//----------------------------------------------------- // Design Name : parallel_crc_ccitt // File Name : parallel_crc.v // Function : CCITT Parallel CRC // Coder : Deepak Kumar Tala //----------------------------------------------------- module parallel_crc_ccitt ( clk , reset , enable , init , data_in , crc_out ); //-----------Input Ports--------------- input clk ; input reset ; input enable ; input init ; input [7:0] data_in ; //-----------Output Ports--------------- output [15:0] crc_out; //------------Internal Variables-------- reg [15:0] crc_reg; wire [15:0] next_crc; //-------------Code Start----------------- assign crc_out = crc_reg; // CRC Control logic always @ (posedge clk) if (reset) begin crc_reg <= 16'hFFFF; end else if (enable) begin if (init) begin crc_reg <= 16'hFFFF; end else begin crc_reg <= next_crc; end end // Parallel CRC calculation assign next_crc[0] = data_in[7] ^ data_in[0] ^ crc_reg[4] ^ crc_reg[11]; assign next_crc[1] = data_in[1] ^ crc_reg[5]; assign next_crc[2] = data_in[2] ^ crc_reg[6]; assign next_crc[3] = data_in[3] ^ crc_reg[7]; assign next_crc[4] = data_in[4] ^ crc_reg[8]; assign next_crc[5] = data_in[7] ^ data_in[5] ^ data_in[0] ^ crc_reg[4] ^ crc_reg[9] ^ crc_reg[11]; assign next_crc[6] = data_in[6] ^ data_in[1] ^ crc_reg[5] ^ crc_reg[10]; assign next_crc[7] = data_in[7] ^ data_in[2] ^ crc_reg[6] ^ crc_reg[11]; assign next_crc[8] = data_in[3] ^ crc_reg[0] ^ crc_reg[7]; assign next_crc[9] = data_in[4] ^ crc_reg[1] ^ crc_reg[8]; assign next_crc[10] = data_in[5] ^ crc_reg[2] ^ crc_reg[9]; assign next_crc[11] = data_in[6] ^ crc_reg[3] ^ crc_reg[10]; endmodule xen/log/tools/ioemu/patches/qemu-64bit'>logtree commit diff stats

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