Add GMII endpoint module

tb/gmii_ep.py

@@ -0,0 +1,100 @@
+"""
+
+Copyright (c) 2014 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 *
+
+def GMIISource(clk, rst,
+               txd,
+               tx_en,
+               tx_er,
+               fifo=None,
+               name=None):
+
+    @instance
+    def logic():
+        frame = []
+        ifg_cnt = 0
+
+        while True:
+            yield clk.posedge, rst.posedge
+
+            if rst:
+                frame = []
+                txd.next = 0
+                tx_en.next = 0
+                tx_er.next = 0
+                ifg_cnt = 0
+            else:
+                if ifg_cnt > 0:
+                    ifg_cnt -= 1
+                    tx_en.next = 0
+                elif len(frame) > 0:
+                    txd.next = frame.pop(0)
+                    tx_en.next = 1
+                    if len(frame) == 0:
+                        ifg_cnt = 12
+                elif not fifo.empty():
+                    frame = fifo.get()
+                    if name is not None:
+                        print("[%s] Sending frame %s" % (name, repr(frame)))
+                    frame = '\x55\x55\x55\x55\x55\x55\x55\xD5'+bytearray(frame)
+                    txd.next = frame.pop(0)
+                    tx_en.next = 1
+                else:
+                    tx_en.next = 0
+
+    return logic
+
+
+def GMIISink(clk, rst,
+             rxd,
+             rx_dv,
+             rx_er,
+             fifo=None,
+             name=None):
+
+    @instance
+    def logic():
+        frame = None
+
+        while True:
+            yield clk.posedge, rst.posedge
+
+            if rst:
+                frame = None
+            else:
+                if rx_dv:
+                    if frame is None and rxd == 0xD5:
+                        frame = []
+                    elif frame is not None:
+                        frame.append(int(rxd))
+                elif frame is not None:
+                    if len(frame) > 0:
+                        if fifo is not None:
+                            fifo.put(frame)
+                        if name is not None:
+                            print("[%s] Got frame %s" % (name, repr(frame)))
+                    frame = None
+
+    return logic