From 7922f8d4998dd902ee18a6e85e4a404a1f29eb3f Mon Sep 17 00:00:00 2001
From: Jim Lawson
Date: Wed, 17 Aug 2016 13:30:05 -0700
Subject: Rocket-chip updates. Assume LHSItOutput if neither side is driving.
 Restore Wire()'s removal of direction in binding.

---
 chiselFrontend/src/main/scala/chisel3/core/BiConnect.scala | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

(limited to 'chiselFrontend/src/main/scala/chisel3/core/BiConnect.scala')

diff --git a/chiselFrontend/src/main/scala/chisel3/core/BiConnect.scala b/chiselFrontend/src/main/scala/chisel3/core/BiConnect.scala
index b7fd65a5..c40b85ad 100644
--- a/chiselFrontend/src/main/scala/chisel3/core/BiConnect.scala
+++ b/chiselFrontend/src/main/scala/chisel3/core/BiConnect.scala
@@ -188,7 +188,13 @@ object BiConnect {
             throw BothDriversException
           }
         }
-        case (None,         None)         => throw UnknownDriverException
+        case (None,         None)         => {
+          if (compileOptions.assumeLHSIsOutput) {
+            issueConnectR2L(left, right)
+          } else {
+            throw UnknownDriverException
+          }
+        }
       }
     }
 
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