diff --git a/src/main/scala/backBoard/BackBoardMst.scala b/src/main/scala/backBoard/BackBoardMst.scala
index e133706..c0283ed 100644
--- a/src/main/scala/backBoard/BackBoardMst.scala
+++ b/src/main/scala/backBoard/BackBoardMst.scala
@@ -617,14 +617,14 @@ with BackBoardMstLVDSError{
   mirrorDown.io.enwB := false.B
   mirrorDown.io.datawB := 0.U
   mirrorDown.io.enrB := (stateCur === 4.U || stateCur === 5.U) & (ctrlTransmit | ctrlUnicast)
-  io.lvdsMst.tx_data_in := Mux( addrr.extract(0), mirrorDown.io.datarB(15,8), mirrorDown.io.datarB(7,0) )
+  io.lvdsMst.tx_data_in := Mux( addrr.extract(0), mirrorDown.io.datarB(7,0), mirrorDown.io.datarB(15,8) )
   mirrorDown.io.addrB := addrr >> 1
   
 
-  val rxData_msb = RegEnable( io.lvdsMst.rx_data_out, io.lvdsMst.rx_data_valid & (ctrlTransmit | ctrlUnicast) & ~addrw.extract(0) )
+  val rxData_lsb = RegEnable( io.lvdsMst.rx_data_out, io.lvdsMst.rx_data_valid & (ctrlTransmit | ctrlUnicast) & ~addrw.extract(0) )
   mirrorUp.io.enrB   := false.B
   mirrorUp.io.enwB   := io.lvdsMst.rx_data_valid & (ctrlTransmit | ctrlUnicast) & addrw.extract(0)
-  mirrorUp.io.datawB := (rxData_msb << 8) | io.lvdsMst.rx_data_out 
-  mirrorUp.io.addrB := addrw >> 1
+  mirrorUp.io.datawB := Cat( io.lvdsMst.rx_data_out, rxData_lsb )
+  mirrorUp.io.addrB  := addrw >> 1
   
 }