diff --git a/src/main/scala/backBoard/shin/MasterParser.scala b/src/main/scala/backBoard/shin/MasterParser.scala
index 280bd54..4587998 100644
--- a/src/main/scala/backBoard/shin/MasterParser.scala
+++ b/src/main/scala/backBoard/shin/MasterParser.scala
@@ -210,10 +210,18 @@ with MasterParserStat{
   io.deltaTimeStamp := deltaTimeStamp
 
   val txStamps = Reg(UInt(32.W))
+  val pkgChkCnt = Reg(UInt(4.W))
+  
+  when( io.upIn.fire & io.upIn.bits.tlast ){
+    pkgChkCnt := 0.U
+  } .elsewhen( io.downOut.fire & pkgChkCnt =/= 9.U  ){
+    pkgChkCnt := pkgChkCnt + 1.U
+  }
+
 
   when( io.downOut.fire & io.downOut.bits.tlast ){
     txStamps := io.cReg.timeStamp(31,0)
-  } .elsewhen( io.upIn.fire & io.upIn.bits.tlast & ~io.upIn.bits.tuser ){
+  } .elsewhen( io.upIn.fire & io.upIn.bits.tlast & ~io.upIn.bits.tuser & pkgChkCnt === 9.U ){
     deltaTimeStamp := io.cReg.timeStamp(31,0) - txStamps
   }
 }
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