Testing LFSR solution

// See LICENSE.txt for license details.

// January 21st, 2018	- adapting for Learning Journey

package solutions

import chisel3._

import chisel3.util.Cat

import Chisel._

import Chisel.util.Cat

// Problem:

//

// State change is allowed only when 'inc' is asserted

//

class LFSR16 extends Module {

  val io = IO(new Bundle {

    val inc = Input(Bool())

    val out = Output(UInt(16.W))

  })

  val res = RegInit(1.U(16.W))

  val io = new Bundle {

    val inc = Bool(INPUT)

    val out = UInt(OUTPUT, 16)

  }

  val res = Reg(init = UInt(1, 16))

  when (io.inc) { 

    val nxt_res = Cat(res(0)^res(2)^res(3)^res(5), res(15,1)) 

    res := nxt_res