拆分寄存器域，编译有问题

src/main/scala/Switch/Parameters.scala

@@ -15,9 +15,10 @@ case object SwitchParamsKey extends Field[SwitchSetting]
 
 case class SwitchSetting(
   // isTileLink: Boolean = true
-  chn: Int = 1
+  chn: Int = 3
 ){
-
+  require( chn > 0 , "Error, at least one mac chn!\n" )
+  require( chn <= 16, "Error, register address between only 0x000~0x1000, 0x100 for each!\n" )
 }
 
 trait HasSwitchParameters {