为下面代码逐句写注释详细标注每一行变量的名称 input clkstart;时钟信号开始信号 定义各个输出端口 output MemWrMemWr2MemtoRegimm16overflow; output40 rdrsrtrw2; output310 busAbusBresultinstructionDataOut; 定义各个中间变量 wire zerooutZeroov

//定义时钟信号和开始信号的输入端口 input clk, start;

//定义各个输出端口 output MemWr, MemWr2, MemtoReg, imm16, overflow; output [4:0] rd, rs, rt, rw2; output [31:0] busA, busB, result, instruction, DataOut;

//定义各个中间变量 wire zero, outZero, overflow, overflow2, outOverflow, jump2, jump, outjump, reset; wire [31:0] instruction, outInstruction, pc1, pc2, outPc1; wire [5:0] op, func, outFunc; wire [4:0] rd, rs, rt, rw, outRs, outRt, outRd, outRw, shamt; wire [15:0] imm16, outImm16; wire [25:0] target, outTarget; wire branch, RegDst, ALUSrc, ALUSrc2, MemtoReg, RegWr, MemWr, ExtOP, outBranch, outJump, outRegDst, outALUSrc, outMemtoReg, outRegWr, outMemWr, outExtOP, MemWr2, Branch2, MemtoReg2, RegWr2, outMemtoReg2, outRegWr2; wire [2:0] ALUCtrl, outALUCtrl; wire [31:0] busA, busB, busW, outBusA, outBusB, busB2, ALUout, outALUout, ALUout2, addr, outAddr, DataOut, outDataout, result, A, B, PC, pc3;

//定义各个输出端口 output [31:0] A, B, ALUout, outALUout, addr, outpc3, PC, pc1, outDataout; output [2:0] ALUCtrl; output [1:0] ALUSrcA, ALUSrcB; output jump, outMemtoReg2, Branch2, zero, outTarget, pc3, reset