diff --git a/src/main/scala/util/ShiftReg.scala b/src/main/scala/util/ShiftReg.scala
index 204d8195..917447f8 100644
--- a/src/main/scala/util/ShiftReg.scala
+++ b/src/main/scala/util/ShiftReg.scala
@@ -11,7 +11,7 @@ object ShiftRegInit {
   def apply[T <: Data](in: T, n: Int, init: T, name: Option[String] = None): T =
 
   (0 until n).foldRight(in) {
-    case (next, i) => {
+    case (i, next) => {
       val r = Reg(next, next = next, init = init)
       name.foreach { na => r.suggestName(s"${na}_${i}") }
       r
@@ -52,7 +52,7 @@ object AbstractPipelineReg {
 }
 
 class AsyncResetShiftReg(w: Int = 1, depth: Int = 1, init: Int = 0, name: String = "pipe") extends AbstractPipelineReg(w) {
-  require(depth >= 0, "Depth must be greater than or equal to 0.")
+  require(depth > 0, "Depth must be greater than 0.")
 
   override def desiredName = s"AsyncResetShiftReg_w${w}_d${depth}_i${init}"