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100 lines
3.0 KiB
Python
100 lines
3.0 KiB
Python
"""
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Copyright (c) 2014 Alex Forencich
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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"""
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from myhdl import *
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def GMIISource(clk, rst,
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txd,
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tx_en,
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tx_er,
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fifo=None,
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name=None):
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@instance
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def logic():
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frame = []
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ifg_cnt = 0
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while True:
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yield clk.posedge, rst.posedge
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if rst:
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frame = []
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txd.next = 0
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tx_en.next = 0
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tx_er.next = 0
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ifg_cnt = 0
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else:
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if ifg_cnt > 0:
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ifg_cnt -= 1
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tx_en.next = 0
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elif len(frame) > 0:
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txd.next = frame.pop(0)
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tx_en.next = 1
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if len(frame) == 0:
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ifg_cnt = 12
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elif not fifo.empty():
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frame = list(fifo.get())
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if name is not None:
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print("[%s] Sending frame %s" % (name, repr(frame)))
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txd.next = frame.pop(0)
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tx_en.next = 1
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else:
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tx_en.next = 0
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return logic
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def GMIISink(clk, rst,
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rxd,
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rx_dv,
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rx_er,
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fifo=None,
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name=None):
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@instance
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def logic():
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frame = None
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while True:
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yield clk.posedge, rst.posedge
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if rst:
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frame = None
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else:
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if rx_dv:
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if frame is None:
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frame = []
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frame.append(int(rxd))
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elif frame is not None:
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if len(frame) > 0:
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frame = bytearray(frame)
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if fifo is not None:
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fifo.put(frame)
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if name is not None:
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print("[%s] Got frame %s" % (name, repr(frame)))
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frame = None
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return logic
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