/**************udp_send.vTakes in data from the application along with a valid bit, an IP address and destination port number, and encapsulates it with the UDP header.  Outputs the data, a valid bit, the destination IP address, and the data length.Current implementation does not utilize checksum.jdp45 hmm32 mjk64ece 576cornell univnov 07**************/`define SOURCE_PORT 16'h0400`define CHECKSUM 16'h0module udp_send(	input             clk,	input             reset,	//from software app	input             data_in_valid,	input [31:0]      data_in,	input [31:0]	  ip_addr_in,	input [15:0]	  dest_port,	input [15:0]	  length_in,	//to IP_send	output reg [31:0] ip_addr_out,	output reg        data_out_valid,	output reg [31:0] data_out,	output reg [15:0] length_out);reg [2:0] cnt, bufcnt;reg [31:0] data_buffer1, data_buffer2;always @(posedge clk) begin	if (reset) begin		cnt <= 2'h0;		bufcnt <= 2'h0;		ip_addr_out <= 32'b0;		data_out_valid <= 1'b0;		data_out <= 32'b0;		length_out <= 16'b0;		data_buffer1 <= 32'b0;		data_buffer2 <= 32'b0;	end	else if (data_in_valid) begin		case (cnt) 			0: begin				data_out <= {`SOURCE_PORT, dest_port};				data_out_valid <= 1'b1;				ip_addr_out <= ip_addr_in;				length_out <= length_in + 16'h8;				data_buffer1 <= data_in;				cnt <= cnt + 2'b1;				bufcnt <= bufcnt + 2'h1;			end			1: begin				data_out <= {length_out, `CHECKSUM};				data_out_valid <= 1'b1;				data_buffer2 <= data_buffer1;				data_buffer1 <= data_in;				cnt <= cnt + 2'b1;				bufcnt <= bufcnt + 2'h1;			end			2: begin				data_out_valid <= 1'b1;				data_out <= data_buffer2;				data_buffer2 <= data_buffer1;				data_buffer1 <= data_in;			end			default: cnt <= 2'h0;		endcase	end	else if (~data_in_valid) begin		if (bufcnt != 2'h0) begin			data_out_valid <= 1'b1;			data_out <= data_buffer2;			data_buffer2 <= data_buffer1;			data_buffer1 <= data_in;			bufcnt <= bufcnt - 2'h1;			cnt <= 2'h0;		end		else begin			data_out_valid <= 1'b0;			cnt <= 2'h0;		end	end	endendmodule