Verilog GPIO

Verilog is a hardware description language used for designing digital systems. GPIO stands for General Purpose Input/Output, which refers to the pins on a microcontroller or FPGA that can be used for both input and output operations.

To implement GPIO functionality in Verilog, you can define a module that includes input and output ports corresponding to the GPIO pins. Here's an example of a simple Verilog module for GPIO:

module GPIO (
  input wire clk,
  input wire reset,
  input wire data_in,
  output wire data_out
);
  reg data_out_reg;

  always @(posedge clk or posedge reset) begin
    if (reset)
      data_out_reg <= 1'b0;
    else
      data_out_reg <= data_in;
  end

  assign data_out = data_out_reg;
endmodule

In this example, the module "GPIO" has four ports: "clk" for the clock signal, "reset" for the reset signal, "data_in" for the input data, and "data_out" for the output data. The "data_out_reg" register holds the value to be output.

The "always" block is used to describe the behavior of the module. In this case, it assigns the value of "data_in" to "data_out_reg" on every positive clock edge, except when the "reset" signal is asserted. The "assign" statement connects "data_out_reg" to the "data_out" output port.

This is just a basic example, and you can modify it according to your specific requirements or the target platform you are using.