用verilog设计I2C TO AHB接口模块

好的，我了解到你需要用verilog设计一个I2C到AHB接口模块。下面是一个简单的示例代码：

module i2c_ahb_interface (
  input clk,
  input reset,
  input i2c_sda,
  input i2c_scl,
  input [31:0] i2c_addr,
  input [31:0] i2c_data_in,
  output reg [31:0] i2c_data_out,
  output reg i2c_ack,
  output reg ahb_hsel,
  output reg ahb_htrans,
  output reg ahb_hwrite,
  output reg ahb_hrdata,
  output reg ahb_hready
);

  // I2C interface signals
  reg [7:0] i2c_state;
  reg [7:0] i2c_reg_addr;
  reg [31:0] i2c_reg_data;
  reg i2c_rw_bit;
  reg i2c_req;
  reg i2c_ack_bit;

  // AHB interface signals
  reg [31:0] ahb_addr;
  reg [31:0] ahb_data_out;
  reg [31:0] ahb_data_in;
  reg ahb_sel;
  reg ahb_trans;
  reg ahb_write;
  reg ahb_ready;

  // Internal registers
  reg [31:0] reg_data_in;
  reg [31:0] reg_data_out;
  reg [31:0] reg_addr;
  reg ack;

  // State machine
  localparam IDLE = 8'h00;
  localparam START = 8'h01;
  localparam ADDR = 8'h02;
  localparam WRITE = 8'h03;
  localparam READ = 8'h04;

  always @(posedge clk) begin
    if (reset) begin
      i2c_state <= IDLE;
      i2c_reg_addr <= 0;
      i2c_reg_data <= 0;
      i2c_rw_bit <= 0;
      i2c_req <= 0;
      i2c_ack_bit <= 0;
      ahb_addr <= 0;
      ahb_data_out <= 0;
      ahb_data_in <= 0;
      ahb_sel <= 0;
      ahb_trans <= 0;
      ahb_write <= 0;
      ahb_ready <= 0;
      reg_data_in <= 0;
      reg_data_out <= 0;
      reg_addr <= 0;
      ack <= 0;
    end else begin
      case (i2c_state)
        IDLE: begin
          if (i2c_req) begin
            i2c_state <= START;
          end
        end
        START: begin
          i2c_sda <= 0;
          i2c_scl <= 0;
          i2c_state <= ADDR;
        end
        ADDR: begin
          case (i2c_rw_bit)
            0: begin // Write
              i2c_reg_addr <= i2c_addr[7:1];
            end
            1: begin // Read
              i2c_reg_addr <= i2c_addr[7:1] | 1;
            end
          endcase
          i2c_sda <= i2c_reg_addr[7];
          i2c_scl <= 1;
          i2c_reg_addr <= i2c_reg_addr << 1;
          if (i2c_reg_addr == 0) begin
            i2c_state <= (i2c_rw_bit) ? READ : WRITE;
          end
        end
        WRITE: begin
          case (i2c_reg_addr)
            0: begin
              reg_addr <= i2c_data_in;
              i2c_ack_bit <= 1;
            end
            4: begin
              reg_data_in <= i2c_data_in;
              i2c_ack_bit <= 1;
            end
          endcase
          i2c_scl <= 0;
          i2c_sda <= i2c_ack_bit;
          if (i2c_ack_bit == 0) begin
            i2c_reg_addr <= i2c_reg_addr + 1;
          end
          if (i2c_reg_addr == 8) begin
            ahb_sel <= 1;
            ahb_trans <= 1;
            ahb_write <= 1;
            ahb_addr <= reg_addr;
            ahb_data_out <= reg_data_in;
            i2c_state <= IDLE;
            i2c_ack_bit <= 0;
          end
        end
        READ: begin
          case (i2c_reg_addr)
            0: begin
              reg_addr <= i2c_data_in;
              i2c_ack_bit <= 1;
            end
          endcase
          i2c_scl <= 0;
          i2c_sda <= i2c_ack_bit;
          if (i2c_ack_bit == 0) begin
            i2c_reg_addr <= i2c_reg_addr + 1;
          end
          if (i2c_reg_addr == 8) begin
            ahb_sel <= 1;
            ahb_trans <= 1;
            ahb_write <= 0;
            ahb_addr <= reg_addr;
            ahb_data_out <= 0;
            i2c_state <= READ;
            i2c_ack_bit <= 0;
          end
          if (ack) begin
            i2c_data_out <= ahb_data_in;
            i2c_ack_bit <= 1;
            i2c_state <= IDLE;
          end
        end
      endcase
    end
  end

  always @(posedge clk) begin
    if (reset) begin
      ahb_hsel <= 0;
      ahb_htrans <= 0;
      ahb_hwrite <= 0;
      ahb_hrdata <= 0;
      ahb_hready <= 0;
    end else begin
      ahb_hsel <= ahb_sel;
      ahb_htrans <= ahb_trans;
      ahb_hwrite <= ahb_write;
      ahb_hrdata <= ahb_data_in;
      ahb_ready <= 1;
      if (ahb_sel && ahb_trans && !ahb_write) begin
        ack <= 1;
      end
    end
  end

endmodule

请注意，这只是一个简单的示例代码，仅供参考。实际的设计可能需要更多的信号和状态机来支持更复杂的操作。同时，还需要根据具体的I2C和AHB规范进行设计。