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// See LICENSE for license details.
package chiselTests
import chisel3._
import chisel3.testers.BasicTester
import chisel3.util._
class LFSR16 extends Module {
val io = IO(new Bundle {
val inc = Input(Bool())
val out = Output(UInt.width(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
}
io.out := res
}
/*
class LFSR16Tester(c: LFSR16) extends Tester(c) {
var res = 1
for (t <- 0 until 16) {
val inc = rnd.nextInt(2)
poke(c.io.inc, inc)
step(1)
if (inc == 1) {
val bit = ((res >> 0) ^ (res >> 2) ^ (res >> 3) ^ (res >> 5) ) & 1;
res = (res >> 1) | (bit << 15);
}
expect(c.io.out, res)
}
}
*/
//TODO: Use chisel3.util version instead?
class LFSRSpec extends ChiselPropSpec {
property("LFSR16 should elaborate") {
elaborate { new LFSR16 }
}
ignore("LFSR16 should return the correct result") { }
}
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