基于网络编码的多信源组播通信系统，包括源代码，原理图等

r_1 && (!empty_payloadfifo_router_2)) begin

rd_en_payloadfifo_router_2 <= 1;

rd_en_payloadfifo_router_1 <= 0;

counter_getdata <= 0;

router_status <= GET_DATA2;

end

//FIFO ctrl payload 1 is inempty, read from this FIFO,

//coding will be unnecessary

else if ((!empty_payloadfifo_router_1) && empty_payloadfifo_router_2) begin

rd_en_payloadfifo_router_1 <= 1;

rd_en_payloadfifo_router_2 <= 0;

counter_getdata <= 0;

router_status <= GET_DATA1;

end

//both FIFO ctrl payload 1&2 are inempty, read from both

//of them, coding is needed

else if ((!empty_payloadfifo_router_1) && (!empty_payloadfifo_router_2)) begin

rd_en_payloadfifo_router_1 <= 1;

rd_en_payloadfifo_router_2 <= 1;

counter_getdata <= 0;

router_status <= GET_BOTH;

end

end

end //state JUDGE ends

//read data from FIFO ctrl payload 2

GET_DATA2: begin

val_router_packingfifo <= 0; //clear the output valid signal

//read-FIFO-delay

if (counter_getdata < 2'b01) begin

counter_getdata <= counter_getdata + 1;

router_status <= GET_DATA2;

rd_en_payloadfifo_router_2 <= 0; //clear rd_en signal

end

else begin

data_temp2 <= data_payloadfifo_router_2;

ctrl_temp2 <= ctrl_payloadfifo_router_2;

router_status <= SEND_DATA2;

end

end //state GET_DATA2 ends

//send data to packing fifo without coding

SEND_DATA2: begin

if (!rdy_router_packingfifo) begin

router_status <= SEND_DATA2;

end

else begin

data_router_packingfifo <= {ctrl_temp2, 1'b0 , data_temp2 }; //MSB = 0 means it is an uncoded pkt

val_router_packingfifo <= 1;

//this is the end of a packet, goto JUDGE

if (& (ctrl_temp2)) begin

router_status <= JUDGE;

end

//this is not the end of a packet, goto GET_DATA2

else begin

router_status <= GET_DATA2;

rd_en_payloadfifo_router_2 <= 1;

counter_getdata <= 0;

end

end

end //state SEND_DATA2 ends

GET_DATA1: begin

val_router_packingfifo <= 0; //clear output valid signal

//read-FIFO-delay

if (counter_getdata < 2'b01) begin

counter_getdata <= counter_getdata + 1;

router_status <= GET_DATA1;

rd_en_payloadfifo_router_1 <= 0; //clear rd_en signal

end

else begin

data_temp1 <= data_payloadfifo_router_1;

ctrl_temp1 <= ctrl_payloadfifo_router_1;

rd_en_payloadfifo_router_1 <= 0;

router_status <= SEND_DATA1;

end

end //state GET_DATA1 ends

SEND_DATA1: begin

if (!rdy_router_packingfifo) begin

router_status <= SEND_DATA1;

end

else begin

data_router_packingfifo <= {ctrl_temp1, 1'b0 , data_temp1 }; //MSB = 0 means it is an uncoded pkt

val_router_packingfifo <= 1;

//this is the end of a packet, goto JUDGE

if (& (ctrl_temp1)) begin

router_status <= JUDGE;

end

//this is not the end of a packet, goto GET_DATA1

else begin

router_status <= GET_DATA1;

rd_en_payloadfifo_router_1 <= 1;

counter_getdata <= 0;

end

end

end //state SEND_DATA1 ends