Merge pull request #1476 from freechipsproject/remove-LFSR16

Move LFSR16 to Compatibility Mode (Deprecated in 3.2)

1 files changed, 0 insertions, 46 deletions

diff --git a/src/main/scala/chisel3/util/LFSR.scala b/src/main/scala/chisel3/util/LFSR.scala
deleted file mode 100644
index 5fc778fb..00000000
--- a/src/main/scala/chisel3/util/LFSR.scala
+++ /dev/null
@@ -1,46 +0,0 @@
-// See LICENSE for license details.
-
-/** LFSRs in all shapes and sizes.
-  */
-
-package chisel3.util
-
-import chisel3._
-import chisel3.internal.naming.chiselName  // can't use chisel3_ version because of compile order
-import chisel3.util.random.FibonacciLFSR
-
-/** LFSR16 generates a 16-bit linear feedback shift register, returning the register contents.
-  * This is useful for generating a pseudo-random sequence.
-  *
-  * The example below, taken from the unit tests, creates two 4-sided dice using `LFSR16` primitives:
-  * @example {{{
-  *   val bins = Reg(Vec(8, UInt(32.W)))
-  *
-  *   // Create two 4 sided dice and roll them each cycle.
-  *   // Use tap points on each LFSR so values are more independent
-  *   val die0 = Cat(Seq.tabulate(2) { i => LFSR16()(i) })
-  *   val die1 = Cat(Seq.tabulate(2) { i => LFSR16()(i + 2) })
-  *
-  *   val rollValue = die0 +& die1  // Note +& is critical because sum will need an extra bit.
-  *
-  *   bins(rollValue) := bins(rollValue) + 1.U
-  *
-  * }}}
-  */
-// scalastyle:off magic.number
-@deprecated("LFSR16 is deprecated in favor of the parameterized chisel3.util.random.LFSR", "3.2")
-object LFSR16 {
-  /** Generates a 16-bit linear feedback shift register, returning the register contents.
-    * @param increment optional control to gate when the LFSR updates.
-    */
-  @deprecated("Use chisel3.util.random.LFSR(16) for a 16-bit LFSR", "3.2")
-  @chiselName
-  def apply(increment: Bool = true.B): UInt =
-    VecInit( FibonacciLFSR
-              .maxPeriod(16, increment, seed = Some(BigInt(1) << 15))
-              .asBools
-              .reverse )
-      .asUInt
-
-}
-// scalastyle:on magic.number