diff --git a/src/main/scala/backBoard/shin/SMUnit.scala b/src/main/scala/backBoard/shin/SMUnit.scala
index 3ffeb7c..cc677b5 100644
--- a/src/main/scala/backBoard/shin/SMUnit.scala
+++ b/src/main/scala/backBoard/shin/SMUnit.scala
@@ -92,7 +92,9 @@ abstract class SMUnitBase(depth: Int = 4) extends Module with RequireAsyncReset{
 
   io.cnt := cPtr - rPtr
 
-  when( io.isComf ){
+  when( io.flush ){
+    cPtr := 0.U
+  } .elsewhen( io.isComf ){
     cPtr := wPtr
   }