diff --git a/src/main/scala/backBoard/shin/NSpiInterface.scala b/src/main/scala/backBoard/shin/NSpiInterface.scala
index c726a24..bf29881 100644
--- a/src/main/scala/backBoard/shin/NSpiInterface.scala
+++ b/src/main/scala/backBoard/shin/NSpiInterface.scala
@@ -59,7 +59,7 @@ trait SyncSpiAsync{ this: SyncSpiInterfaceBase =>
   }
 
 
-  when( bitSel <= 3.U ){ //单线操作
+  when( byteSel <= 3.U ){ //单线操作
     when( bitSel === 0.U ){
       exRegi := Cat( 0.U, qspi.mosi.extract(0) )
     }.otherwise{