diff --git a/src/main/scala/backBoard/shin/MstSlvSwitch.scala b/src/main/scala/backBoard/shin/MstSlvSwitch.scala
index 51879e0..ce2357f 100644
--- a/src/main/scala/backBoard/shin/MstSlvSwitch.scala
+++ b/src/main/scala/backBoard/shin/MstSlvSwitch.scala
@@ -484,12 +484,12 @@ trait MstSlvSwitchWatchDog{ this: MstSlvSwitchBase =>
   val wdtRec2RtnCnt = RegInit(0.U(32.W))
 
   when( 
-    (upCDRInAxis.io.axis.fire & upCDRInAxis.io.axis.bits.tlast) ||
+    (upCDRInAxis.io.axis.fire & isWdtRec2RtnEnable === true.B) ||
     ~interface.io.cReg.wdtEnable.extract(0) ||
     interface.io.wdtTrigger(0)
   ){
     isWdtRec2RtnEnable := false.B
-  } .elsewhen( ~isWdtRec2RtnEnable & downCDROut.io.axis.fire & interface.io.cReg.wdtEnable.extract(0) ){
+  } .elsewhen( ~isWdtRec2RtnEnable & downCDROut.io.axis.fire & downCDROut.io.axis.bits.tlast & interface.io.cReg.wdtEnable.extract(0) ){
     isWdtRec2RtnEnable := true.B
   }