liteeth/core/etherbone/__init__.py

   1 from liteeth.common import *
   2 from liteeth.core.etherbone import common
   3 from liteeth.core.etherbone.packet import *
   4
   5 class LiteEthEtherbone(Module):
   6         def __init__(self, udp, udp_port):
   7                 self.submodules.packet = packet = LiteEthEtherbonePacket(udp, udp_port)
   8
   9                 self.submodules.fsm = fsm = FSM(reset_state="IDLE")
  10                 fsm.act("IDLE",
  11                         packet.source.ack.eq(1),
  12                         If(packet.source.stb & packet.source.sop,
  13                                 If(packet.source.pf,
  14                                         packet.source.ack.eq(0),
  15                                         NextState("SEND_PROBE_RESPONSE")
  16                                 )
  17                         )
  18                 )
  19                 fsm.act("SEND_PROBE_RESPONSE",
  20                         packet.sink.stb.eq(1),
  21                         packet.sink.sop.eq(1),
  22                         packet.sink.eop.eq(1),
  23                         packet.sink.pr.eq(1),
  24                         packet.sink.ip_address.eq(packet.source.ip_address),
  25                         packet.sink.length.eq(0),
  26                         If(packet.sink.ack,
  27                                 packet.source.ack.eq(1),
  28                                 NextState("IDLE")
  29                         )
  30                 )