diff --git a/ReceptionTrame_lib/receptionTrame_com.vhd b/ReceptionTrame_lib/receptionTrame_com.vhd
index 3e5b3e5..4c2b689 100644
--- a/ReceptionTrame_lib/receptionTrame_com.vhd
+++ b/ReceptionTrame_lib/receptionTrame_com.vhd
@@ -30,7 +30,7 @@ ENTITY receptionTrame_com IS
 END receptionTrame_com;
 
 ARCHITECTURE arch of receptionTrame_com IS
-TYPE state IS (waiting, syncBreak0, syncBreak1, syncFieldWait, syncFieldStart, syncFieldData, syncFieldStop, idFieldWait, idFieldStart, idFieldData, idFieldStop, dataFieldWait, dataFieldStart, dataFieldData, dataFieldStop);
+TYPE state IS (waiting, syncBreak0, syncBreak1, syncFieldWait, syncFieldStart, syncFieldData, syncFieldStop, idFieldWait, idFieldStart, idFieldData, idFieldStop, dataFieldWait, dataFieldStart, dataFieldData, dataFieldStop, checksumFieldWait, checksumFieldStart, checksumFieldData, checksumFieldStop);
 SIGNAL cState, nState : state;
 BEGIN
 
@@ -149,7 +149,7 @@ CASE cState IS
     if(n_0 = '1') then
       if(LinSynchro = '1') then
         if(nbData_0 = '1') then
-          nState <= waiting;
+          nState <= checksumFieldWait;
         else
           nState <= dataFieldWait;
         end if;
@@ -158,7 +158,30 @@ CASE cState IS
       end if;
     end if;
 
-  WHEN others =>
+  WHEN checksumFieldWait =>
+    if(LinSynchro = '0') then
+      nState <= checksumFieldStart;
+    end if;
+
+  WHEN checksumFieldStart =>
+    if(n_0 = '1') then
+      if(LinSynchro = '0') then
+        nState <= checksumFieldData;
+      else
+        nState <= waiting;
+      end if;
+    end if;
+
+  WHEN checksumFieldData =>
+    if(nbBit_0 = '1') then
+      nState <= checksumFieldStop;
+    end if;
+
+  WHEN checksumFieldStop =>
+    if(n_0 = '1') then
+      nState <= waiting;
+    end if;
+
   end CASE;
 END PROCESS nStateUpd;
 
@@ -356,8 +379,46 @@ BEGIN
         n_LOAD <= '0';
         n_EN <= '1';
       end if;
+
+    WHEN checksumFieldWait =>
+      if(LinSynchro = '0') then
+        n_SELECT <= '1';
+        n_LOAD <= '1';
+      end if;
+
+    WHEN checksumFieldStart =>
+      if(n_0 = '1') then
+        n_SELECT <= '0';
+        n_LOAD <= '1';
+        nbBit_SELECT <= '1';
+        nbBit_LOAD <= '1';
+      else
+        n_LOAD <= '0';
+        n_EN <= '1';
+      end if;
+
+    WHEN checksumFieldData =>
+      if(nbBit_0 = '1') then
+        n_SELECT <= '0';
+        n_LOAD <= '1';
+        octetRecu_EN <= '0';
+      else
+        if(n_0 = '1') then
+          n_LOAD <= '1';
+          n_SELECT <= '0';
+          nbBit_EN <= '1';
+          octetRecu_EN <= '1';
+        else
+          n_LOAD <= '0';
+          nbBIt_EN <= '0';
+          octetRecu_EN <= '0';
+        end if;
+        nbBit_LOAD <= '0';
+        n_EN <= '1';
+      end if;
+
+    WHEN checksumFieldStop =>
     
-    WHEN others =>
       
   end CASE;
 END PROCESS RCS;