diff --git a/src/main/scala/backBoard/shin/ShinTop.scala b/src/main/scala/backBoard/shin/ShinTop.scala
index 601dc6f..1c4228b 100644
--- a/src/main/scala/backBoard/shin/ShinTop.scala
+++ b/src/main/scala/backBoard/shin/ShinTop.scala
@@ -432,23 +432,23 @@ with ShinTopSlave
 with ShinTopWatchDog{
 
   when( interface.io.cReg.modeSel === false.B ){ //slave
-    when( (slaveParser.io.intHWTrig(0) | slaveParser.io.intHWTrig(1)) ){
+    when( (slaveParser.io.intHWTrig(0) | slaveParser.io.intHWTrig(1)) ){ //硬件错误
       downCDRIn.io.serDat  := false.B
       upCDRIn.io.serDat  := false.B
-      when( slaveParser.io.isLoop ){
+      when( slaveParser.io.isLoop ){ //回环
         io.dDatOut := false.B
         io.uDatOut := io.dDatIn
-      } .otherwise{
+      } .otherwise{ //非回环
         io.dDatOut := io.dDatIn
         io.uDatOut := io.uDatIn      
       }
-    } .otherwise{
-      when( slaveParser.io.isLoop ){
+    } .otherwise{ //无硬件错误
+      when( slaveParser.io.isLoop ){ //回环
         downCDRIn.io.serDat  := io.dDatIn
         upCDRIn.io.serDat    := downCDROut.io.serDat
         io.dDatOut := false.B
         io.uDatOut := upCDROut.io.serDat 
-      } .otherwise{
+      } .otherwise{ //非回环
         downCDRIn.io.serDat  := io.dDatIn
         upCDRIn.io.serDat    := io.uDatIn
         io.dDatOut := downCDROut.io.serDat