diff --git a/designs/LFR-em-WFP_MS-EQM2test/LFR-em.vhd b/designs/LFR-em-WFP_MS-EQM2test/LFR-em.vhd
--- a/designs/LFR-em-WFP_MS-EQM2test/LFR-em.vhd
+++ b/designs/LFR-em-WFP_MS-EQM2test/LFR-em.vhd
@@ -425,7 +425,7 @@ BEGIN  -- beh
       pirq_ms                => 6,
       pirq_wfp               => 14,
       hindex                 => 2,
-      top_lfr_version        => X"010158",  -- aa.bb.cc version
+      top_lfr_version        => X"010159",  -- aa.bb.cc version
                                             -- AA : BOARD NUMBER
                                             --      0 => MINI_LFR
                                             --      1 => EM
diff --git a/lib/lpp/dsp/window_function/WF_processing.vhd b/lib/lpp/dsp/window_function/WF_processing.vhd
--- a/lib/lpp/dsp/window_function/WF_processing.vhd
+++ b/lib/lpp/dsp/window_function/WF_processing.vhd
@@ -34,7 +34,7 @@ ENTITY WF_processing IS
   GENERIC (
     SIZE_DATA  : INTEGER := 16;
     SIZE_PARAM : INTEGER := 10;
-    NB_POINT_BY_WINDOW : INTEGER := 256    
+    NB_POINT_BY_WINDOW : INTEGER := 256
     );
 
   PORT (
@@ -51,7 +51,8 @@ ENTITY WF_processing IS
     
     --window parameter interface
     param_in    : IN STD_LOGIC_VECTOR(SIZE_PARAM-1 DOWNTO 0);
-    param_index : OUT INTEGER RANGE 0 TO NB_POINT_BY_WINDOW-1 
+    param_index : OUT INTEGER RANGE 0 TO NB_POINT_BY_WINDOW-1;
+    PARAM_ALL_POSITIVE : IN STD_LOGIC
     );
 
 END WF_processing;
@@ -93,8 +94,10 @@ BEGIN
       OP2   => param_in,
       
       RES   => data_x_param);
-
-  data_out <= data_x_param(SIZE_DATA + SIZE_PARAM-1 DOWNTO SIZE_PARAM);
+  
+  data_out <= data_x_param(SIZE_DATA + SIZE_PARAM-2 DOWNTO SIZE_PARAM-1) WHEN PARAM_ALL_POSITIVE = '1' ELSE
+              data_x_param(SIZE_DATA + SIZE_PARAM-1 DOWNTO SIZE_PARAM);
+  
 
   WINDOWS_REG: SYNC_FF
     GENERIC MAP (
@@ -105,4 +108,4 @@ BEGIN
       A      => data_in_valid,
       A_sync => data_out_valid);
   
-END beh;
+END beh;
\ No newline at end of file
diff --git a/lib/lpp/dsp/window_function/WF_rom.vhd b/lib/lpp/dsp/window_function/WF_rom.vhd
--- a/lib/lpp/dsp/window_function/WF_rom.vhd
+++ b/lib/lpp/dsp/window_function/WF_rom.vhd
@@ -36,7 +36,8 @@ ENTITY WF_rom IS
     );
   PORT (
     data  : OUT STD_LOGIC_VECTOR(SIZE_PARAM-1 DOWNTO 0);
-    index : IN  INTEGER RANGE 0 TO NB_POINT_BY_WINDOW-1 
+    index : IN  INTEGER RANGE 0 TO NB_POINT_BY_WINDOW-1 ;
+    PARAM_ALL_POSITIVE : OUT STD_LOGIC
     );
 END WF_rom;
 
@@ -82,6 +83,8 @@ ARCHITECTURE beh OF WF_rom IS
   SIGNAL data_selected : STD_LOGIC_VECTOR(SIZE_ARRAY_PARAM-1 DOWNTO 0);
 BEGIN
 
+  PARAM_ALL_POSITIVE <= '1';
+
   ALL_PARAM_DEFINE: IF NB_POINT_BY_WINDOW < SIZE_ARRAY + 1 GENERATE
     data_selected <= ROM_array(index);
   END GENERATE ALL_PARAM_DEFINE;
@@ -93,4 +96,4 @@ BEGIN
 
   data <= data_selected(SIZE_ARRAY_PARAM-1 DOWNTO SIZE_ARRAY_PARAM-SIZE_PARAM);
   
-END beh;
+END beh;
\ No newline at end of file
diff --git a/lib/lpp/dsp/window_function/window_function.vhd b/lib/lpp/dsp/window_function/window_function.vhd
--- a/lib/lpp/dsp/window_function/window_function.vhd
+++ b/lib/lpp/dsp/window_function/window_function.vhd
@@ -55,6 +55,8 @@ ARCHITECTURE beh OF window_function IS
   SIGNAL param_in       : STD_LOGIC_VECTOR(SIZE_PARAM-1 DOWNTO 0);
   SIGNAL param_index    : INTEGER RANGE 0 TO NB_POINT_BY_WINDOW-1;
   
+  SIGNAL PARAM_ALL_POSITIVE : STD_LOGIC;
+  
 BEGIN
 
   WF_rom_1: WF_rom
@@ -62,8 +64,9 @@ BEGIN
       SIZE_PARAM         => SIZE_PARAM,
       NB_POINT_BY_WINDOW => NB_POINT_BY_WINDOW)
     PORT MAP (
-      data  => param_in,
-      index => param_index);
+      data               => param_in,
+      index              => param_index,
+      PARAM_ALL_POSITIVE => PARAM_ALL_POSITIVE );
   
   WF_processing_1: WF_processing
     GENERIC MAP (
@@ -79,6 +82,7 @@ BEGIN
       data_out       => data_out,
       data_out_valid => data_out_valid,
       param_in       => param_in,
-      param_index    => param_index);
+      param_index    => param_index,
+      PARAM_ALL_POSITIVE => PARAM_ALL_POSITIVE );
   
-END beh;
+END beh;
\ No newline at end of file
diff --git a/lib/lpp/dsp/window_function/window_function_pkg.vhd b/lib/lpp/dsp/window_function/window_function_pkg.vhd
--- a/lib/lpp/dsp/window_function/window_function_pkg.vhd
+++ b/lib/lpp/dsp/window_function/window_function_pkg.vhd
@@ -56,7 +56,8 @@ PACKAGE window_function_pkg IS
       data_out       : OUT STD_LOGIC_VECTOR(SIZE_DATA-1 DOWNTO 0);
       data_out_valid : OUT STD_LOGIC;
       param_in       : IN  STD_LOGIC_VECTOR(SIZE_PARAM-1 DOWNTO 0);
-      param_index    : OUT INTEGER RANGE 0 TO NB_POINT_BY_WINDOW-1
+      param_index    : OUT INTEGER RANGE 0 TO NB_POINT_BY_WINDOW-1;
+      PARAM_ALL_POSITIVE : IN STD_LOGIC
       );
   END COMPONENT;
 
@@ -66,7 +67,8 @@ PACKAGE window_function_pkg IS
       NB_POINT_BY_WINDOW : INTEGER);
     PORT (
       data  : OUT STD_LOGIC_VECTOR(SIZE_PARAM-1 DOWNTO 0);
-      index : IN  INTEGER RANGE 0 TO NB_POINT_BY_WINDOW-1);
+      index : IN  INTEGER RANGE 0 TO NB_POINT_BY_WINDOW-1;
+      PARAM_ALL_POSITIVE : OUT STD_LOGIC);
   END COMPONENT;  
   
 END window_function_pkg;