diff --git a/groundtest/src/main/scala/atostest.scala b/groundtest/src/main/scala/atostest.scala
new file mode 100644
index 00000000..d6be16f1
--- /dev/null
+++ b/groundtest/src/main/scala/atostest.scala
@@ -0,0 +1,135 @@
+package groundtest
+
+import Chisel._
+import junctions._
+import junctions.StreamUtils._
+import cde.Parameters
+
+class AtosConverterTestFrontend(implicit p: Parameters) extends NastiModule()(p) {
+  val io = new Bundle {
+    val nasti = new NastiIO
+    val finished = Bool(OUTPUT)
+  }
+
+  val n_words = 4
+  val test_data = Vec.tabulate(n_words) { i => UInt(i * 48) }
+
+  val (s_idle :: s_waddr :: s_wdata :: s_wresp ::
+       s_raddr :: s_rresp :: s_done :: Nil) = Enum(Bits(), 7)
+  val state = Reg(init = s_idle)
+
+  when (state === s_idle) { state := s_waddr }
+  when (io.nasti.aw.fire()) { state := s_wdata }
+  when (io.nasti.w.fire() && io.nasti.w.bits.last) { state := s_wresp }
+  when (io.nasti.b.fire()) { state := s_raddr }
+  when (io.nasti.ar.fire()) { state := s_rresp }
+  when (io.nasti.r.fire() && io.nasti.r.bits.last) { state := s_done }
+
+  val (w_count, w_last) = Counter(io.nasti.w.fire(), n_words)
+
+  io.nasti.aw.valid := (state === s_waddr)
+  io.nasti.aw.bits := NastiWriteAddressChannel(
+    id = UInt(0),
+    addr = UInt(0),
+    size = UInt(log2Up(nastiXDataBits / 8)),
+    len = UInt(n_words - 1))
+
+  io.nasti.w.valid := (state === s_wdata)
+  io.nasti.w.bits := NastiWriteDataChannel(
+    data = test_data(w_count),
+    last = w_count === UInt(n_words - 1))
+
+  io.nasti.ar.valid := (state === s_raddr)
+  io.nasti.ar.bits := NastiReadAddressChannel(
+    id = UInt(0),
+    addr = UInt(0),
+    size = UInt(log2Up(nastiXDataBits / 8)),
+    len = UInt(n_words - 1))
+
+  io.nasti.b.ready := (state === s_wresp)
+  io.nasti.r.ready := (state === s_rresp)
+
+  io.finished := (state === s_done)
+
+  val (r_count, r_last) = Counter(io.nasti.r.fire(), n_words)
+
+  assert(!io.nasti.r.valid || io.nasti.r.bits.data === test_data(r_count),
+    "AtosConverterTest: returned data doesn't match expected")
+}
+
+class AtosConverterTestBackend(implicit p: Parameters) extends NastiModule()(p) {
+  val io = new Bundle {
+    val nasti = (new NastiIO).flip
+    val finished = Bool(OUTPUT)
+  }
+
+  val (s_waddr :: s_wdata :: s_wresp ::
+       s_raddr :: s_rresp :: s_done :: Nil) = Enum(Bits(), 6)
+  val state = Reg(init = s_waddr)
+
+  val n_words = 4
+  val test_data = Reg(Vec(n_words, UInt(width = nastiXDataBits)))
+  val req_id = Reg(UInt(width = nastiXIdBits))
+
+  val (w_count, w_last) = Counter(io.nasti.w.fire(), n_words)
+  val (r_count, r_last) = Counter(io.nasti.r.fire(), n_words)
+
+  when (io.nasti.aw.fire()) {
+    req_id := io.nasti.aw.bits.id
+    state := s_wdata
+  }
+  when (io.nasti.w.fire()) {
+    test_data(w_count) := io.nasti.w.bits.data
+    when (io.nasti.w.bits.last) { state := s_wresp }
+  }
+  when (io.nasti.b.fire()) { state := s_raddr }
+  when (io.nasti.ar.fire()) {
+    req_id := io.nasti.ar.bits.id
+    state := s_rresp
+  }
+  when (io.nasti.r.fire() && io.nasti.r.bits.last) { state := s_done }
+
+  io.nasti.aw.ready := (state === s_waddr)
+  io.nasti.w.ready := (state === s_wdata)
+  io.nasti.ar.ready := (state === s_raddr)
+
+  io.nasti.b.valid := (state === s_wresp)
+  io.nasti.b.bits := NastiWriteResponseChannel(id = req_id)
+
+  io.nasti.r.valid := (state === s_rresp)
+  io.nasti.r.bits := NastiReadDataChannel(
+    id = req_id,
+    data = test_data(r_count),
+    last = r_last)
+
+  io.finished := (state === s_done)
+}
+
+class AtosConverterTest(implicit p: Parameters) extends GroundTest()(p) {
+  disablePorts()
+
+  val frontend = Module(new AtosConverterTestFrontend)
+  val backend = Module(new AtosConverterTestBackend)
+
+  val fe_ser = Module(new Serializer(new AtosRequest))
+  val fe_des = Module(new Deserializer(new AtosResponse))
+
+  val be_des = Module(new Deserializer(new AtosRequest))
+  val be_ser = Module(new Serializer(new AtosResponse))
+
+  val client_conv = Module(new AtosClientConverter)
+  val manager_conv = Module(new AtosManagerConverter)
+
+  client_conv.io.nasti <> frontend.io.nasti
+  fe_ser.io.in <> client_conv.io.atos.req
+  client_conv.io.atos.resp <> fe_des.io.out
+
+  be_des.io.in <> fe_ser.io.out
+  fe_des.io.in <> be_ser.io.out
+
+  manager_conv.io.atos.req <> be_des.io.out
+  be_ser.io.in <> manager_conv.io.atos.resp
+  backend.io.nasti <> manager_conv.io.nasti
+
+  io.finished := frontend.io.finished && backend.io.finished
+}