add missing jtag file

junctions/src/main/scala/jtag.scala

@@ -0,0 +1,16 @@
+package junctions
+import Chisel._
+import cde.{Parameters}
+
+class JtagIO(drvTdo : Boolean = false) extends Bundle {
+
+  val TCK = Clock(OUTPUT)
+  val TMS = Bool(OUTPUT)
+  val TDI = Bool(OUTPUT)
+  val TDO = Bool(INPUT)
+  val TRST = Bool(OUTPUT)
+
+  val DRV_TDO = if (drvTdo) Some(Bool(OUTPUT)) else None
+  override def cloneType = new JtagIO(drvTdo).asInstanceOf[this.type]
+
+}