///////////////////////////////////////////////////////////////////////
//
// cpu module
//
//    this is simply a shell representing the pad_ring
//    which instances cpu_core
//
///////////////////////////////////////////////////////////////////////

module test();

timeunit 1ns;
timeprecision 100ps;

wire [15:0] Data_in;
logic [15:0] Data_out;
wire [15:0] Data;
logic ENB, ME;
logic [15:0] Data_mem_drive;

//
// Simulation of bidirectional pads
//
assign Data = (ENB == 0) ? ~(~Data_out) : 16'bz;
assign Data_in = ~(~Data);

assign Data = (ME == 1) ? Data_mem_drive : 16'bz;

always
  begin
    Data_out = '0;
    #100
    Data_out = '1;
    #100
    Data_out = 'X;
    #100
    Data_out = 'Z;
    #100
    Data_out = '0;
  end

always
  begin
    Data_mem_drive = '0;
    #50
    Data_mem_drive = '1;
    #50
    Data_mem_drive = '0;
  end

always
  begin
    ENB = '0;
    ME = '0;
    #400
    ENB = '1;
    ME = '0;
    #400
    ME = '1;
    ENB = '1;
    #400
    ENB = '1;
  end

initial
  begin
    #1200
    $stop;
    $finish;
  end

initial
  begin
    #45 $display("%x %b%b %x %x", Data_out, ~ENB,ME, Data, Data_in);
    while (1) #50 $display("%x %b%b %x %x", Data_out, ~ENB,ME, Data, Data_in);
  end



endmodule