//-----------------------------------------------------
// This file includes behavorial modeling 
// for digital I/O cells
// These cells may not be directly used for physical design
// Synthesis tools may be needed
//-----------------------------------------------------
`timescale 1ns/1ps

//-----------------------------------------------------
// Function    : A minimum input pad
//-----------------------------------------------------
module GPIN (
  inout A, // External PAD signal
  output Y // Data input
);
  assign Y = A;
endmodule

//-----------------------------------------------------
// Function    : A minimum output pad
//-----------------------------------------------------
module GPOUT (
  inout Y, // External PAD signal
  input A // Data output
);
  assign Y = A;
endmodule

//-----------------------------------------------------
// Function    : A minimum embedded I/O
//               just an overlay to interface other components
//-----------------------------------------------------
module EMBEDDED_IO (
  input SOC_IN, // Input to drive the inpad signal
  output SOC_OUT, // Output the outpad signal
  output SOC_DIR, // Output the directionality
  output FPGA_IN, // Input data to FPGA
  input FPGA_OUT, // Output data from FPGA
  input FPGA_DIR // direction control 
);

  assign FPGA_IN = SOC_IN;
  assign SOC_OUT = FPGA_OUT;
  assign SOC_DIR = FPGA_DIR;
endmodule