verilog初始化ps2键盘代码

以下是一个简单的Verilog代码，用于初始化PS2键盘：

module ps2_init (
  input clk,
  input reset,
  input ps2_data,
  output reg ps2_init_done
);

reg [7:0] ps2_byte;
reg ps2_clk;
reg ps2_clk_edge;
reg ps2_init_state;

parameter IDLE = 1'b0;
parameter SEND_RESET = 1'b1;
parameter WAIT_FOR_ACK = 1'b2;
parameter RESEND_RESET = 1'b3;
parameter WAIT_FOR_INIT_DONE = 1'b4;

always @(posedge clk) begin
  if (reset) begin
    ps2_byte <= 8'h00;
    ps2_clk <= 1'b0;
    ps2_clk_edge <= 1'b0;
    ps2_init_done <= 1'b0;
    ps2_init_state <= IDLE;
  end else begin
    case (ps2_init_state)
      IDLE: begin
        ps2_byte <= 8'hF0;
        ps2_clk <= 1'b0;
        ps2_clk_edge <= 1'b0;
        ps2_init_state <= SEND_RESET;
      end
      SEND_RESET: begin
        ps2_data <= 1'b0;
        ps2_clk <= ~ps2_clk;
        ps2_clk_edge <= ps2_clk;
        if (ps2_clk_edge) begin
          ps2_byte <= ps2_byte >> 1;
        end
        if (ps2_byte == 8'h00) begin
          ps2_init_state <= WAIT_FOR_ACK;
        end
      end
      WAIT_FOR_ACK: begin
        ps2_clk <= ~ps2_clk;
        ps2_clk_edge <= ps2_clk;
        if (ps2_clk_edge) begin
          if (ps2_data) begin
            ps2_init_state <= RESEND_RESET;
          end else begin
            ps2_byte <= 8'hF3;
            ps2_init_state <= WAIT_FOR_INIT_DONE;
          end
        end
      end
      RESEND_RESET: begin
        ps2_byte <= 8'h00;
        ps2_clk <= 1'b0;
        ps2_clk_edge <= 1'b0;
        ps2_init_state <= SEND_RESET;
      end
      WAIT_FOR_INIT_DONE: begin
        ps2_clk <= ~ps2_clk;
        ps2_clk_edge <= ps2_clk;
        if (ps2_clk_edge) begin
          if (ps2_data) begin
            ps2_init_done <= 1'b1;
          end
        end
      end
    endcase
  end
end

endmodule

该代码使用有限状态机（FSM）来控制PS2键盘的初始化。在FSM的不同状态之间切换，根据当前状态和PS2数据线上的信号进行决策并设置下一状态。在初始化完成后，输出 `ps2_init_done` 信号。