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(四)

sedge clk or negedge rst_n) begin

//reset process

if (rst_n == 0) begin

router_status <= JUDGE;

data_temp1 <= 64'h0;

ctrl_temp1 <= 8'h0;

data_temp2 <= 64'h0;

ctrl_temp2 <= 8'h0;

counter_getdata <= 2'b0;

end

else begin

case (router_status)

JUDGE: begin

first_dword_1 <= 0;

first_dword_2 <= 0;

rand_num_en <= 0;

val_router_multiplier_2 <= 0; //clear some signals

//program hold, when packing FIFO inempty

if (!empty_packingfifo) begin

router_status <= JUDGE;

end

else begin

//both FIFO ctrl payload 1 & 2 are empty

if (empty_payloadfifo_router_1 && empty_payloadfifo_router_2) begin

rd_en_payloadfifo_router_1 <= 0;

rd_en_payloadfifo_router_2 <= 0;

router_status <= JUDGE;

end

//FIFO ctrl paylaod 2 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_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

GET_BOTH: begin

first_dword_2 <= 0; //

val_router_multiplier_2 <= 0; //clear valid signal

//read-FIFO-delay

if (counter_getdata < 2'b01) begin

counter_getdata <= counter_getdata + 1;

router_status <= GET_BOTH;

rd_en_payloadfifo_router_1 <= 0;

rd_en_payloadfifo_router_2 <= 0; //clear rd_en signals

end

else begin

data_temp1 <= data_payloadfifo_router_1;

ctrl_temp1 <= ctrl_payloadfifo_router_1;

data_temp2 <= data_payloadfifo_router_2;

ctrl_temp2 <= ctrl_payloadfifo_router_2;

router_status <= SEND_BOTH_1;

end

end //state GET_BOTH ends

//according to the random number generator, data from both

//input channels should be sent out seperately

SEND_BOTH_1: begin

if (!rdy_router_multiplier_1) begin

val_router_multiplier_1 <= 0;

router_status <= SEND_BOTH_1;

end

else

else begin

data_router_multiplier_1 <= data_temp1;

val_router_multiplier_1 <= 1;

if (ctrl_temp1 == 8'hff) begin

first_dword_1 <= 1;

rand_num_en <= 1;

end

else begin

first_dword_1 <=0;

rand_num_en <= 0;

end

router_status <= SEND_BOTH_2;

end

end //state SEND_BOTH_1 ends

SEND_BOTH_2: begin

first_dword_1 <= 0;