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package ChiselTests
import Chisel._
import Chisel.testers._
class Pads extends Module {
val io = new Bundle {
val a = Bits(INPUT, 4)
val asp = Bits(OUTPUT, 8)
val aup = Bits(OUTPUT, 8)
}
io.asp := io.a.toSInt
io.aup := io.a.toUInt
}
class PadsTester(c: Pads) extends Tester(c) {
def pads(x: BigInt, s: Int, w: Int) = {
val sign = (x & (1 << (s-1)))
val wmask = (1 << w) - 1
val bmask = (1 << s) - 1
if (sign == 0) x else ((~bmask | x) & wmask)
}
for (t <- 0 until 16) {
val test_a = rnd.nextInt(1 << 4)
poke(c.io.a, test_a)
step(1)
expect(c.io.asp, pads(test_a, 4, 8))
expect(c.io.aup, test_a)
}
}
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