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// See LICENSE for license details.
package chiselTests
import Chisel._
import org.scalatest._
import org.scalatest.prop._
import Chisel.testers.BasicTester
class Tbl(w: Int, n: Int) extends Module {
val io = new Bundle {
val wi = UInt(INPUT, log2Up(n))
val ri = UInt(INPUT, log2Up(n))
val we = Bool(INPUT)
val d = UInt(INPUT, w)
val o = UInt(OUTPUT, w)
}
val m = Mem(UInt(width = w), n)
io.o := m(io.ri)
when (io.we) {
m(io.wi) := io.d
when(io.ri === io.wi) {
io.o := io.d
}
}
}
class TblTester(w: Int, n: Int, idxs: List[Int], values: List[Int]) extends BasicTester {
val (cnt, wrap) = Counter(Bool(true), idxs.size)
val dut = Module(new Tbl(w, n))
val vvalues = Vec(values.map(UInt(_)))
val vidxs = Vec(idxs.map(UInt(_)))
val prev_idx = vidxs(cnt - UInt(1))
val prev_value = vvalues(cnt - UInt(1))
dut.io.wi := vidxs(cnt)
dut.io.ri := prev_idx
dut.io.we := Bool(true) //TODO enSequence
dut.io.d := vvalues(cnt)
when (cnt > UInt(0)) {
when (prev_idx === vidxs(cnt)) {
assert(dut.io.o === vvalues(cnt))
} .otherwise {
assert(dut.io.o === prev_value)
}
}
when(wrap) {
stop()
}
}
class TblSpec extends ChiselPropSpec {
property("All table reads should return the previous write") {
forAll(safeUIntPairN(8)) { case(w: Int, pairs: List[(Int, Int)]) =>
require(w > 0)
val (idxs, values) = pairs.unzip
assert(execute{ new TblTester(w, 1 << w, idxs, values) })
}
}
}
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