module openmips(
		input wire 	      clk,
		input wire 	      rst,


		input wire [`RegBus]  rom_data_i,
		output wire [`RegBus] rom_addr_o,
		output wire 	      rom_ce_o
		);
   
   wire [`InstAddrBus] 		      pc;
   wire [`InstAddrBus] 		      id_pc_i;
   wire [`InstBus] 		      id_inst_i;
   
   //连接译码阶段ID模块的输出与ID/EX模块的输入
   wire [`AluOpBus] 		      id_aluop_o;
   wire [`AluSelBus] 		      id_alusel_o;
   wire [`RegBus] 		      id_reg1_o;
   wire [`RegBus] 		      id_reg2_o;
   wire 			      id_wreg_o;
   wire [`RegAddrBus] 		      id_wd_o;
   
   //连接ID/EX模块的输出与执行阶段EX模块的输入
   wire [`AluOpBus] 		      ex_aluop_i;
   wire [`AluSelBus] 		      ex_alusel_i;
   wire [`RegBus] 		      ex_reg1_i;
   wire [`RegBus] 		      ex_reg2_i;
   wire 			      ex_wreg_i;
   wire [`RegAddrBus] 		      ex_wd_i;
   
   //连接执行阶段EX模块的输出与EX/MEM模块的输入
   wire 			      ex_wreg_o;
   wire [`RegAddrBus] 		      ex_wd_o;
   wire [`RegBus] 		      ex_wdata_o;

   //连接EX/MEM模块的输出与访存阶段MEM模块的输入
   wire 			      mem_wreg_i;
   wire [`RegAddrBus] 		      mem_wd_i;
   wire [`RegBus] 		      mem_wdata_i;

   //连接访存阶段MEM模块的输出与MEM/WB模块的输入
   wire 			      mem_wreg_o;
   wire [`RegAddrBus] 		      mem_wd_o;
   wire [`RegBus] 		      mem_wdata_o;
   
   //连接MEM/WB模块的输出与回写阶段的输入	
   wire 			      wb_wreg_i;
   wire [`RegAddrBus] 		      wb_wd_i;
   wire [`RegBus] 		      wb_wdata_i;
   
   //连接译码阶段ID模块与通用寄存器Regfile模块
   wire 			      reg1_read;
   wire 			      reg2_read;
   wire [`RegBus] 		      reg1_data;
   wire [`RegBus] 		      reg2_data;
   wire [`RegAddrBus] 		      reg1_addr;
   wire [`RegAddrBus] 		      reg2_addr;

   //pc_reg例化
   pc_reg pc_reg0(
		  .clk(clk),
		  .rst(rst),
		  .pc(pc),
		  .ce(rom_ce_o)	      
		  );
   
   assign rom_addr_o = pc;

   //IF/ID模块例化
   if_id if_id0(
		.clk(clk),
		.rst(rst),
		.if_pc(pc),
		.if_inst(rom_data_i),
		.id_pc(id_pc_i),
		.id_inst(id_inst_i)      	
		);
   
   //译码阶段ID模块
   id id0(
	  .rst(rst),
	  .pc_i(id_pc_i),
	  .inst_i(id_inst_i),

	  .reg1_data_i(reg1_data),
	  .reg2_data_i(reg2_data),

	  //送到regfile的信息
	  .reg1_read_o(reg1_read),
	  .reg2_read_o(reg2_read), 	  

	  .reg1_addr_o(reg1_addr),
	  .reg2_addr_o(reg2_addr), 
      
	  //送到ID/EX模块的信息
	  .aluop_o(id_aluop_o),
	  .alusel_o(id_alusel_o),
	  .reg1_o(id_reg1_o),
	  .reg2_o(id_reg2_o),
	  .wd_o(id_wd_o),
	  .wreg_o(id_wreg_o)
	  );

   //通用寄存器Regfile例化
   regfile regfile1(
		    .clk (clk),
		    .rst (rst),
		    .we	(wb_wreg_i),
		    .waddr (wb_wd_i),
		    .wdata (wb_wdata_i),
		    .re1 (reg1_read),
		    .raddr1 (reg1_addr),
		    .rdata1 (reg1_data),
		    .re2 (reg2_read),
		    .raddr2 (reg2_addr),
		    .rdata2 (reg2_data)
		    );

   //ID/EX模块
   id_ex id_ex0(
		.clk(clk),
		.rst(rst),
      
		//从译码阶段ID模块传递的信息
		.id_aluop(id_aluop_o),
		.id_alusel(id_alusel_o),
		.id_reg1(id_reg1_o),
		.id_reg2(id_reg2_o),
		.id_wd(id_wd_o),
		.id_wreg(id_wreg_o),
      
		//传递到执行阶段EX模块的信息
		.ex_aluop(ex_aluop_i),
		.ex_alusel(ex_alusel_i),
		.ex_reg1(ex_reg1_i),
		.ex_reg2(ex_reg2_i),
		.ex_wd(ex_wd_i),
		.ex_wreg(ex_wreg_i)
		);		
   
   //EX模块
   ex ex0(
	  .rst(rst),
      
	  //送到执行阶段EX模块的信息
	  .aluop_i(ex_aluop_i),
	  .alusel_i(ex_alusel_i),
	  .reg1_i(ex_reg1_i),
	  .reg2_i(ex_reg2_i),
	  .wd_i(ex_wd_i),
	  .wreg_i(ex_wreg_i),
      
	  //EX模块的输出到EX/MEM模块信息
	  .wd_o(ex_wd_o),
	  .wreg_o(ex_wreg_o),
	  .wdata_o(ex_wdata_o)
      
	  );

   //EX/MEM模块
   ex_mem ex_mem0(
		  .clk(clk),
		  .rst(rst),
      
		  //来自执行阶段EX模块的信息	
		  .ex_wd(ex_wd_o),
		  .ex_wreg(ex_wreg_o),
		  .ex_wdata(ex_wdata_o),
      

		  //送到访存阶段MEM模块的信息
		  .mem_wd(mem_wd_i),
		  .mem_wreg(mem_wreg_i),
		  .mem_wdata(mem_wdata_i)

      
		  );
   
   //MEM模块例化
   mem mem0(
	    .rst(rst),
      
	    //来自EX/MEM模块的信息	
	    .wd_i(mem_wd_i),
	    .wreg_i(mem_wreg_i),
	    .wdata_i(mem_wdata_i),
      
	    //送到MEM/WB模块的信息
	    .wd_o(mem_wd_o),
	    .wreg_o(mem_wreg_o),
	    .wdata_o(mem_wdata_o)
	    );

   //MEM/WB模块
   mem_wb mem_wb0(
		  .clk(clk),
		  .rst(rst),

		  //来自访存阶段MEM模块的信息	
		  .mem_wd(mem_wd_o),
		  .mem_wreg(mem_wreg_o),
		  .mem_wdata(mem_wdata_o),
      
		  //送到回写阶段的信息
		  .wb_wd(wb_wd_i),
		  .wb_wreg(wb_wreg_i),
		  .wb_wdata(wb_wdata_i)
      
		  );

   
endmodule // openmips