diff --git a/lib/VGA_ctrl/src/vga_types.vhd b/lib/VGA_ctrl/src/vga_types.vhd
index 6ca9520..e8fa93e 100644
--- a/lib/VGA_ctrl/src/vga_types.vhd
+++ b/lib/VGA_ctrl/src/vga_types.vhd
@@ -44,7 +44,7 @@ package vga_types is
 	-- For test bench (not for H/W use)
 	constant ts_vga_testbench : vga_timespec_t :=
 	(
-		f_pxl_clk              => 100E6,
+		f_pxl_clk              => 40E6,
 		nfps                   => 6,
 		ts_h                   => (80,5,2,3,'0'),
 		ts_v                   => (60,4,2,3,'0')