From 13981379c4457ec754ff04d58cecbc4a313e5ed5 Mon Sep 17 00:00:00 2001
From: "Wesley W. Terpstra" <wesley@sifive.com>
Date: Thu, 26 Oct 2017 23:39:56 -0700
Subject: [PATCH] CoreplexClockCrossing: add a helper method to decide if a
 clock is useul (#1074)

---
 src/main/scala/coreplex/CrossingWrapper.scala | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/main/scala/coreplex/CrossingWrapper.scala b/src/main/scala/coreplex/CrossingWrapper.scala
index 1b6f1a4d..ec638ebb 100644
--- a/src/main/scala/coreplex/CrossingWrapper.scala
+++ b/src/main/scala/coreplex/CrossingWrapper.scala
@@ -12,6 +12,12 @@ import freechips.rocketchip.util._
 
 /** Enumerates the three types of clock crossing between tiles and system bus */
 sealed trait CoreplexClockCrossing
+{
+  def sameClock = this match {
+    case _: SynchronousCrossing => true
+    case _ => false
+  }
+}
 case class SynchronousCrossing(params: BufferParams = BufferParams.default) extends CoreplexClockCrossing
 case class RationalCrossing(direction: RationalDirection = FastToSlow) extends CoreplexClockCrossing
 case class AsynchronousCrossing(depth: Int, sync: Int = 3) extends CoreplexClockCrossing