module chip8 (
    input wire fpga_clk,
    input wire rst_in,
    output logic lcd_clk, 
    output logic lcd_data,
    output logic [5:0] led,
    input wire [3:0] row,
    output logic [3:0] col
);
logic slow_clk;
`ifdef FAST_CLK
    assign slow_clk = fpga_clk;
`endif

`ifndef FAST_CLK
    downclocker #(10) dc(fpga_clk, slow_clk);
`endif

  logic key_clk;
  downclocker #(24) dck(fpga_clk, key_clk);

  logic [7:0] rd_memory_data;
  logic [11:0] rd_memory_address;
  logic [11:0] wr_memory_address;
  logic [7:0] wr_memory_data;
  logic wr_go;
  memory #(4096) mem (
        slow_clk,
        wr_go,
        wr_memory_address,
        wr_memory_data,
        rd_memory_address,
        rd_memory_data
      );

  keypad keypad(
        key_clk,
        row,
        col,
        led
      );
  
  int cycle_counter;
  logic [5:0] nc;
  cpu cpu (
      slow_clk,
      fpga_clk,
      rd_memory_data,
      cycle_counter,
      rd_memory_address,
      wr_memory_address,
      wr_memory_data,
      wr_go,
      lcd_clk,
      lcd_data,
      nc
  );

endmodule