diff --git a/src/main/scala/backBoard/LocalRegisters.scala b/src/main/scala/backBoard/LocalRegisters.scala
index 135d706..2677006 100644
--- a/src/main/scala/backBoard/LocalRegisters.scala
+++ b/src/main/scala/backBoard/LocalRegisters.scala
@@ -76,7 +76,7 @@ abstract class BackBoardSlvLocal extends BackBoardSlvBase with BackBoardSlvDown
 
   io.isOnline := false.B
 
-  val isUpdate = (statusSync & ~RegNext(io.DCIn) & io.DCIn) | (~statusSync)
+  val isUpdate = (statusSync & ShiftRegister(io.DCIn, 3)) | (~statusSync)
 
 }