chisel6.4.0 < Back
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# Packages

-  package root
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-  package chisel3

  This package contains the main chisel3 API.

  This package contains the main chisel3 API.

  Definition Classes
    root
-  package util

  The util package provides extensions to core chisel for common hardware components and utility functions

  The util package provides extensions to core chisel for common hardware components and utility functions

  Definition Classes
    chisel3
-  package random
  Definition Classes
    util
- FibonacciLFSR
- GaloisLFSR
- LFSR
- LFSRReduce
- MaxPeriodFibonacciLFSR
- MaxPeriodGaloisLFSR
- PRNG
- PRNGIO
- XNOR
- XOR

o

chisel3.util.random

# LFSR

###
Companion trait LFSR

#### object LFSR

Utilities related to psuedorandom number generation using Linear Feedback Shift Registers (LFSRs).

For example, to generate a pseudorandom 16-bit UInt that changes every cycle, you can use:

    val pseudoRandomNumber = LFSR(16)

Source
  LFSR.scala

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4.  def apply(width: Int, increment: Bool = true.B, seed: Option[BigInt] = Some(1)): UInt

   Return a pseudorandom UInt generated using a FibonacciLFSR.

   Return a pseudorandom UInt generated using a FibonacciLFSR. If you require a Galois LFSR, use GaloisLFSR.maxPeriod.

   width

     the width of the LFSR

   increment

     when asserted, the LFSR will increment

   seed

     an initial seed (this cannot be zero)

   returns

     a UInt that is the output of a maximal period LFSR of the requested width

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17.  lazy val tapsMaxPeriod: Map[Int, Seq[Set[Int]]]

    A mapping of widths to a sequence of known LFSR taps that produce a maximal period LFSR.

    A mapping of widths to a sequence of known LFSR taps that produce a maximal period LFSR. These work for either a Fibonacci LFSR or a Galois LFSR. Taps are available for bit widths of 2--786, 1024, 2048, and 4096.

    Users can automatically generate LFSRs using these taps with LFSR.apply for a maximum period Fibonacci XOR LFSR or with MaxPeriodGaloisLFSR/GaloisLFSR.maxPeriod or MaxPeriodFibonacciLFSR/FibonacciLFSR.maxPeriod for more configuration options.

    See also

      http://courses.cse.tamu.edu/walker/csce680/lfsr_table.pdf

      https://www.xilinx.com/support/documentation/application_notes/xapp052.pdf

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