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Chisel

LFSR16

object LFSR16

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:

Source
compatibility.scala
Example: 

  1. 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
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