diff --git a/src/main/scala/backBoard/shin/ShinTop.scala b/src/main/scala/backBoard/shin/ShinTop.scala
index 589023f..1cb23ca 100644
--- a/src/main/scala/backBoard/shin/ShinTop.scala
+++ b/src/main/scala/backBoard/shin/ShinTop.scala
@@ -81,6 +81,8 @@ abstract class ShinTopBase extends Module{
     val up   = Module(new CDRIn with CDRInMultiSample)
     down.multiCLK := multiCLK
     up.multiCLK   := multiCLK
+    require( isMultiCLK == down.clkNum )
+    require( isMultiCLK == up.clkNum )
     (down, up)
   }