PROJECT.v.bak

/*
Copyright by Henry Ko and Nicola Nicolici
Developed for the Digital Systems Design course (COE3DQ4)
Department of Electrical and Computer Engineering
McMaster University
Ontario, Canada
*/

`timescale 1ns/100ps
`default_nettype none

`include "define_state.h"

// This is the top module
// It connects the SRAM and VGA together
// It will first write RGB data of an image with 8x8 rectangles of size 40x30 pixels into the SRAM
// The VGA will then read the SRAM and display the image
module PROJECT (
		/////// board clocks                      ////////////
		input logic CLOCK_50_I,                   // 50 MHz clock

		/////// pushbuttons/switches              ////////////
		input logic[3:0] PUSH_BUTTON_I,           // pushbuttons
		input logic[17:0] SWITCH_I,               // toggle switches


		/////// SRAM Interface                    ////////////
		inout wire[15:0] SRAM_DATA_IO,            // SRAM data bus 16 bits
		output logic[17:0] SRAM_ADDRESS_O,        // SRAM address bus 18 bits
		output logic SRAM_UB_N_O,                 // SRAM high-byte data mask 
		output logic SRAM_LB_N_O,                 // SRAM low-byte data mask 
		output logic SRAM_WE_N_O,                 // SRAM write enable
		output logic SRAM_CE_N_O,                 // SRAM chip enable
		output logic SRAM_OE_N_O                  // SRAM output logic enable
);

parameter NUM_ROW_RECTANGLE = 8,
		  NUM_COL_RECTANGLE = 8,
		  RECT_WIDTH = 40,
		  RECT_HEIGHT = 30,
		  VIEW_AREA_LEFT = 160,
		  VIEW_AREA_RIGHT = 480,
		  VIEW_AREA_TOP = 120,
		  VIEW_AREA_BOTTOM = 360;

state_type state;

// For Push button
logic [3:0] PB_pushed;


logic resetn;

// For SRAM
logic [17:0] SRAM_address;
logic [15:0] SRAM_write_data;
logic SRAM_we_n;
logic [15:0] SRAM_read_data;
logic SRAM_ready;

logic [2:0] rect_row_count;		// Number of rectangles in a row
logic [2:0] rect_col_count;		// Number of rectangles in a column
logic [5:0] rect_width_count;	// Width of each rectangle
logic [4:0] rect_height_count;	// Height of each rectangle
logic [2:0] color;



assign resetn = ~SWITCH_I[17] && SRAM_ready;

// Push Button unit
PB_Controller PB_unit (
	.Clock_50(CLOCK_50_I),
	.Resetn(resetn),
	.PB_signal(PUSH_BUTTON_I),	
	.PB_pushed(PB_pushed)
);

// SRAM unit
SRAM_Controller SRAM_unit (
	.Clock_50(CLOCK_50_I),
	.Resetn(~SWITCH_I[17]),
	.SRAM_address(SRAM_address),
	.SRAM_write_data(SRAM_write_data),
	.SRAM_we_n(SRAM_we_n),
	.SRAM_read_data(SRAM_read_data),		
	.SRAM_ready(SRAM_ready),
		
	// To the SRAM pins
	.SRAM_DATA_IO(SRAM_DATA_IO),
	.SRAM_ADDRESS_O(SRAM_ADDRESS_O),
	.SRAM_UB_N_O(SRAM_UB_N_O),
	.SRAM_LB_N_O(SRAM_LB_N_O),
	.SRAM_WE_N_O(SRAM_WE_N_O),
	.SRAM_CE_N_O(SRAM_CE_N_O),
	.SRAM_OE_N_O(SRAM_OE_N_O)
);


// Each rectangle will have different color
assign color = rect_col_count + rect_row_count;

always_ff @ (posedge CLOCK_50_I or negedge resetn) begin
	if (resetn == 1'b0) begin
		state <= S_IDLE;				
		
		SRAM_we_n <= 1'b1;
		SRAM_write_data <= 16'd0;
		SRAM_address <= 18'd0;
	end else begin
		case (state)
			
		default: state <= S_IDLE;
		endcase
	end
end

endmodule