diff --git a/src/main/scala/backBoard/shin/MstSlvSwitch.scala b/src/main/scala/backBoard/shin/MstSlvSwitch.scala
index 47c515d..e79da61 100644
--- a/src/main/scala/backBoard/shin/MstSlvSwitch.scala
+++ b/src/main/scala/backBoard/shin/MstSlvSwitch.scala
@@ -635,7 +635,7 @@ trait MstSlvSwitchCDRIn{ this: MstSlvSwitchBase =>
 
   when(cdrSelB){
     io.downCDRSampleIn(1).serDat := downInSerDat
-    io.upCDRSampleIn(1).serDat   := downInSerDat
+    io.upCDRSampleIn(1).serDat   := upInSerDat
     downInSyncSerDat := io.downCDRSampleIn(1).syncSerDat
     upInSyncSerDat := io.upCDRSampleIn(1).syncSerDat
     
@@ -645,7 +645,7 @@ trait MstSlvSwitchCDRIn{ this: MstSlvSwitchBase =>
     io.upCDRSampleIn(2).serDat   := false.B
   } .elsewhen(cdrSelC){
     io.downCDRSampleIn(2).serDat := downInSerDat
-    io.upCDRSampleIn(2).serDat   := downInSerDat
+    io.upCDRSampleIn(2).serDat   := upInSerDat
     downInSyncSerDat := io.downCDRSampleIn(2).syncSerDat
     upInSyncSerDat := io.upCDRSampleIn(2).syncSerDat
 
@@ -655,7 +655,7 @@ trait MstSlvSwitchCDRIn{ this: MstSlvSwitchBase =>
     io.upCDRSampleIn(1).serDat   := false.B
   } .otherwise{
     io.downCDRSampleIn(0).serDat := downInSerDat
-    io.upCDRSampleIn(0).serDat   := downInSerDat
+    io.upCDRSampleIn(0).serDat   := upInSerDat
     downInSyncSerDat := io.downCDRSampleIn(0).syncSerDat
     upInSyncSerDat := io.upCDRSampleIn(0).syncSerDat