diff --git a/src/main/scala/backBoard/ebus/CDRIn.scala b/src/main/scala/backBoard/ebus/CDRIn.scala
index 4c0c7b1..9bbbf98 100644
--- a/src/main/scala/backBoard/ebus/CDRIn.scala
+++ b/src/main/scala/backBoard/ebus/CDRIn.scala
@@ -155,14 +155,20 @@ trait CDRInMultiSample{ this: CDRInBase =>
     }
   }.elsewhen( checkCnt.andR ){ //锁定之后，只允许每16cycle移动一相位
     assert( arbCali >= 2.U  && arbCali < 118.U )
-    for( i <- 0 until 5 ){
-      val j = 5 - i -1
-      when( checkWindow(j) ^ checkWindow(j+1) ){
-        when( j.U < arbCali ){
-          arbCali := arbCali - 1.U
-        } .elsewhen( j.U > arbCali ){
-          arbCali := arbCali + 1.U
-        }
+
+    when(
+      (checkWindow(0) ^ checkWindow(1)) |
+      (checkWindow(1) ^ checkWindow(2))
+    ){
+      when( arbCali =/= 2.U ){
+        arbCali := arbCali - 1.U
+      }
+    } .elsewhen(
+      (checkWindow(3) ^ checkWindow(4)) |
+      (checkWindow(4) ^ checkWindow(5))
+    ){
+      when( arbCali =/= 117.U ){
+        arbCali := arbCali + 1.U
       }
     }
   }