iic eeprom verilog

您好！您的问题是关于 iic eeprom 的 Verilog 实现，对吗？那么，以下是一个简单的 iic eeprom 的 Verilog 代码示例，供您参考：

module iic_eeprom(
  input wire clk,
  input wire rst,
  input wire sda,
  input wire scl,
  input wire [7:0] addr,
  input wire [7:0] data_in,
  output wire [7:0] data_out,
  output wire ack,
  output wire done
);

  reg [7:0] mem [0:255];
  reg [7:0] rdata;
  reg [7:0] wdata;
  reg [7:0] cnt;
  reg [7:0] addr_reg;
  reg [2:0] state;
  reg sda_reg;
  reg scl_reg;
  wire ack_reg;

  /* IIC state machine */
  parameter IDLE = 0, START = 1, ADDR = 2, DATA_IN = 3, DATA_OUT = 4, STOP = 5;
  always @(posedge clk) begin
    if (rst) begin
      state <= IDLE;
      cnt <= 0;
      sda_reg <= 1;
      scl_reg <= 1;
    end else begin
      case (state)
        IDLE:
          if (!scl && sda) begin
            state <= START;
          end
        START:
          sda_reg <= 0;
          scl_reg <= 0;
          if (cnt == 7) begin
            state <= ADDR;
            cnt <= 0;
            addr_reg <= addr;
          end else begin
            cnt <= cnt + 1;
          end
        ADDR:
          sda_reg <= addr_reg[cnt];
          if (cnt == 7) begin
            state <= DATA_IN;
            cnt <= 0;
            wdata <= data_in;
          end else begin
            cnt <= cnt + 1;
          end
        DATA_IN:
          sda_reg <= wdata[cnt];
          if (cnt == 7) begin
            state <= ADDR;
            cnt <= 0;
            addr_reg <= addr;
            ack <= 1;
          end else begin
            cnt <= cnt + 1;
          end
        DATA_OUT:
          sda_reg <= rdata[cnt];
          if (cnt == 7) begin
            state <= STOP;
            cnt <= 0;
          end else begin
            cnt <= cnt + 1;
          end
        STOP:
          sda_reg <= 1;
          scl_reg <= 1;
          state <= IDLE;
      endcase
    end
  end

  /* IIC controller */
  iic_controller iic_controller_inst(
    .clk(clk),
    .sda(sda),
    .scl(scl),
    .sda_reg(sda_reg),
    .scl_reg(scl_reg),
    .ack_reg(ack_reg)
  );

  /* IIC controller to read/write eeprom */
  assign done = (state == STOP);
  always @(posedge clk) begin
    if (ack_reg) begin
      case (state)
        ADDR:
          state <= DATA_OUT;
          cnt <= 0;
        DATA_IN:
          state <= STOP;
          cnt <= 0;
        DATA_OUT:
          rdata <= sda;
          if (cnt == 7) begin
            state <= START;
            cnt <= 0;
          end else begin
            cnt <= cnt + 1;
          end
      endcase
    end
  end

  /* eeprom memory */
  always @(posedge clk) begin
    if (state == DATA_IN) begin
      mem[addr_reg] <= wdata;
    end
    if (state == DATA_OUT) begin
      data_out <= mem[addr_reg];
    end
  end

endmodule

/* IIC controller */
module iic_controller(
  input wire clk,
  input wire sda,
  input wire scl,
  input wire sda_reg,
  input wire scl_reg,
  output wire ack_reg
);

  reg sda_int;
  reg scl_int;

  always @(posedge clk) begin
    sda_int <= sda_reg;
    scl_int <= scl_reg;
  end

  assign ack_reg = (!sda && !scl);

  assign sda = sda_int;
  assign scl = scl_int;

endmodule

这个代码示例实现了一个简单的 iic eeprom，包括 iic 态机、iic 控制器、eeprom 存储器等功能。您可以根据自己的需求进行修改和优化。希望对您有所帮助！