fpga组合逻辑控制输出20个io口高低电平代码

下面给出一个简单的FPGA组合逻辑控制输出20个IO口高低电平的代码，其中使用了Verilog语言实现：

module io_ctrl(
  input clk,
  input [19:0] io_ctrl_data,
  output reg [19:0] io_out
);

always @(posedge clk) begin
  io_out[0] <= io_ctrl_data[0];
  io_out[1] <= io_ctrl_data[1];
  io_out[2] <= io_ctrl_data[2];
  io_out[3] <= io_ctrl_data[3];
  io_out[4] <= io_ctrl_data[4];
  io_out[5] <= io_ctrl_data[5];
  io_out[6] <= io_ctrl_data[6];
  io_out[7] <= io_ctrl_data[7];
  io_out[8] <= io_ctrl_data[8];
  io_out[9] <= io_ctrl_data[9];
  io_out[10] <= io_ctrl_data[10];
  io_out[11] <= io_ctrl_data[11];
  io_out[12] <= io_ctrl_data[12];
  io_out[13] <= io_ctrl_data[13];
  io_out[14] <= io_ctrl_data[14];
  io_out[15] <= io_ctrl_data[15];
  io_out[16] <= io_ctrl_data[16];
  io_out[17] <= io_ctrl_data[17];
  io_out[18] <= io_ctrl_data[18];
  io_out[19] <= io_ctrl_data[19];
end

endmodule

上述代码中，模块`io_ctrl`包含了一个时钟信号`clk`、一个20位的输入端口`io_ctrl_data`和一个20位的输出端口`io_out`。在时钟上升沿的时候，将输入端口`io_ctrl_data`的每一位分别赋值给输出端口`io_out`的对应位，实现了对20个IO口的控制。