diff --git a/lib/VGA_ctrl/src/vga_types.vhd b/lib/VGA_ctrl/src/vga_types.vhd
index 44cecbd..e778405 100644
--- a/lib/VGA_ctrl/src/vga_types.vhd
+++ b/lib/VGA_ctrl/src/vga_types.vhd
@@ -12,10 +12,14 @@ use IEEE.MATH_REAL.ALL;
 package vga_types is
 	
 	-- Constants
-
+	constant	VGA_NUM_CH		: natural := 2;
+	
 	-- Types
-	type color_range_t is (r, g, b);
+	type color_range_t is (r, g, b, a);
 	type color_t is array (color_range_t) of unsigned(7 downto 0);
+	type color_array_t is array (0 to VGA_NUM_CH-1) of color_t;
+
+	type color_op_t is (op_over, op_xor, op_alpha);
 	
 	type scan_timespec_t is
 	record
@@ -42,8 +46,8 @@ package vga_types is
 	(
 		f_pxl_clk              => 100E6,
 		nfps                   => 6,
-		ts_h                   => (8,5,2,3,'0'),
-		ts_v                   => (6,4,2,3,'0')
+		ts_h                   => (80,5,2,3,'0'),
+		ts_v                   => (60,4,2,3,'0')
 	);
 
 	-- 640 x 480 @ 60 Hz (not recommended)