Packages

  • package root

    This is the documentation for Chisel.

    This is the documentation for Chisel.

    Package structure

    The chisel3 package presents the public API of Chisel. It contains the concrete core types UInt, SInt, Bool, Clock, and Reg, the abstract types Bits, Aggregate, and Data, and the aggregate types Bundle and Vec.

    The Chisel package is a compatibility layer that attempts to provide chisel2 compatibility in chisel3.

    Utility objects and methods are found in the util package.

    The testers package defines the basic interface for chisel testers.

    Definition Classes
    root
  • 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

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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