verilog设计一个基于risc-Ⅴ的五级流水线cpu，要求满足30条指令，具体到代码

好的，以下是基于risc-Ⅴ的五级流水线cpu的Verilog代码，可以实现30条指令的操作。由于篇幅较长，我将代码拆分成了多个模块，分别实现了取指阶段、译码阶段、执行阶段、访存阶段和写回阶段。

1. 指令存储器模块

module instruction_memory(
  input [31:0] address,
  output reg [31:0] instruction
);

  // 定义指令存储器，存储30条指令
  reg [31:0] memory [0:29] = {
    32'h00000013, // addi x1, x0, 19
    32'h00000093, // addi x3, x0, 0
    32'h00000113, // addi x2, x0, 0
    32'h000001b3, // addi x3, x3, 1
    32'h00c28293, // addi x5, x5, 12
    32'h00c20293, // addi x5, x5, -12
    32'h00020313, // addi x6, x0, 3
    32'h01030333, // add x6, x6, x3
    32'h01030333, // add x6, x6, x3
    32'h01030333, // add x6, x6, x3
    32'h01030333, // add x6, x6, x3
    32'h01030333, // add x6, x6, x3
    32'h01030333, // add x6, x6, x3
    32'h01030333, // add x6, x6, x3
    32'h01030333, // add x6, x6, x3
    32'h01030333, // add x6, x6, x3
    32'h01030333, // add x6, x6, x3
    32'h01030333, // add x6, x6, x3
    32'h01030333, // add x6, x6, x3
    32'h01030333, // add x6, x6, x3
    32'h01030333, // add x6, x6, x3
    32'h01030333, // add x6, x6, x3
    32'h01030333, // add x6, x6, x3
    32'h01030333, // add x6, x6, x3
    32'h01030333, // add x6, x6, x3
    32'h01030333, // add x6, x6, x3
    32'h01030333, // add x6, x6, x3
    32'h01030333, // add x6, x6, x3
    32'h01030333, // add x6, x6, x3
    32'h01030333, // add x6, x6, x3
    32'h01030333  // add x6, x6, x3
  };

  always @* begin
    instruction = memory[address >> 2];
  end

endmodule

2. 寄存器堆模块

module register_file(
  input [4:0] read_register_1,
  input [4:0] read_register_2,
  input [4:0] write_register,
  input [31:0] write_data,
  input write_enable,
  output reg [31:0] read_data_1,
  output reg [31:0] read_data_2
);

  // 定义32个32位寄存器
  reg [31:0] registers [0:31];

  always @* begin
    read_data_1 = registers[read_register_1];
    read_data_2 = registers[read_register_2];

    if (write_enable) begin
      registers[write_register] = write_data;
    end
  end

endmodule

3. 取指阶段模块

module fetch_stage(
  input clk,
  input reset,
  input [31:0] pc_in,
  output reg [31:0] pc_out,
  output reg [31:0] instruction
);

  // 定义指令存储器
  instruction_memory im(
    .address(pc_in),
    .instruction(instruction)
  );

  always @(posedge clk) begin
    if (reset) begin
      pc_out <= 32'h00000000;
    end else begin
      pc_out <= pc_in + 4;
    end
  end

endmodule

4. 译码阶段模块

module decode_stage(
  input [31:0] instruction,
  input [31:0] pc,
  input [4:0] read_register_1,
  input [4:0] read_register_2,
  output [4:0] write_register,
  output [31:0] write_data,
  output reg [31:0] immediate,
  output reg [6:0] opcode,
  output reg [2:0] funct3,
  output reg [6:0] funct7,
  output reg reg_write_enable
);

  always @* begin
    opcode = instruction[6:0];
    funct3 = instruction[14:12];
    funct7 = instruction[31:25];

    case (opcode)
      // addi
      7'h13: begin
        write_register = instruction[11:7];
        immediate = {{20{instruction[31]}}, instruction[31:20]};
        write_data = immediate + 32'h00000000;
        reg_write_enable = 1;
      end
      // add
      7'h33: begin
        write_register = instruction[11:7];
        write_data = read_data_1 + read_data_2;
        reg_write_enable = 1;
      end
      // sub
      7'h23: begin
        write_register = instruction[11:7];
        write_data = read_data_1 - read_data_2;
        reg_write_enable = 1;
      end
      // and
      7'h13: begin
        write_register = instruction[11:7];
        write_data = read_data_1 & read_data_2;
        reg_write_enable = 1;
      end
      // or
      7'h33: begin
        write_register = instruction[11:7];
        write_data = read_data_1 | read_data_2;
        reg_write_enable = 1;
      end
      // xor
      7'h13: begin
        write_register = instruction[11:7];
        write_data = read_data_1 ^ read_data_2;
        reg_write_enable = 1;
      end
      // sll
      7'h33: begin
        write_register = instruction[11:7];
        write_data = read_data_1 << read_data_2[4:0];
        reg_write_enable = 1;
      end
      // srl
      7'h33: begin
        write_register = instruction[11:7];
        write_data = read_data_1 >> read_data_2[4:0];
        reg_write_enable = 1;
      end
      // sra
      7'h33: begin
        write_register = instruction[11:7];
        write_data = $signed(read_data_1) >>> read_data_2[4:0];
        reg_write_enable = 1;
      end
      // mul
      7'h33: begin
        write_register = instruction[11:7];
        write_data = read_data_1 * read_data_2;
        reg_write_enable = 1;
      end
      // div
      7'h33: begin
        write_register = instruction[11:7];
        write_data = read_data_1 / read_data_2;
        reg_write_enable = 1;
      end
      // lb
      7'h03: begin
        write_register = instruction[11:7];
        immediate = {{24{instruction[31]}}, instruction[31:20]};
        write_data = $signed({immediate, {24{1'b0}}}) + read_data_1;
        reg_write_enable = 1;
      end
      // lh
      7'h03: begin
        write_register = instruction[11:7];
        immediate = {{20{instruction[31]}}, instruction[31:20]};
        write_data = $signed({immediate, {16{1'b0}}}) + read_data_1;
        reg_write_enable = 1;
      end
      // lw
      7'h03: begin
        write_register = instruction[11:7];
        immediate = {{20{instruction[31]}}, instruction[31:20]};
        write_data = $signed(immediate) + read_data_1;
        reg_write_enable = 1;
      end
      // sb
      7'h23: begin
        immediate = {{20{instruction[31]}}, instruction[31:25], instruction[11:7]};
        write_data = read_data_2[7:0];
        reg_write_enable = 0;
      end
      // sh
      7'h23: begin
        immediate = {{20{instruction[31]}}, instruction[31:25], instruction[11:7]};
        write_data = read_data_2[15:0];
        reg_write_enable = 0;
      end
      // sw
      7'h23: begin
        immediate = {{20{instruction[31]}}, instruction[31:25], instruction[11:7]};
        write_data = read_data_2;
        reg_write_enable = 0;
      end
      // beq
      7'h63: begin
        if (read_data_1 == read_data_2) begin
          immediate = {{19{instruction[31]}}, instruction[31], instruction[7], instruction[30:25], instruction[11:8], 1'b0};
          pc_out = pc + immediate;
        end
        reg_write_enable = 0;
      end
      // bne
      7'h63: begin
        if (read_data