diff --git a/src/main/scala/tilelink/CacheCork.scala b/src/main/scala/tilelink/CacheCork.scala
index 53a54e24..69964e7e 100644
--- a/src/main/scala/tilelink/CacheCork.scala
+++ b/src/main/scala/tilelink/CacheCork.scala
@@ -20,9 +20,8 @@ class TLCacheCork(unsafe: Boolean = false)(implicit p: Parameters) extends LazyM
       mp.copy(
         endSinkId = 1,
         managers = mp.managers.map { m => m.copy(
-          regionType         = if (m.regionType == RegionType.UNCACHED) RegionType.TRACKED else m.regionType,
-          supportsAcquireB   = m.supportsGet,
-          supportsAcquireT   = m.supportsPutFull)})})
+          supportsAcquireB = if (m.regionType == RegionType.UNCACHED) m.supportsGet     else m.supportsAcquireB,
+          supportsAcquireT = if (m.regionType == RegionType.UNCACHED) m.supportsPutFull else m.supportsAcquireT)})})
 
   lazy val module = new LazyModuleImp(this) {
     val io = new Bundle {
@@ -37,6 +36,7 @@ class TLCacheCork(unsafe: Boolean = false)(implicit p: Parameters) extends LazyM
       require (caches.size <= 1 || unsafe, "Only one caching client allowed")
       edgeOut.manager.managers.foreach { case m =>
         require (!m.supportsAcquireB || unsafe, "Cannot support caches beyond the Cork")
+        require (m.regionType <= RegionType.UNCACHED)
       }
 
       // The Cork turns [Acquire=>Get] => [AccessAckData=>GrantData]
diff --git a/src/main/scala/tilelink/Parameters.scala b/src/main/scala/tilelink/Parameters.scala
index 716b5284..d36c9229 100644
--- a/src/main/scala/tilelink/Parameters.scala
+++ b/src/main/scala/tilelink/Parameters.scala
@@ -38,8 +38,9 @@ case class TLManagerParameters(
   require (supportsAcquireB.contains(supportsAcquireT))
 
   // Make sure that the regionType agrees with the capabilities
-  require ((regionType == RegionType.CACHED || regionType == RegionType.TRACKED) != supportsAcquireB.none)
-  require (regionType != RegionType.UNCACHED || supportsGet)
+  require (!supportsAcquireB || regionType >= RegionType.UNCACHED) // acquire -> uncached, tracked, cached
+  require (regionType <= RegionType.UNCACHED || supportsAcquireB)  // tracked, cached -> acquire
+  require (regionType != RegionType.UNCACHED || supportsGet) // uncached -> supportsGet
 
   val name = nodePath.lastOption.map(_.lazyModule.name).getOrElse("disconnected")
   val maxTransfer = List( // Largest supported transfer of all types