2module LDPC	(clk,reset,			 data_in, data_in_en,				 velocity, /*輸入信號(hào)碼率選擇*/			 data_out, data_out_en,			 indication /*輸出信號(hào)，第一個(gè)127要?jiǎng)h除前5成7488，指示第一個(gè)127*/				);input	clk,reset;input	data_in,data_in_en;input[1:0]	velocity; //碼率選擇信號(hào)output[126:0]	data_out; output	data_out_en;output	indication;parameter row_4 = 6'd24-1'b1;		// parameter column_4 = 6'd35-1'b1;  //0.4碼率parameter row_6 = 6'd36-1'b1;		// parameter column_6 = 6'd23-1'b1;  //0.6碼率parameter row_8 = 6'd48-1'b1;		// parameter column_8 = 6'd11-1'b1;  //0.8碼率parameter order = 7'd127-1'b1;parameter state0 = 1'b0; parameter state1 = 1'b1;reg[5:0] row_num;   // reg[5:0] column_num;//reset時(shí)，選擇合適的行，列數(shù)reg[5:0] count_row;	 // reg[4:0] count_col; // 行列計(jì)數(shù)器reg[6:0] count_127;reg	coder_first;always @ (posedge clk)  // 計(jì)數(shù)器運(yùn)轉(zhuǎn)	begin	if (!reset)		begin		count_127 <= 7'd0;		coder_first <= 1'b0;		case (velocity)		  2'b01 : 	//0.4碼率			begin								count_row <= 6'd23;  // 減法計(jì)數(shù)器			row_num <= row_4;			//column_num <= column_4;					end		  2'b10 :  	//0.6碼率			begin								count_row <= 6'd35;			row_num <= row_6;			//column_num <= column_6;				end		  2'b11 :	//0.8碼率			begin								count_row <= 6'd47;			row_num <= row_8;			//column_num <= column_8;				end			default :            // 默認(rèn)0.4碼率			begin								count_row <= 6'd23;			row_num <= row_4;			//column_num <= column_4;				end		endcase		end	else		begin		if(data_in_en)			begin			case (velocity)			  2'b01 : 	//0.4碼率				begin									if((count_row==6'd23)&&(count_127==0))					begin					coder_first<= 1'b1;					end				else					begin					coder_first<= 1'b0;					end				end			  2'b10 :  	//0.6碼率				begin									if((count_row==6'd35)&&(count_127==0))					begin					coder_first<= 1'b1;					end				else					begin					coder_first<= 1'b0;					end				end			  2'b11 :	//0.8碼率				begin									if((count_row==6'd47)&&(count_127==0))					begin					coder_first<= 1'b1;					end				else					begin					coder_first<= 1'b0;					end				end				default :            // 默認(rèn)0.4碼率				begin									if((count_row==6'd23)&&(count_127==0))					begin					coder_first<= 1'b1;					end				else					begin					coder_first<= 1'b0;					end				end			endcase							if(count_127 == order)				begin				count_127 <= 7'd0;				if(count_row == 6'd0)					begin					count_row <= row_num;					end				else					begin					count_row <= count_row - 1'b1;					end					end			else				begin				count_127 <= count_127 + 1'b1;				end				end					end	endreg	bit_in, bit_in_en;reg[34:0] media_en;reg[34:0] media_en0;reg state;reg[9:0]	address_04;reg[9:0]	address_06;reg[9:0]	address_08;always @(posedge clk)   // 控制個(gè)運(yùn)算模塊初始化等	begin	if (!reset)		begin		//coder_first <= 1'b0;		bit_in	<= 1'b0; bit_in_en <= 1'b0;		media_en <= 35'b00000_0000000000_0000000000_0000000001;     // 初始化時(shí)就寫(xiě)入第一個(gè)media		address_04 <= 10'd0; address_06 <= 10'd0; address_08 <= 10'd0;		state <= state0;		end	else 		begin		case (velocity)			2'b01 :  // 0.4 碼率			begin			bit_in	<= data_in; bit_in_en <= data_in_en;   // 輸入數(shù)據(jù)			if(data_in_en)				begin				case (state)					state0 :   //前35個(gè)符號(hào)，需要按順序?qū)edia寫(xiě)初始信息					begin					if(media_en == 35'b10000_0000000000_0000000000_0000000000)						begin						state <= state1;						media_en <= 35'd0;						if(count_row == 0)   //最后一行最后一個(gè)矩信息，復(fù)位rom地址							begin							address_04 <= 10'd0;							end						else							begin							address_04 <= address_04+1'b1;							end							end						else						begin								address_04 <= address_04+1'b1;                 // 狀態(tài)地址累加						media_en <= media_en << 1;                        //按順序更改35個(gè)運(yùn)算模塊的media_en，寫(xiě)入初始信息						end																end					state1 :   // 后面輸入數(shù)據(jù)，循環(huán)運(yùn)算即可，不需寫(xiě)矩陣初始信息					begin										if(count_127 == order)						begin						media_en <= 35'b00000_0000000000_0000000000_0000000001; //與第127個(gè)數(shù)據(jù)輸入同時(shí)，寫(xiě)入初始信息						state <= state0;                                      						end							end				endcase				end			end						2'b10 : // 0.6碼率			begin			bit_in	<= data_in; bit_in_en <= data_in_en;   // 輸入數(shù)據(jù)			if(data_in_en)				begin								case (state)					state0 :   //前23個(gè)符號(hào)，需要按順序?qū)edia寫(xiě)初始信息					begin					if(media_en == 35'b00000_0000000100_0000000000_0000000000)						begin						state <= state1;						media_en <= 35'd0;						if(count_row == 0)   //最后一行最后一個(gè)矩信息，復(fù)位rom地址							begin							address_06 <= 10'd0;							end						else							begin							address_06 <= address_06+1'b1;							end							end						else						begin								address_06 <= address_06+1'b1;                 // 狀態(tài)地址累加						media_en <= media_en << 1;                        //按順序更改35個(gè)運(yùn)算模塊的media_en，寫(xiě)入初始信息						end																end					state1 :   // 后面輸入數(shù)據(jù)，循環(huán)運(yùn)算即可，不需寫(xiě)矩陣初始信息					begin										if(count_127 == order)						begin						media_en <= 35'b00000_0000000000_0000000000_0000000001; //與第127個(gè)數(shù)據(jù)輸入同時(shí)，寫(xiě)入初始信息						state <= state0;                                      						end							end				endcase				end			end									2'b11 :			begin			bit_in	<= data_in; bit_in_en <= data_in_en;   // 輸入數(shù)據(jù)			if(data_in_en)				begin				case (state)					state0 :   //前35個(gè)符號(hào)，需要按順序?qū)edia寫(xiě)初始信息					begin					if(media_en == 35'b00000_000000000_0000000001_0000000000)						begin						state <= state1;						media_en <= 35'd0;						if(count_row == 0)   //最后一行最后一個(gè)矩信息，復(fù)位rom地址							begin							address_08 <= 10'd0;							end						else							begin							address_08 <= address_08+1'b1;							end							end						else						begin								address_08 <= address_08+1'b1;                 // 狀態(tài)地址累加						media_en <= media_en << 1;                        //按順序更改35個(gè)運(yùn)算模塊的media_en，寫(xiě)入初始信息						end																end					state1 :   // 后面輸入數(shù)據(jù)，循環(huán)運(yùn)算即可，不需寫(xiě)矩陣初始信息					begin										if(count_127 == order)						begin						media_en <= 35'b00000_0000000000_0000000000_0000000001; //與第127個(gè)數(shù)據(jù)輸入同時(shí)，寫(xiě)入初始信息						state <= state0;                                      						end							end				endcase				end			end					default :				begin				bit_in	<= data_in; bit_in_en <= data_in_en;   // 輸入數(shù)據(jù)				if(data_in_en)					begin					case (state)						state0 :   //前35個(gè)符號(hào)，需要按順序?qū)edia寫(xiě)初始信息						begin						if(media_en == 35'b10000_0000000000_0000000000_0000000000)							begin							state <= state1;							media_en <= 35'd0;							if(count_row == 0)   //最后一行最后一個(gè)矩信息，復(fù)位rom地址								begin								address_04 <= 9'd0;								end							else								begin								address_04 <= address_04+1'b1;								end								end							else							begin									address_04 <= address_04+1'b1;                 // 狀態(tài)地址累加							media_en <= media_en << 1;                        //按順序更改35個(gè)運(yùn)算模塊的media_en，寫(xiě)入初始信息							end																	end						state1 :   // 后面輸入數(shù)據(jù)，循環(huán)運(yùn)算即可，不需寫(xiě)矩陣初始信息						begin											if(count_127 == order)							begin							media_en <= 35'b00000_0000000000_0000000000_0000000001; //與第127個(gè)數(shù)據(jù)輸入同時(shí)，寫(xiě)入初始信息							state <= state0;                                      							end								end					endcase					end				end