// This module fetches video data from DRAM

module video_fetch
(
	// clocks
	input wire clk,

	// control
	input wire [3:0] f_sel,
	input wire [1:0] b_sel,
	input wire fetch_stb,

	// video data
	output reg [31:0] fetch_data,
	output reg [31:0] fetch_temp,

	// DRAM interface
	input  wire        video_strobe,
	input  wire [15:0] video_data
);

// fetching data
always @(posedge clk) if (video_strobe)
begin
	if (f_sel[0]) fetch_temp[ 7: 0] <= b_sel[0] ? video_data[15:8] : video_data[ 7:0];
	if (f_sel[1]) fetch_temp[15: 8] <= b_sel[1] ? video_data[15:8] : video_data[ 7:0];
	if (f_sel[2]) fetch_temp[23:16] <= video_data[ 7:0];
	if (f_sel[3]) fetch_temp[31:24] <= video_data[15:8];
end

always @(posedge clk) if (fetch_stb) fetch_data <= fetch_temp;

endmodule