diff --git a/generators/chipyard/src/main/scala/config/fragments/SubsystemFragments.scala b/generators/chipyard/src/main/scala/config/fragments/SubsystemFragments.scala
index 021bd7ab..f8119600 100644
--- a/generators/chipyard/src/main/scala/config/fragments/SubsystemFragments.scala
+++ b/generators/chipyard/src/main/scala/config/fragments/SubsystemFragments.scala
@@ -23,3 +23,6 @@ class WithInclusiveCacheInteriorBuffer(buffer: InclusiveCachePortParameters = In
   case InclusiveCacheKey => up(InclusiveCacheKey).copy(bufInnerInterior=buffer, bufOuterInterior=buffer)
 })
 
+class WithInclusiveCacheExteriorBuffer(buffer: InclusiveCachePortParameters = InclusiveCachePortParameters.full) extends Config((site, here, up) => {
+  case InclusiveCacheKey => up(InclusiveCacheKey).copy(bufInnerExterior=buffer, bufOuterExterior=buffer)
+})