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diff --git a/src/test/scala/firrtlTests/CInferMDirSpec.scala b/src/test/scala/firrtlTests/CInferMDirSpec.scala
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+/*
+Copyright (c) 2014 - 2016 The Regents of the University of
+California (Regents). All Rights Reserved.  Redistribution and use in
+source and binary forms, with or without modification, are permitted
+provided that the following conditions are met:
+   * Redistributions of source code must retain the above
+     copyright notice, this list of conditions and the following
+     two paragraphs of disclaimer.
+   * Redistributions in binary form must reproduce the above
+     copyright notice, this list of conditions and the following
+     two paragraphs of disclaimer in the documentation and/or other materials
+     provided with the distribution.
+   * Neither the name of the Regents nor the names of its contributors
+     may be used to endorse or promote products derived from this
+     software without specific prior written permission.
+IN NO EVENT SHALL REGENTS BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT,
+SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING LOST PROFITS,
+ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF
+REGENTS HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+REGENTS SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE. THE SOFTWARE AND ACCOMPANYING DOCUMENTATION, IF
+ANY, PROVIDED HEREUNDER IS PROVIDED "AS IS". REGENTS HAS NO OBLIGATION
+TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR
+MODIFICATIONS.
+*/
+
+package firrtlTests
+
+import firrtl._
+import firrtl.ir._
+import firrtl.passes._
+import firrtl.Mappers._
+import Annotations._
+
+class CInferMDir extends LowTransformSpec {
+  object CInferMDirCheckPass extends Pass {
+    val name = "Check Enable Signal for Chirrtl Mems"
+
+    // finds the memory and check its read port
+    def checkStmt(s: Statement): Boolean = s match {
+      case s: DefMemory if s.name == "indices" =>
+        (s.readers contains "index") &&
+        (s.writers contains "bar") &&
+        s.readwriters.isEmpty
+      case s: Block =>
+        s.stmts exists checkStmt
+      case _ => false
+    }
+
+    def run (c: Circuit) = {
+      val errors = new Errors
+      val check = c.modules exists {
+        case m: Module => checkStmt(m.body)
+        case m: ExtModule => false
+      }
+      if (!check) {
+        errors append new PassException(
+          "Memory has incorrect port directions!")
+        errors.trigger
+      }
+      c
+    }
+  }
+
+  object CInferMDirCheck extends Transform with SimpleRun {
+    def execute(c: Circuit, map: AnnotationMap) =
+      run(c, Seq(ConstProp, CInferMDirCheckPass))
+  }
+
+  def transform = CInferMDirCheck
+
+  "Memory" should "have correct mem port directions" in {
+    val input = """
+circuit foo :
+  module foo :
+    input clk : Clock
+    input reset : UInt<1>
+    output io : {flip wen : UInt<1>, flip in : UInt<1>, flip counter : UInt<2>, ren: UInt<1>[4], out : UInt<1>[4]}
+
+    io is invalid
+    cmem indices : UInt<2>[4]
+    node T_0 = add(io.counter, UInt<1>("h01"))
+    node temp = tail(T_0, 1)
+    infer mport index = indices[temp], clk
+    io.out[0] <= UInt<1>("h0")
+    io.out[1] <= UInt<1>("h0")
+    io.out[2] <= UInt<1>("h0")
+    io.out[3] <= UInt<1>("h0")
+    when io.ren[index] :
+      io.out[index] <= io.in
+    else :
+      when io.wen :
+        infer mport bar = indices[temp], clk
+        bar <= io.in
+""".stripMargin
+
+    val annotationMap = AnnotationMap(Nil)
+    val writer = new java.io.StringWriter
+    compile(parse(input), annotationMap, writer)
+    // Check correctness of firrtl
+    parse(writer.toString)
+  }
+}