Revert "从机上下行机制分叉"

This reverts commit a9f4fd18ab.

src/main/scala/backBoard/Qei.scala

@@ -96,8 +96,7 @@ trait BackBoardSlvQei{ this: BackBoardSlvLocal =>
 }        
 
 
-class Qei extends BackBoardSlvLocal with BackBoardSlvDown with BackBoardSlvUp
-with BackBoardSlvStatusPR with BackBoardSlvQei{
+class Qei extends BackBoardSlvLocal with BackBoardSlvStatusPR with BackBoardSlvQei{
   val phaseAIO    = for( i <- 0 until 2 ) yield { IO(Input(Bool())) }
   val phaseBIO    = for( i <- 0 until 2 ) yield { IO(Input(Bool())) }
   val phaseZIO    = for( i <- 0 until 2 ) yield { IO(Input(Bool())) }