text: #!/usr/bin/env python
  """
  
  Copyright (c) 2020 Alex Forencich
  
  Permission is hereby granted, free of charge, to any person obtaining a copy
  of this software and associated documentation files (the "Software"), to deal
  in the Software without restriction, including without limitation the rights
  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  copies of the Software, and to permit persons to whom the Software is
  furnished to do so, subject to the following conditions:
  
  The above copyright notice and this permission notice shall be included in
  all copies or substantial portions of the Software.
  
  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY
  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  THE SOFTWARE.
  
  """
  
  from myhdl import *
  import os
  
  import axis_ep
  
  module = 'axis_ram_switch'
  testbench = 'test_%s_4x4_64_64' % module
  
  srcs = []
  
  srcs.append("../rtl/%s.v" % module)
  srcs.append("../rtl/axis_adapter.v")
  srcs.append("../rtl/arbiter.v")
  srcs.append("../rtl/priority_encoder.v")
  srcs.append("%s.v" % testbench)
  
  src = ' '.join(srcs)
  
  build_cmd = "iverilog -o %s.vvp %s" % (testbench, src)
  
  def bench():
  
      # Parameters
      FIFO_DEPTH = 512
      SPEEDUP = 0
      S_COUNT = 4
      M_COUNT = 4
      S_DATA_WIDTH = 64
      S_KEEP_ENABLE = (S_DATA_WIDTH>8)
      S_KEEP_WIDTH = (S_DATA_WIDTH/8)
      M_DATA_WIDTH = 64
      M_KEEP_ENABLE = (M_DATA_WIDTH>8)
      M_KEEP_WIDTH = (M_DATA_WIDTH/8)
      ID_ENABLE = 1
      ID_WIDTH = 8
      DEST_WIDTH = (M_COUNT+1-1).bit_length()
      USER_ENABLE = 1
      USER_WIDTH = 1
      USER_BAD_FRAME_VALUE = 1
      USER_BAD_FRAME_MASK = 1
      DROP_BAD_FRAME = 1
      DROP_WHEN_FULL = 0
      M_BASE = [0, 1, 2, 3]
      M_TOP = [0, 1, 2, 3]
      M_CONNECT = [0b1111]*M_COUNT
      ARB_TYPE = "ROUND_ROBIN"
      LSB_PRIORITY = "HIGH"
  
      # Inputs
      clk = Signal(bool(0))
      rst = Signal(bool(0))
      current_test = Signal(intbv(0)[8:])
  
      s_axis_tdata_list = [Signal(intbv(0)[S_DATA_WIDTH:]) for i in range(S_COUNT)]
      s_axis_tkeep_list = [Signal(intbv(1)[S_KEEP_WIDTH:]) for i in range(S_COUNT)]
      s_axis_tvalid_list = [Signal(bool(0)) for i in range(S_COUNT)]
      s_axis_tlast_list = [Signal(bool(0)) for i in range(S_COUNT)]
      s_axis_tid_list = [Signal(intbv(0)[ID_WIDTH:]) for i in range(S_COUNT)]
      s_axis_tdest_list = [Signal(intbv(0)[DEST_WIDTH:]) for i in range(S_COUNT)]
      s_axis_tuser_list = [Signal(intbv(0)[USER_WIDTH:]) for i in range(S_COUNT)]
  
      s_axis_tdata = ConcatSignal(*reversed(s_axis_tdata_list))
      s_axis_tkeep = ConcatSignal(*reversed(s_axis_tkeep_list))
      s_axis_tvalid = ConcatSignal(*reversed(s_axis_tvalid_list))
      s_axis_tlast = ConcatSignal(*reversed(s_axis_tlast_list))
      s_axis_tid = ConcatSignal(*reversed(s_axis_tid_list))
      s_axis_tdest = ConcatSignal(*reversed(s_axis_tdest_list))
      s_axis_tuser = ConcatSignal(*reversed(s_axis_tuser_list))
  
      m_axis_tready_list = [Signal(bool(0)) for i in range(M_COUNT)]
  
      m_axis_tready = ConcatSignal(*reversed(m_axis_tready_list))
  
      # Outputs
      s_axis_tready = Signal(intbv(0)[S_COUNT:])
  
      s_axis_tready_list = [s_axis_tready(i) for i in range(S_COUNT)]
  
      m_axis_tdata = Signal(intbv(0)[M_COUNT*M_DATA_WIDTH:])
      m_axis_tkeep = Signal(intbv(0xf)[M_COUNT*M_KEEP_WIDTH:])
      m_axis_tvalid = Signal(intbv(0)[M_COUNT:])
      m_axis_tlast = Signal(intbv(0)[M_COUNT:])
      m_axis_tid = Signal(intbv(0)[M_COUNT*ID_WIDTH:])
      m_axis_tdest = Signal(intbv(0)[M_COUNT*DEST_WIDTH:])
      m_axis_tuser = Signal(intbv(0)[M_COUNT*USER_WIDTH:])
  
      m_axis_tdata_list = [m_axis_tdata((i+1)*M_DATA_WIDTH, i*M_DATA_WIDTH) for i in range(M_COUNT)]
      m_axis_tkeep_list = [m_axis_tkeep((i+1)*M_KEEP_WIDTH, i*M_KEEP_WIDTH) for i in range(M_COUNT)]
      m_axis_tvalid_list = [m_axis_tvalid(i) for i in range(M_COUNT)]
      m_axis_tlast_list = [m_axis_tlast(i) for i in range(M_COUNT)]
      m_axis_tid_list = [m_axis_tid((i+1)*ID_WIDTH, i*ID_WIDTH) for i in range(M_COUNT)]
      m_axis_tdest_list = [m_axis_tdest((i+1)*DEST_WIDTH, i*DEST_WIDTH) for i in range(M_COUNT)]
      m_axis_tuser_list = [m_axis_tuser((i+1)*USER_WIDTH, i*USER_WIDTH) for i in range(M_COUNT)]
  
      status_overflow = Signal(intbv(0)[S_COUNT:])
      status_bad_frame = Signal(intbv(0)[S_COUNT:])
      status_good_frame = Signal(intbv(0)[S_COUNT:])
  
      # sources and sinks
      source_pause_list = []
      source_list = []
      source_logic_list = []
      sink_pause_list = []
      sink_list = []
      sink_logic_list = []
  
      for k in range(S_COUNT):
          s = axis_ep.AXIStreamSource()
          p = Signal(bool(0))
  
          source_list.append(s)
          source_pause_list.append(p)
  
          source_logic_list.append(s.create_logic(
              clk,
              rst,
              tdata=s_axis_tdata_list[k],
              tkeep=s_axis_tkeep_list[k],
              tvalid=s_axis_tvalid_list[k],
              tready=s_axis_tready_list[k],
              tlast=s_axis_tlast_list[k],
              tid=s_axis_tid_list[k],
              tdest=s_axis_tdest_list[k],
              tuser=s_axis_tuser_list[k],
              pause=p,
              name='source_%d' % k
          ))
  
      for k in range(M_COUNT):
          s = axis_ep.AXIStreamSink()
          p = Signal(bool(0))
  
          sink_list.append(s)
          sink_pause_list.append(p)
  
          sink_logic_list.append(s.create_logic(
              clk,
              rst,
              tdata=m_axis_tdata_list[k],
              tkeep=m_axis_tkeep_list[k],
              tvalid=m_axis_tvalid_list[k],
              tready=m_axis_tready_list[k],
              tlast=m_axis_tlast_list[k],
              tid=m_axis_tid_list[k],
              tdest=m_axis_tdest_list[k],
              tuser=m_axis_tuser_list[k],
              pause=p,
              name='sink_%d' % k
          ))
  
      # DUT
      if os.system(build_cmd):
          raise Exception("Error running build command")
  
      dut = Cosimulation(
          "vvp -m myhdl %s.vvp -lxt2" % testbench,
          clk=clk,
          rst=rst,
          current_test=current_test,
  
          s_axis_tdata=s_axis_tdata,
          s_axis_tkeep=s_axis_tkeep,
          s_axis_tvalid=s_axis_tvalid,
          s_axis_tready=s_axis_tready,
          s_axis_tlast=s_axis_tlast,
          s_axis_tid=s_axis_tid,
          s_axis_tdest=s_axis_tdest,
          s_axis_tuser=s_axis_tuser,
  
          m_axis_tdata=m_axis_tdata,
          m_axis_tkeep=m_axis_tkeep,
          m_axis_tvalid=m_axis_tvalid,
          m_axis_tready=m_axis_tready,
          m_axis_tlast=m_axis_tlast,
          m_axis_tid=m_axis_tid,
          m_axis_tdest=m_axis_tdest,
          m_axis_tuser=m_axis_tuser,
  
          status_overflow=status_overflow,
          status_bad_frame=status_bad_frame,
          status_good_frame=status_good_frame
      )
  
      @always(delay(4))
      def clkgen():
          clk.next = not clk
  
      status_overflow_latch = Signal(intbv(0)[S_COUNT:])
      status_bad_frame_latch = Signal(intbv(0)[S_COUNT:])
      status_good_frame_latch = Signal(intbv(0)[S_COUNT:])
  
      @always(clk.posedge)
      def monitor():
          if status_overflow:
              status_overflow_latch.next = status_overflow_latch | status_overflow
          if status_bad_frame:
              status_bad_frame_latch.next = status_bad_frame_latch | status_bad_frame
          if status_good_frame:
              status_good_frame_latch.next = status_good_frame_latch | status_good_frame
  
      def wait_normal():
          while s_axis_tvalid:
              yield clk.posedge
  
      def wait_pause_source():
          while s_axis_tvalid:
              yield clk.posedge
              yield clk.posedge
              for k in range(S_COUNT):
                  source_pause_list[k].next = False
              yield clk.posedge
              for k in range(S_COUNT):
                  source_pause_list[k].next = True
              yield clk.posedge
  
          for k in range(S_COUNT):
              source_pause_list[k].next = False
  
      def wait_pause_sink():
          while s_axis_tvalid:
              for k in range(M_COUNT):
                  sink_pause_list[k].next = True
              yield clk.posedge
              yield clk.posedge
              yield clk.posedge
              for k in range(M_COUNT):
                  sink_pause_list[k].next = False
              yield clk.posedge
  
      @instance
      def check():
          yield delay(100)
          yield clk.posedge
          rst.next = 1
          yield clk.posedge
          rst.next = 0
          yield clk.posedge
          yield delay(100)
          yield clk.posedge
  
          # testbench stimulus
  
          yield clk.posedge
          print("test 1: 0123 -> 0123")
          current_test.next = 1
  
          test_frame0 = axis_ep.AXIStreamFrame(b'\x01\x00\x00\xFF'+bytearray(range(256)), id=0, dest=0)
          test_frame1 = axis_ep.AXIStreamFrame(b'\x01\x01\x01\xFF'+bytearray(range(256)), id=1, dest=1)
          test_frame2 = axis_ep.AXIStreamFrame(b'\x01\x02\x02\xFF'+bytearray(range(256)), id=2, dest=2)
          test_frame3 = axis_ep.AXIStreamFrame(b'\x01\x03\x03\xFF'+bytearray(range(256)), id=3, dest=3)
  
          for wait in wait_normal, wait_pause_source, wait_pause_sink:
              status_overflow_latch.next = 0
              status_bad_frame_latch.next = 0
              status_good_frame_latch.next = 0
  
              source_list[0].send(test_frame0)
              source_list[1].send(test_frame1)
              source_list[2].send(test_frame2)
              source_list[3].send(test_frame3)
              yield clk.posedge
              yield clk.posedge
  
              yield wait()
  
              yield sink_list[0].wait()
              rx_frame0 = sink_list[0].recv()
  
              assert rx_frame0 == test_frame0
  
              yield sink_list[1].wait()
              rx_frame1 = sink_list[1].recv()
  
              assert rx_frame1 == test_frame1
  
              yield sink_list[2].wait()
              rx_frame2 = sink_list[2].recv()
  
              assert rx_frame2 == test_frame2
  
              yield sink_list[3].wait()
              rx_frame3 = sink_list[3].recv()
  
              assert rx_frame3 == test_frame3
  
              assert sink_list[0].empty()
              assert sink_list[1].empty()
              assert sink_list[2].empty()
              assert sink_list[3].empty()
  
              assert status_overflow_latch == 0x0
              assert status_bad_frame_latch == 0x0
              assert status_good_frame_latch == 0xf
  
              yield delay(100)
  
          yield clk.posedge
          print("test 2: 0123 -> 3210")
          current_test.next = 2
  
          test_frame0 = axis_ep.AXIStreamFrame(b'\x02\x00\x03\xFF'+bytearray(range(256)), id=0, dest=3)
          test_frame1 = axis_ep.AXIStreamFrame(b'\x02\x01\x02\xFF'+bytearray(range(256)), id=1, dest=2)
          test_frame2 = axis_ep.AXIStreamFrame(b'\x02\x02\x01\xFF'+bytearray(range(256)), id=2, dest=1)
          test_frame3 = axis_ep.AXIStreamFrame(b'\x02\x03\x00\xFF'+bytearray(range(256)), id=3, dest=0)
  
          for wait in wait_normal, wait_pause_source, wait_pause_sink:
              status_overflow_latch.next = 0
              status_bad_frame_latch.next = 0
              status_good_frame_latch.next = 0
  
              source_list[0].send(test_frame0)
              source_list[1].send(test_frame1)
              source_list[2].send(test_frame2)
              source_list[3].send(test_frame3)
              yield clk.posedge
              yield clk.posedge
  
              yield wait()
  
              yield sink_list[0].wait()
              rx_frame0 = sink_list[0].recv()
  
              assert rx_frame0 == test_frame3
  
              yield sink_list[1].wait()
              rx_frame1 = sink_list[1].recv()
  
              assert rx_frame1 == test_frame2
  
              yield sink_list[2].wait()
              rx_frame2 = sink_list[2].recv()
  
              assert rx_frame2 == test_frame1
  
              yield sink_list[3].wait()
              rx_frame3 = sink_list[3].recv()
  
              assert rx_frame3 == test_frame0
  
              assert sink_list[0].empty()
              assert sink_list[1].empty()
              assert sink_list[2].empty()
              assert sink_list[3].empty()
  
              assert status_overflow_latch == 0x0
              assert status_bad_frame_latch == 0x0
              assert status_good_frame_latch == 0xf
  
              yield delay(100)
  
          yield clk.posedge
          print("test 3: 0000 -> 0123")
          current_test.next = 3
  
          test_frame0 = axis_ep.AXIStreamFrame(b'\x03\x00\x00\xFF'+bytearray(range(256)), id=0, dest=0)
          test_frame1 = axis_ep.AXIStreamFrame(b'\x03\x00\x01\xFF'+bytearray(range(256)), id=0, dest=1)
          test_frame2 = axis_ep.AXIStreamFrame(b'\x03\x00\x02\xFF'+bytearray(range(256)), id=0, dest=2)
          test_frame3 = axis_ep.AXIStreamFrame(b'\x03\x00\x03\xFF'+bytearray(range(256)), id=0, dest=3)
  
          for wait in wait_normal, wait_pause_source, wait_pause_sink:
              status_overflow_latch.next = 0
              status_bad_frame_latch.next = 0
              status_good_frame_latch.next = 0
  
              source_list[0].send(test_frame0)
              source_list[0].send(test_frame1)
              source_list[0].send(test_frame2)
              source_list[0].send(test_frame3)
              yield clk.posedge
              yield clk.posedge
  
              yield wait()
  
              yield sink_list[0].wait()
              rx_frame0 = sink_list[0].recv()
  
              assert rx_frame0 == test_frame0
  
              yield sink_list[1].wait()
              rx_frame1 = sink_list[1].recv()
  
              assert rx_frame1 == test_frame1
  
              yield sink_list[2].wait()
              rx_frame2 = sink_list[2].recv()
  
              assert rx_frame2 == test_frame2
  
              yield sink_list[3].wait()
              rx_frame3 = sink_list[3].recv()
  
              assert rx_frame3 == test_frame3
  
              assert sink_list[0].empty()
              assert sink_list[1].empty()
              assert sink_list[2].empty()
              assert sink_list[3].empty()
  
              assert status_overflow_latch == 0x0
              assert status_bad_frame_latch == 0x0
              assert status_good_frame_latch == 0x1
  
              yield delay(100)
  
          yield clk.posedge
          print("test 4: 0123 -> 0000")
          current_test.next = 4
  
          test_frame0 = axis_ep.AXIStreamFrame(b'\x04\x00\x00\xFF'+bytearray(range(256)), id=0, dest=0)
          test_frame1 = axis_ep.AXIStreamFrame(b'\x04\x01\x00\xFF'+bytearray(range(256)), id=1, dest=0)
          test_frame2 = axis_ep.AXIStreamFrame(b'\x04\x02\x00\xFF'+bytearray(range(256)), id=2, dest=0)
          test_frame3 = axis_ep.AXIStreamFrame(b'\x04\x03\x00\xFF'+bytearray(range(256)), id=3, dest=0)
  
          for wait in wait_normal, wait_pause_source, wait_pause_sink:
              status_overflow_latch.next = 0
              status_bad_frame_latch.next = 0
              status_good_frame_latch.next = 0
  
              source_list[0].send(test_frame0)
              yield clk.posedge
              source_list[1].send(test_frame1)
              source_list[2].send(test_frame2)
              source_list[3].send(test_frame3)
              yield clk.posedge
  
              yield wait()
  
              yield sink_list[0].wait()
              rx_frame0 = sink_list[0].recv()
  
              assert rx_frame0 == test_frame0
  
              yield sink_list[0].wait()
              rx_frame1 = sink_list[0].recv()
  
              assert rx_frame1 == test_frame1
  
              yield sink_list[0].wait()
              rx_frame2 = sink_list[0].recv()
  
              assert rx_frame2 == test_frame2
  
              yield sink_list[0].wait()
              rx_frame3 = sink_list[0].recv()
  
              assert rx_frame3 == test_frame3
  
              assert sink_list[0].empty()
              assert sink_list[1].empty()
              assert sink_list[2].empty()
              assert sink_list[3].empty()
  
              assert status_overflow_latch == 0x0
              assert status_bad_frame_latch == 0x0
              assert status_good_frame_latch == 0xf
  
              yield delay(100)
  
          yield clk.posedge
          print("test 5: 0000 -> 0000")
          current_test.next = 5
  
          test_frame0 = axis_ep.AXIStreamFrame(b'\x05\x00\x00\xFF'+bytearray(range(256)), id=0, dest=0)
          test_frame1 = axis_ep.AXIStreamFrame(b'\x05\x00\x00\xFF'+bytearray(range(256)), id=0, dest=0)
          test_frame2 = axis_ep.AXIStreamFrame(b'\x05\x00\x00\xFF'+bytearray(range(256)), id=0, dest=0)
          test_frame3 = axis_ep.AXIStreamFrame(b'\x05\x00\x00\xFF'+bytearray(range(256)), id=0, dest=0)
  
          for wait in wait_normal, wait_pause_source, wait_pause_sink:
              status_overflow_latch.next = 0
              status_bad_frame_latch.next = 0
              status_good_frame_latch.next = 0
  
              source_list[0].send(test_frame0)
              source_list[0].send(test_frame1)
              source_list[0].send(test_frame2)
              source_list[0].send(test_frame3)
              yield clk.posedge
              yield clk.posedge
  
              yield wait()
  
              yield sink_list[0].wait()
              rx_frame0 = sink_list[0].recv()
  
              assert rx_frame0 == test_frame0
  
              yield sink_list[0].wait()
              rx_frame1 = sink_list[0].recv()
  
              assert rx_frame1 == test_frame1
  
              yield sink_list[0].wait()
              rx_frame2 = sink_list[0].recv()
  
              assert rx_frame2 == test_frame2
  
              yield sink_list[0].wait()
              rx_frame3 = sink_list[0].recv()
  
              assert rx_frame3 == test_frame3
  
              assert sink_list[0].empty()
              assert sink_list[1].empty()
              assert sink_list[2].empty()
              assert sink_list[3].empty()
  
              assert status_overflow_latch == 0x0
              assert status_bad_frame_latch == 0x0
              assert status_good_frame_latch == 0x1
  
              yield delay(100)
  
          yield clk.posedge
          print("test 6: bad decoding")
          current_test.next = 6
  
          test_frame0 = axis_ep.AXIStreamFrame(b'\x06\x00\x00\xFF'+bytearray(range(256)), id=0, dest=0)
          test_frame1 = axis_ep.AXIStreamFrame(b'\x06\x01\x01\xFF'+bytearray(range(256)), id=1, dest=1)
          test_frame2 = axis_ep.AXIStreamFrame(b'\x06\x02\x04\xFF'+bytearray(range(256)), id=2, dest=4)
          test_frame3 = axis_ep.AXIStreamFrame(b'\x06\x03\x05\xFF'+bytearray(range(256)), id=3, dest=5)
  
          for wait in wait_normal, wait_pause_source, wait_pause_sink:
              status_overflow_latch.next = 0
              status_bad_frame_latch.next = 0
              status_good_frame_latch.next = 0
  
              source_list[0].send(test_frame0)
              source_list[1].send(test_frame1)
              source_list[2].send(test_frame2)
              source_list[3].send(test_frame3)
              yield clk.posedge
              yield clk.posedge
  
              yield wait()
  
              yield sink_list[0].wait()
              rx_frame0 = sink_list[0].recv()
  
              assert rx_frame0 == test_frame0
  
              yield sink_list[1].wait()
              rx_frame1 = sink_list[1].recv()
  
              assert rx_frame1 == test_frame1
  
              assert sink_list[0].empty()
              assert sink_list[1].empty()
              assert sink_list[2].empty()
              assert sink_list[3].empty()
  
              assert status_overflow_latch == 0x0
              assert status_bad_frame_latch == 0x0
              assert status_good_frame_latch == 0x3
  
              yield delay(100)
  
          yield clk.posedge
          print("test 7: tuser assert")
          current_test.next = 7
  
          test_frame0 = axis_ep.AXIStreamFrame(b'\x07\x00\x00\xFF'+bytearray(range(256)), id=0, dest=0)
          test_frame1 = axis_ep.AXIStreamFrame(b'\x07\x00\x01\xFF'+bytearray(range(256)), id=0, dest=1, last_cycle_user=1)
          test_frame2 = axis_ep.AXIStreamFrame(b'\x07\x00\x02\xFF'+bytearray(range(256)), id=0, dest=2)
          test_frame3 = axis_ep.AXIStreamFrame(b'\x07\x00\x03\xFF'+bytearray(range(256)), id=0, dest=3)
  
          for wait in wait_normal, wait_pause_source, wait_pause_sink:
              status_overflow_latch.next = 0
              status_bad_frame_latch.next = 0
              status_good_frame_latch.next = 0
  
              source_list[0].send(test_frame0)
              source_list[0].send(test_frame1)
              source_list[0].send(test_frame2)
              source_list[0].send(test_frame3)
              yield clk.posedge
              yield clk.posedge
  
              yield wait()
  
              yield sink_list[0].wait()
              rx_frame0 = sink_list[0].recv()
  
              assert rx_frame0 == test_frame0
  
              yield sink_list[2].wait()
              rx_frame2 = sink_list[2].recv()
  
              assert rx_frame2 == test_frame2
  
              yield sink_list[3].wait()
              rx_frame3 = sink_list[3].recv()
  
              assert rx_frame3 == test_frame3
  
              assert sink_list[0].empty()
              assert sink_list[1].empty()
              assert sink_list[2].empty()
              assert sink_list[3].empty()
  
              assert status_overflow_latch == 0x0
              assert status_bad_frame_latch == 0x1
              assert status_good_frame_latch == 0x1
  
              yield delay(100)
  
          yield clk.posedge
          print("test 8: single packet overflow")
          current_test.next = 8
  
          test_frame0 = axis_ep.AXIStreamFrame(b'\x08\x00\x00\xFF'+bytearray(range(256))*3, id=0, dest=0)
          test_frame1 = axis_ep.AXIStreamFrame(b'\x08\x01\x01\xFF'+bytearray(range(256))*3, id=1, dest=1)
          test_frame2 = axis_ep.AXIStreamFrame(b'\x08\x02\x02\xFF'+bytearray(range(256))*3, id=2, dest=2)
          test_frame3 = axis_ep.AXIStreamFrame(b'\x08\x03\x03\xFF'+bytearray(range(256))*3, id=3, dest=3)
  
          for wait in wait_normal, wait_pause_source, wait_pause_sink:
              status_overflow_latch.next = 0
              status_bad_frame_latch.next = 0
              status_good_frame_latch.next = 0
  
              source_list[0].send(test_frame0)
              source_list[1].send(test_frame1)
              source_list[2].send(test_frame2)
              source_list[3].send(test_frame3)
              yield clk.posedge
              yield clk.posedge
  
              yield wait()
  
              yield delay(100)
  
              assert sink_list[0].empty()
              assert sink_list[1].empty()
              assert sink_list[2].empty()
              assert sink_list[3].empty()
  
              assert status_overflow_latch == 0xf
              assert status_bad_frame_latch == 0x0
              assert status_good_frame_latch == 0x0
  
              yield delay(100)
  
          yield clk.posedge
          print("test 9: initial sink pause")
          current_test.next = 9
  
          test_frame0 = axis_ep.AXIStreamFrame(b'\x09\x00\x00\xFF'+bytearray(range(256)), id=0, dest=0)
          test_frame1 = axis_ep.AXIStreamFrame(b'\x09\x01\x01\xFF'+bytearray(range(256)), id=1, dest=1)
          test_frame2 = axis_ep.AXIStreamFrame(b'\x09\x02\x02\xFF'+bytearray(range(256)), id=2, dest=2)
          test_frame3 = axis_ep.AXIStreamFrame(b'\x09\x03\x03\xFF'+bytearray(range(256)), id=3, dest=3)
  
          status_overflow_latch.next = 0
          status_bad_frame_latch.next = 0
          status_good_frame_latch.next = 0
  
          source_list[0].send(test_frame0)
          source_list[1].send(test_frame1)
          source_list[2].send(test_frame2)
          source_list[3].send(test_frame3)
  
          for k in range(M_COUNT):
              sink_pause_list[k].next = True
  
          yield clk.posedge
          yield clk.posedge
          while (s_axis_tvalid):
              yield clk.posedge
          for k in range(20):
              yield clk.posedge
  
          for k in range(M_COUNT):
              sink_pause_list[k].next = False
  
          yield wait_normal()
  
          yield sink_list[0].wait()
          rx_frame0 = sink_list[0].recv()
  
          assert rx_frame0 == test_frame0
  
          yield sink_list[1].wait()
          rx_frame1 = sink_list[1].recv()
  
          assert rx_frame1 == test_frame1
  
          yield sink_list[2].wait()
          rx_frame2 = sink_list[2].recv()
  
          assert rx_frame2 == test_frame2
  
          yield sink_list[3].wait()
          rx_frame3 = sink_list[3].recv()
  
          assert rx_frame3 == test_frame3
  
          assert sink_list[0].empty()
          assert sink_list[1].empty()
          assert sink_list[2].empty()
          assert sink_list[3].empty()
  
          assert status_overflow_latch == 0x0
          assert status_bad_frame_latch == 0x0
          assert status_good_frame_latch == 0xf
  
          yield delay(100)
  
          yield clk.posedge
          print("test 10: initial sink pause, reset")
          current_test.next = 10
  
          test_frame0 = axis_ep.AXIStreamFrame(b'\x0A\x00\x00\xFF'+bytearray(range(256)), id=0, dest=0)
          test_frame1 = axis_ep.AXIStreamFrame(b'\x0A\x01\x01\xFF'+bytearray(range(256)), id=1, dest=1)
          test_frame2 = axis_ep.AXIStreamFrame(b'\x0A\x02\x02\xFF'+bytearray(range(256)), id=2, dest=2)
          test_frame3 = axis_ep.AXIStreamFrame(b'\x0A\x03\x03\xFF'+bytearray(range(256)), id=3, dest=3)
  
          status_overflow_latch.next = 0
          status_bad_frame_latch.next = 0
          status_good_frame_latch.next = 0
  
          source_list[0].send(test_frame0)
          source_list[1].send(test_frame1)
          source_list[2].send(test_frame2)
          source_list[3].send(test_frame3)
          
          for k in range(M_COUNT):
              sink_pause_list[k].next = True
          
          yield clk.posedge
          yield clk.posedge
          while (s_axis_tvalid):
              yield clk.posedge
          for k in range(20):
              yield clk.posedge
  
          rst.next = 1
          yield clk.posedge
          rst.next = 0
  
          for k in range(M_COUNT):
              sink_pause_list[k].next = False
  
          yield delay(500)
  
          assert sink_list[0].empty()
          assert sink_list[1].empty()
          assert sink_list[2].empty()
          assert sink_list[3].empty()
  
          assert status_overflow_latch == 0x0
          assert status_bad_frame_latch == 0x0
          assert status_good_frame_latch == 0xf
  
          yield delay(100)
  
          yield clk.posedge
          print("test 11: backpressure test")
          current_test.next = 11
  
          test_frame0 = axis_ep.AXIStreamFrame(b'\x0B\x00\x00\xFF'+bytearray(range(256)), id=0, dest=0)
          test_frame1 = axis_ep.AXIStreamFrame(b'\x0B\x00\x00\xFF'+bytearray(range(256)), id=0, dest=0)
          test_frame2 = axis_ep.AXIStreamFrame(b'\x0B\x00\x00\xFF'+bytearray(range(256)), id=0, dest=0)
          test_frame3 = axis_ep.AXIStreamFrame(b'\x0B\x00\x00\xFF'+bytearray(range(256)), id=0, dest=0)
  
          for wait in wait_normal, wait_pause_source, wait_pause_sink:
              status_overflow_latch.next = 0
              status_bad_frame_latch.next = 0
              status_good_frame_latch.next = 0
  
              source_list[0].send(test_frame0)
              source_list[0].send(test_frame1)
              source_list[0].send(test_frame2)
              source_list[0].send(test_frame3)
  
              for k in range(M_COUNT):
                  sink_pause_list[k].next = True
  
              for k in range(100):
                  yield clk.posedge
  
              for k in range(M_COUNT):
                  sink_pause_list[k].next = False
  
              yield wait()
  
              yield sink_list[0].wait()
              rx_frame0 = sink_list[0].recv()
  
              assert rx_frame0 == test_frame0
  
              yield sink_list[0].wait()
              rx_frame1 = sink_list[0].recv()
  
              assert rx_frame1 == test_frame1
  
              yield sink_list[0].wait()
              rx_frame2 = sink_list[0].recv()
  
              assert rx_frame2 == test_frame2
  
              yield sink_list[0].wait()
              rx_frame3 = sink_list[0].recv()
  
              assert rx_frame3 == test_frame3
  
              assert sink_list[0].empty()
              assert sink_list[1].empty()
              assert sink_list[2].empty()
              assert sink_list[3].empty()
  
              assert status_overflow_latch == 0x0
              assert status_bad_frame_latch == 0x0
              assert status_good_frame_latch == 0x1
  
              yield delay(100)
  
          yield clk.posedge
          print("test 12: many small packets, one to one parallel")
          current_test.next = 12
  
          test_frame0 = axis_ep.AXIStreamFrame(b'\x0C\x00\x00\xFF'+bytearray(range(4)), id=0, dest=0)
          test_frame1 = axis_ep.AXIStreamFrame(b'\x0C\x01\x01\xFF'+bytearray(range(4)), id=1, dest=1)
          test_frame2 = axis_ep.AXIStreamFrame(b'\x0C\x02\x02\xFF'+bytearray(range(4)), id=2, dest=2)
          test_frame3 = axis_ep.AXIStreamFrame(b'\x0C\x03\x03\xFF'+bytearray(range(4)), id=3, dest=3)
  
          for wait in wait_normal, wait_pause_source, wait_pause_sink:
              status_overflow_latch.next = 0
              status_bad_frame_latch.next = 0
              status_good_frame_latch.next = 0
  
              for k in range(64):
                  source_list[0].send(test_frame0)
                  source_list[1].send(test_frame1)
                  source_list[2].send(test_frame2)
                  source_list[3].send(test_frame3)
              yield clk.posedge
              yield clk.posedge
  
              yield wait()
  
              for k in range(64):
                  yield sink_list[0].wait()
                  rx_frame0 = sink_list[0].recv()
  
                  assert rx_frame0 == test_frame0
  
                  yield sink_list[1].wait()
                  rx_frame1 = sink_list[1].recv()
  
                  assert rx_frame1 == test_frame1
  
                  yield sink_list[2].wait()
                  rx_frame2 = sink_list[2].recv()
  
                  assert rx_frame2 == test_frame2
  
                  yield sink_list[3].wait()
                  rx_frame3 = sink_list[3].recv()
  
                  assert rx_frame3 == test_frame3
  
              assert sink_list[0].empty()
              assert sink_list[1].empty()
              assert sink_list[2].empty()
              assert sink_list[3].empty()
  
              assert status_overflow_latch == 0x0
              assert status_bad_frame_latch == 0x0
              assert status_good_frame_latch == 0xf
  
              yield delay(100)
  
          yield clk.posedge
          print("test 13: many small packets, many to one")
          current_test.next = 13
  
          test_frame0 = axis_ep.AXIStreamFrame(b'\x0D\x00\x00\xFF'+bytearray(range(4)), id=0, dest=0)
          test_frame1 = axis_ep.AXIStreamFrame(b'\x0D\x01\x00\xFF'+bytearray(range(4)), id=1, dest=0)
          test_frame2 = axis_ep.AXIStreamFrame(b'\x0D\x02\x00\xFF'+bytearray(range(4)), id=2, dest=0)
          test_frame3 = axis_ep.AXIStreamFrame(b'\x0D\x03\x00\xFF'+bytearray(range(4)), id=3, dest=0)
  
          for wait in wait_normal, wait_pause_source, wait_pause_sink:
              status_overflow_latch.next = 0
              status_bad_frame_latch.next = 0
              status_good_frame_latch.next = 0
  
              for k in range(64):
                  source_list[0].send(test_frame0)
                  yield clk.posedge
                  yield clk.posedge
                  source_list[1].send(test_frame1)
                  source_list[2].send(test_frame2)
                  source_list[3].send(test_frame3)
              yield clk.posedge
              yield clk.posedge
  
              yield wait()
  
              for k in range(64):
                  yield sink_list[0].wait()
                  rx_frame0 = sink_list[0].recv()
  
                  assert rx_frame0 == test_frame0
  
                  yield sink_list[0].wait()
                  rx_frame1 = sink_list[0].recv()
  
                  assert rx_frame1 == test_frame1
  
                  yield sink_list[0].wait()
                  rx_frame2 = sink_list[0].recv()
  
                  assert rx_frame2 == test_frame2
  
                  yield sink_list[0].wait()
                  rx_frame3 = sink_list[0].recv()
  
                  assert rx_frame3 == test_frame3
  
              assert sink_list[0].empty()
              assert sink_list[1].empty()
              assert sink_list[2].empty()
              assert sink_list[3].empty()
  
              assert status_overflow_latch == 0x0
              assert status_bad_frame_latch == 0x0
              assert status_good_frame_latch == 0xf
  
              yield delay(100)
  
          yield clk.posedge
          print("test 14: many small packets, one to many")
          current_test.next = 14
  
          test_frame0 = axis_ep.AXIStreamFrame(b'\x0E\x00\x00\xFF'+bytearray(range(4)), id=0, dest=0)
          test_frame1 = axis_ep.AXIStreamFrame(b'\x0E\x00\x01\xFF'+bytearray(range(4)), id=0, dest=1)
          test_frame2 = axis_ep.AXIStreamFrame(b'\x0E\x00\x02\xFF'+bytearray(range(4)), id=0, dest=2)
          test_frame3 = axis_ep.AXIStreamFrame(b'\x0E\x00\x03\xFF'+bytearray(range(4)), id=0, dest=3)
  
          for wait in wait_normal, wait_pause_source, wait_pause_sink:
              status_overflow_latch.next = 0
              status_bad_frame_latch.next = 0
              status_good_frame_latch.next = 0
  
              for k in range(64):
                  source_list[0].send(test_frame0)
                  source_list[0].send(test_frame1)
                  source_list[0].send(test_frame2)
                  source_list[0].send(test_frame3)
              yield clk.posedge
              yield clk.posedge
  
              yield wait()
  
              for k in range(64):
                  yield sink_list[0].wait()
                  rx_frame0 = sink_list[0].recv()
  
                  assert rx_frame0 == test_frame0
  
                  yield sink_list[1].wait()
                  rx_frame1 = sink_list[1].recv()
  
                  assert rx_frame1 == test_frame1
  
                  yield sink_list[2].wait()
                  rx_frame2 = sink_list[2].recv()
  
                  assert rx_frame2 == test_frame2
  
                  yield sink_list[3].wait()
                  rx_frame3 = sink_list[3].recv()
  
                  assert rx_frame3 == test_frame3
  
              assert sink_list[0].empty()
              assert sink_list[1].empty()
              assert sink_list[2].empty()
              assert sink_list[3].empty()
  
              assert status_overflow_latch == 0x0
              assert status_bad_frame_latch == 0x0
              assert status_good_frame_latch == 0x1
  
              yield delay(100)
  
          raise StopSimulation
  
      return instances()
  
  def test_bench():
      sim = Simulation(bench())
      sim.run()
  
  if __name__ == '__main__':
      print("Running test...")
      test_bench()
  