/* top.v - Implements FPGA and Board specific circuitry

   This file is part of the 9086 project.

   Copyright (c) 2023 Efthymios Kritikos

   This program is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

`include "error_header.v"

module fpga_top(
	input clk48,

	input user_button,
//	output reset_n,

	output rgb_led0_r,
	output rgb_led0_g,
	output rgb_led0_b,
);

wire HALT;
wire [`ERROR_BITS-1:0]ERROR;
wire [19:0] address_bus;
wire [15:0] data_bus_read,data_bus_write;
wire rd,wr,BHE,IOMEM;
system system(
	/*     MISC    */ clk48,user_button
	/* MEMORY / IO */ ,address_bus,data_bus_read,data_bus_write,BHE,rd,wr,IOMEM,HALT,ERROR
);

reg [2:0]rgb_led_color;
assign rgb_led0_r=rgb_led_color[0];
assign rgb_led0_g=rgb_led_color[1];
assign rgb_led0_b=rgb_led_color[2];

always @(HALT or ERROR or user_button) begin
	if (HALT==0) begin
		/* yellow */
		rgb_led_color<=3'b100;
	end else if (ERROR != `ERROR_BITS'b0) begin
		/* red */
		rgb_led_color<=3'b110;
	end else begin
		/* green */
		rgb_led_color<=3'b101;
	end
end

endmodule