Merge pull request #37 from ucb-bar/utilsplit

Break out Utils.scala into smaller portions

1 files changed, 22 insertions, 0 deletions

diff --git a/src/main/scala/Chisel/util/LFSR.scala b/src/main/scala/Chisel/util/LFSR.scala
new file mode 100644
index 00000000..839b1d1f
--- /dev/null
+++ b/src/main/scala/Chisel/util/LFSR.scala
@@ -0,0 +1,22 @@
+// See LICENSE for license details.
+
+/** LFSRs in all shapes and sizes.
+  */
+
+package Chisel
+
+// scalastyle:off magic.number
+/** linear feedback shift register
+  */
+object LFSR16
+{
+  def apply(increment: Bool = Bool(true)): UInt =
+  {
+    val width = 16
+    val lfsr = Reg(init=UInt(1, width))
+    when (increment) { lfsr := Cat(lfsr(0)^lfsr(2)^lfsr(3)^lfsr(5), lfsr(width-1,1)) }
+    lfsr
+  }
+}
+// scalastyle:on magic.number
+