diff --git a/src/main/scala/diplomacy/Nodes.scala b/src/main/scala/diplomacy/Nodes.scala
index e160e3b1..834022dd 100644
--- a/src/main/scala/diplomacy/Nodes.scala
+++ b/src/main/scala/diplomacy/Nodes.scala
@@ -271,6 +271,23 @@ abstract class MixedNode[DI, UI, EI, BI <: Data, DO, UO, EO, BO <: Data](
   protected[diplomacy] def inputs  = iPorts.map(_._2) zip edgesIn .map(e => inner.labelI(e))
 }
 
+abstract class MixedCustomNode[DI, UI, EI, BI <: Data, DO, UO, EO, BO <: Data](
+  inner: InwardNodeImp [DI, UI, EI, BI],
+  outer: OutwardNodeImp[DO, UO, EO, BO])(
+  numPO: Range.Inclusive,
+  numPI: Range.Inclusive)
+  extends MixedNode(inner, outer)(numPO, numPI)
+{
+  def resolveStar(iKnown: Int, oKnown: Int, iStars: Int, oStars: Int): (Int, Int)
+  def mapParamsD(n: Int, p: Seq[DI]): Seq[DO]
+  def mapParamsU(n: Int, p: Seq[UO]): Seq[UI]
+}
+
+abstract class CustomNode[D, U, EO, EI, B <: Data](imp: NodeImp[D, U, EO, EI, B])(
+  numPO: Range.Inclusive,
+  numPI: Range.Inclusive)
+  extends MixedCustomNode(imp, imp)(numPO, numPI)
+
 class MixedAdapterNode[DI, UI, EI, BI <: Data, DO, UO, EO, BO <: Data](
   inner: InwardNodeImp [DI, UI, EI, BI],
   outer: OutwardNodeImp[DO, UO, EO, BO])(
diff --git a/src/main/scala/uncore/tilelink2/Nodes.scala b/src/main/scala/uncore/tilelink2/Nodes.scala
index 3857812c..5f23e2e6 100644
--- a/src/main/scala/uncore/tilelink2/Nodes.scala
+++ b/src/main/scala/uncore/tilelink2/Nodes.scala
@@ -99,6 +99,11 @@ case class TLSplitterNode(
   numManagerPorts: Range.Inclusive = 0 to 999)
   extends SplitterNode(TLImp)(clientFn, managerFn, numClientPorts, numManagerPorts)
 
+abstract class TLCustomNode(
+  numClientPorts:  Range.Inclusive,
+  numManagerPorts: Range.Inclusive)
+  extends CustomNode(TLImp)(numClientPorts, numManagerPorts)
+
 // Nodes passed from an inner module
 case class TLOutputNode() extends OutputNode(TLImp)
 case class TLInputNode() extends InputNode(TLImp)