tachibana/src/top.v

module proc_top(
	input clk,
	
	input sck, sdi, ncs,
	output sdo,
	
    input in_blank, in_hsync, in_vsync,
	input [7:0] in_red,
	input [7:0] in_green,
	input [7:0] in_blue,
	input is_interlaced, is_second_field,
	
	output out_blank, out_hsync, out_vsync,
	output [7:0] out_red,
	output [7:0] out_green,
	output [7:0] out_blue,
	
	input [7:0] switches
);

/* ================= */
/* DEBUG DEBUG DEBUG */
/* ================= */

/* Color bar generator */

parameter CB_HRES = 1280;
parameter CB_VRES = 720;
parameter CB_H_FP = 68;
parameter CB_H_BP = 300;
parameter CB_V_FP = 25;
parameter CB_V_BP = 5;

reg [11:0] cb_x = 0;
reg [11:0] cb_y = 0;
reg [11:0] cb_cnt = 0;
reg [5:0] cb_bar = 0;

reg cb_hsync = 0, cb_vsync = 0, cb_blank = 1, cb_vactive = 0;
reg [7:0] cb_red;
reg [7:0] cb_green;
reg [7:0] cb_blue;

assign out_hsync = cb_hsync;
assign out_vsync = cb_vsync;
assign out_blank = cb_blank;
assign out_red = cb_red;
assign out_green = cb_green;
assign out_blue = cb_blue;

always @(posedge clk) begin
	cb_x <= cb_x + 1;
	
	cb_hsync <= cb_x >= 8 && cb_x <= 15;
	cb_vsync <= cb_y >= 4 && cb_y <= 7;
	
	if (cb_x == CB_H_FP + CB_HRES + CB_H_BP - 1) begin
		cb_x <= 0;
		cb_y <= cb_y + 1;
		
		
		if (cb_y == CB_V_FP - 1) begin
			cb_vactive <= 1;
			
		end else if (cb_y == CB_V_FP + CB_VRES - 1) begin
			cb_vactive <= 0;
			
		end else if (cb_y == CB_V_FP + CB_VRES + CB_V_BP - 1) begin
			cb_y <= 0;
		end
		
	end else if (cb_vactive && (cb_x == CB_H_FP - 1)) begin
		cb_red   <= 0;
		cb_green <= 0;
		cb_blue  <= 0;
		cb_blank <= 0;
		
	end else if (cb_vactive && (cb_x == CB_H_FP + CB_HRES - 1)) begin
		cb_blank <= 1;
		cb_cnt <= 0;
		cb_bar <= 0;
		
	end
	
	if (!cb_blank) begin
		cb_cnt <= cb_cnt + 1;
		
		if (cb_cnt == 127) begin
			cb_cnt <= 0;
			cb_bar <= cb_bar + 1;
			
			if (cb_bar == 7) begin
				cb_bar <= 0;
			end
		end
	end
	
	if (cb_y < CB_V_FP + 30 || cb_y > CB_V_FP + CB_VRES - 30) begin
		cb_red   <= {8{cb_bar[0]}};
		cb_green <= {8{cb_bar[1]}};
		cb_blue  <= {8{cb_bar[2]}};
		
	end else begin
		cb_red   <= in_red;
		cb_green <= in_green;
		cb_blue  <= in_blue;
	end
end

/* ================= */
/*   END DEBUG END   */
/* ================= */

parameter GLYPHMEM_W = 256; /* glyphs */
parameter GLYPHMEM_H = 128; /* glyphs */
parameter PAYLOAD_BUF_SIZE = 16384;

reg rst = 0;
reg [3:0] rst_cnt = 0;

always @(posedge clk) begin
	if (rst_cnt != 0) begin
		rst <= 1;
	end
	
	if (rst_cnt != 4'hf) begin
		rst_cnt <= rst_cnt + 1;
	end else begin
		rst <= 0;
	end
end

reg input_idle = 0;
reg [19:0] idle_cnt = 0;
always @(posedge clk) begin
	if (in_vsync) begin
		idle_cnt <= 0;
		input_idle <= 0;
		
	end else begin
		if (idle_cnt == 20'hfffff) begin
			input_idle <= 1;
			
		end else begin
			idle_cnt <= idle_cnt + 1;
		end
	end
end

/* Switches */
wire bypass = switches[0];

/* spi interface */
reg [7:0] spi_data_in;
wire [7:0] spi_data_out;
wire win_locked;
wire [7:0] spi_status_word = {5'h00, bypass, win_locked, input_idle};
wire [7:0] spi_cmd_word;
wire spi_cmd_begin, spi_cmd_active, spi_cmd_step;
wire [19:0] spi_cmd_idx;

/* term emu */
wire temu_in_valid = (spi_cmd_word == 8'h23) && spi_cmd_step;
wire glyph_buffer_w_valid;
wire [15:0] glyph_buffer_w_addr;
wire [19:0] glyph_buffer_w_data;

/* matcher */
wire win_hsync;
wire win_vsync;
wire win_blank;
wire [11:0] win_w;
wire [11:0] win_h;
wire out_data_en;
wire out_data_valid;
wire [23:0] out_data;

/* term renderer */
wire [7:0] win_red;
wire [7:0] win_green;
wire [7:0] win_blue;

/* spi read index logic */
reg [15:0] spi_payload_r_idx;
reg [1:0] spi_payload_byte;
always @(posedge clk) begin
	if (spi_cmd_begin) begin
		spi_payload_r_idx <= 0;
		spi_payload_byte <= 0;
	end else if (spi_cmd_step) begin
		if (spi_payload_byte == 2) begin
			spi_payload_r_idx <= spi_payload_r_idx + 1;
			spi_payload_byte <= 0;
			
		end else begin
			spi_payload_byte <= spi_payload_byte + 1;
		end
	end
end

/* payload buffer access logic */
reg [23:0] payload_buf [0:PAYLOAD_BUF_SIZE-1];
reg out_data_en_last;
reg [15:0] payload_w_idx;
reg [23:0] payload_r_data;
always @(posedge clk) begin
	out_data_en_last <= out_data_en;
	
	if (!out_data_en) begin
		payload_w_idx <= 0;
	end
	
	if (out_data_valid) begin
		payload_buf[payload_w_idx] <= out_data;
		payload_w_idx <= payload_w_idx + 1;
	end
	
	payload_r_data <= payload_buf[spi_payload_r_idx];
end

/* SPI read payload memory access logic */
always @(posedge clk) begin
	if (spi_cmd_active && (spi_cmd_word == 8'h22)) begin
		case (spi_payload_byte)
		0: spi_data_in <= payload_r_data[23:16];
		1: spi_data_in <= payload_r_data[15:8];
		default: spi_data_in <= payload_r_data[7:0];
		endcase
	end
end

/* glyph memory logic */
reg [19:0] glyphmem [0:GLYPHMEM_W*GLYPHMEM_H-1];
reg [19:0] glyphmem_r_data;
always @(posedge clk) begin
	if (glyph_buffer_w_valid) begin
		glyphmem[glyph_buffer_w_addr] <= glyph_buffer_w_data;
	end
	
	glyphmem_r_data <= glyphmem[glyphmem_r_addr];
end

spi_regfile spi_regfile_dut (
	.clk(clk), .rst(rst),
	
	.sck(sck), .sdi(sdi), .sdo(sdo), .ncs(ncs),
	
	.spi_data_in(spi_data_in),
	.spi_data_out(spi_data_out),
	
	.spi_status_word(spi_status_word),
	.spi_cmd_word(spi_cmd_word),
	.spi_cmd_begin(spi_cmd_begin),
	.spi_cmd_active(spi_cmd_active),
	.spi_cmd_step(spi_cmd_step),
	.spi_cmd_idx(spi_cmd_idx)
);

term_emu #(
	.GLYPHMEM_W(GLYPHMEM_W),
	.GLYPHMEM_H(GLYPHMEM_H)
) term_emu_i (
	.clk(clk), .rst(rst),
	
	.in_byte_valid(temu_in_valid),
	.in_byte(spi_data_out),
	.in_byte_ack(),
	
	.glyph_buffer_w_valid(glyph_buffer_w_valid),
	.glyph_buffer_w_addr(glyph_buffer_w_addr),
	.glyph_buffer_w_data(glyph_buffer_w_data)
);

term_renderer #(
	.GLYPHMEM_W(GLYPHMEM_W),
	.GLYPHMEM_H(GLYPHMEM_H)
	) term_renderer_i (
	.rst(rst),
	.clk(clk),
	
	.in_vsync(win_vsync),
	.in_hsync(win_hsync),
	
	.glyphmem_data(glyphmem_r_data),
	.glyphmem_r_addr(glyphmem_r_addr),
	
	.out_red(win_red),
	.out_green(win_green),
	.out_blue(win_blue)
);

window_matcher window_matcher_i (
    .clk(clk),
    .rst(rst),
	
	.bypass(bypass),
    
    .in_blank(in_blank),
    .in_hsync(in_hsync),
    .in_vsync(in_vsync),
    .in_red(in_red),
    .in_green(in_green),
    .in_blue(in_blue),
    
    .win_hsync(win_hsync),
    .win_vsync(win_vsync),
    .win_blank(win_blank),
	.win_locked(win_locked),
	.win_w(win_w),
	.win_h(win_h),
    
    .out_data_en(out_data_en),
    .out_data_valid(out_data_valid),
    .out_data(out_data),
	
	.win_red(win_red),
	.win_green(win_green),
	.win_blue(win_blue),
	
    .out_blank(), // out_blank),
    .out_hsync(), //out_hsync),
	.out_vsync(), //out_vsync),
    .out_red(), //out_red),
	.out_green(), //out_green),
	.out_blue() //out_blue)
    );

endmodule