module generate_example();

reg read,write = 0;
reg [31:0] data_in  = 0;
reg [3:0] address = 0;
wire [31:0] data_out;

initial begin
  $monitor ("%g read=%b write=%b address=%b data_in=%h data_out=%h",
    $time, read, write, address, data_in, data_out);
  #1 read = 0; // why only for read
  #3 repeat (16) begin
    data_in = $random;
    write = 1;
    #1 address = address + 1;
  end
  write = 0;
  address = 0;
  #3 repeat (16) begin
    read = 1;
    #1 address = address + 1;
  end
  read = 0;
  #1 $finish;
end  

genvar i;

generate
  for (i=0; i < 4; i=i+1) begin : MEM
     memory U (read, write, 
               data_in[(i*8)+7:(i*8)], 
               address,data_out[(i*8)+7:(i*8)]);
  end
endgenerate

endmodule

// Lower module that will be connected muliple times
module memory (
  input wire read,
  input wire write,
  input wire [7:0] data_in,
  input wire [3:0] address,
  output reg [7:0] data_out
);

reg [7:0] mem [0:15];

always @ (*)
begin
  if (write) mem[address] = data_in;
end

always @ (read, address)
begin
  if (read) data_out = mem[address];
end

endmodule