_0 = 8'b00000011;
fcs_output_tkeep_1 = 8'b00000000;
crc_check = ~crc_next5;
end
8'b01111111: begin
fcs_output_tdata_0 = {8'd0, ~crc_next2[31:0], input_axis_tdata[23:0]};
fcs_output_tdata_1 = 0;
fcs_output_tkeep_0 = 8'b00000111;
fcs_output_tkeep_1 = 8'b00000000;
crc_check = ~crc_next6;
end
8'b11111111: begin
fcs_output_tdata_0 = {~crc_next3[31:0], input_axis_tdata[31:0]};
fcs_output_tdata_1 = 0;
fcs_output_tkeep_0 = 8'b00001111;
fcs_output_tkeep_1 = 8'b00000000;
crc_check = ~crc_next7;
end
default: begin
fcs_output_tdata_0 = 0;
@ -379,7 +389,7 @@ always @* begin
output_axis_tlast_int = 1;
output_axis_tuser_int = input_axis_tuser;
output_axis_tkeep_int = fcs_output_tkeep_0;
if (input_axis_tdata_masked != fcs_output_tdata_1 || input_axis_tdata_d0 != fcs_output_tdata_0) begin
if (crc_check != 32'h2144df1c) begin
output_axis_tuser_int = 1;
error_bad_fcs_next = 1;
end
@ -388,7 +398,7 @@ always @* begin
end else begin
last_cycle_tkeep_next = fcs_output_tkeep_0;
last_cycle_tuser_next = input_axis_tuser;
if (input_axis_tdata_masked != fcs_output_tdata_0) begin
if (crc_check != 32'h2144df1c) begin
error_bad_fcs_next = 1;
last_cycle_tuser_next = 1;
end