diff --git a/src/main/scala/backBoard/shin/SMUnit.scala b/src/main/scala/backBoard/shin/SMUnit.scala
index cc677b5..f172d56 100644
--- a/src/main/scala/backBoard/shin/SMUnit.scala
+++ b/src/main/scala/backBoard/shin/SMUnit.scala
@@ -39,7 +39,6 @@ class SMUnitIO(depth: Int) extends Bundle {
 }
 
 abstract class SMUnitBase(depth: Int = 4) extends Module with RequireAsyncReset{
-  require(depth <= 4)
   val io: SMUnitIO = IO(new SMUnitIO(depth))