From 53721ff4fd53f27edd75de8eb649a2e20390cceb Mon Sep 17 00:00:00 2001
From: Jim Lawson
Date: Thu, 15 Sep 2016 15:43:52 -0700
Subject: add optional directionality assumption to BiConnect.elemConnect

---
 chiselFrontend/src/main/scala/chisel3/core/BiConnect.scala | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/chiselFrontend/src/main/scala/chisel3/core/BiConnect.scala b/chiselFrontend/src/main/scala/chisel3/core/BiConnect.scala
index b0be1c38..ce70a19a 100644
--- a/chiselFrontend/src/main/scala/chisel3/core/BiConnect.scala
+++ b/chiselFrontend/src/main/scala/chisel3/core/BiConnect.scala
@@ -217,8 +217,18 @@ object BiConnect {
 
         case (Some(Input),  Some(Input))  => throw NeitherDriverException
         case (Some(Output), Some(Output)) => throw BothDriversException
-        case (_, None)                    => throw UnknownRelationException
-        case (None, _)                    => throw UnknownRelationException
+        case (_, None)                    =>
+          if (connectCompileOptions.dontAssumeDirectionality) {
+            throw UnknownRelationException
+          } else {
+            issueConnectR2L(left, right)
+          }
+        case (None, _)                    =>
+          if (connectCompileOptions.dontAssumeDirectionality) {
+            throw UnknownRelationException
+          } else {
+            issueConnectR2L(left, right)
+          }
       }
     }
 
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