diff --git a/vhdl/RGBtoHDMI.vhdl b/vhdl/RGBtoHDMI.vhdl
index ca918143..c43b6379 100644
--- a/vhdl/RGBtoHDMI.vhdl
+++ b/vhdl/RGBtoHDMI.vhdl
@@ -98,7 +98,7 @@ architecture Behavorial of RGBtoHDMI is
     signal csync2   : std_logic;
     signal last     : std_logic;
 
-    signal csync_counter : unsigned(3 downto 0);
+    signal csync_counter : unsigned(1 downto 0);
 
     -- The sampling counter runs at 96MHz
     -- - In modes 0..6 it is 6x  the pixel clock
@@ -191,7 +191,7 @@ begin
                 -- output different to input
                 csync_counter <= csync_counter + 1;
                 -- if the difference lasts for N-1 cycles, update the output
-                if csync_counter = 15 then
+                if csync_counter = 3 then
                     csync2 <= csync1;
                 end if;
             end if;
diff --git a/vhdl/fitting.notes b/vhdl/fitting.notes
index 4307ce66..534a9214 100644
--- a/vhdl/fitting.notes
+++ b/vhdl/fitting.notes
@@ -322,3 +322,25 @@ FB3          18/18*      29/54       79/90       9/ 9*
 FB4          18/18*      46/54       71/90       5/ 7
              -----       -----       -----      -----
              70/72      131/216     229/360     28/34
+
+29. Reduce csync de-glitch counter to 3 bits
+
+Function    Mcells      FB Inps     Pterms      IO
+Block       Used/Tot    Used/Tot    Used/Tot    Used/Tot
+FB1          18/18*      31/54       45/90       6/ 9
+FB2          16/18       25/54       34/90       8/ 9
+FB3          18/18*      29/54       79/90       9/ 9*
+FB4          17/18       45/54       67/90       5/ 7
+             -----       -----       -----      -----
+             69/72      130/216     225/360     28/34
+
+30. Reduce csync de-glitch counter to 2 bits
+
+Function    Mcells      FB Inps     Pterms      IO
+Block       Used/Tot    Used/Tot    Used/Tot    Used/Tot
+FB1          18/18*      31/54       45/90       6/ 9
+FB2          16/18       25/54       34/90       8/ 9
+FB3          18/18*      29/54       79/90       9/ 9*
+FB4          16/18       44/54       63/90       5/ 7
+             -----       -----       -----      -----
+             68/72      129/216     221/360     28/34