from migen.fhdl.std import * from migen.genlib.fsm import * from migen.actorlib.fifo import * from migen.flow.actor import EndpointDescription from migen.actorlib.packet import * packet_header_length = 9 packet_header_fields = { "preamble": HeaderField(0, 0, 32), "dst": HeaderField(4, 0, 8), "length": HeaderField(5, 0, 32) } packet_header = Header(packet_header_fields, packet_header_length, swap_field_bytes=True) def phy_description(dw): payload_layout = [("data", dw)] return EndpointDescription(payload_layout, packetized=False) def packet_description(dw): param_layout = packet_header.get_layout() payload_layout = [ ("data", dw), ("error", dw//8) ] return EndpointDescription(payload_layout, param_layout, packetized=True) def user_description(dw): param_layout = [ ("dst", 8), ("length", 32) ] payload_layout = [ ("data", dw), ("error", dw//8) ] return EndpointDescription(payload_layout, param_layout, packetized=True) class LiteUSBMasterPort: def __init__(self, dw): self.source = Source(user_description(dw)) self.sink = Sink(user_description(dw)) class LiteUSBSlavePort: def __init__(self, dw): self.sink = Sink(user_description(dw)) self.source = Source(user_description(dw)) class LiteUSBUserPort(LiteUSBSlavePort): def __init__(self, dw): LiteUSBSlavePort.__init__(self, dw)