41 lines
1.2 KiB
Python
41 lines
1.2 KiB
Python
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# This file is Copyright (c) 2019 Florent Kermarrec <florent@enjoy-digital.fr>
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# License: BSD
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import unittest
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import random
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from migen import *
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from litedram.common import tXXDController
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class TestTimingControllers(unittest.TestCase):
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def txxd_controller_test(self, txxd, loops):
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def generator(dut, valid_rand):
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prng = random.Random(42)
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for l in range(loops):
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while prng.randrange(100) < valid_rand:
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yield
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yield dut.valid.eq(1)
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yield
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yield dut.valid.eq(0)
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@passive
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def checker(dut):
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dut.ready_gaps = []
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while True:
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while (yield dut.ready) != 0:
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yield
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ready_gap = 1
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while (yield dut.ready) != 1:
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ready_gap += 1
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yield
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dut.ready_gaps.append(ready_gap)
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dut = tXXDController(txxd)
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run_simulation(dut, [generator(dut, valid_rand=90), checker(dut)])
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self.assertEqual(min(dut.ready_gaps), txxd)
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def test_txxd_controller(self):
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for i in range(2, 32):
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self.txxd_controller_test(i, 512)
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