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lib.cdc: update PulseSynchronizer to follow conventions.

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Fixes #370.
This commit is contained in:
whitequark 2020-06-28 05:17:33 +00:00
parent 2606ee33ad
commit 25ce260207
2 changed files with 27 additions and 26 deletions
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13
nmigen/test/test_lib_cdc.py
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@ -195,12 +195,13 @@ class ResetSynchronizerTestCase(FHDLTestCase):
# TODO: test with distinct clocks
class PulseSynchronizerTestCase(FHDLTestCase):
def test_paramcheck(self):
with self.assertRaises(TypeError):
ps = PulseSynchronizer("w", "r", sync_stages=0)
with self.assertRaises(TypeError):
ps = PulseSynchronizer("w", "r", sync_stages="abc")
ps = PulseSynchronizer("w", "r", sync_stages = 1)
def test_stages_wrong(self):
with self.assertRaises(TypeError,
msg="Synchronization stage count must be a positive integer, not 0"):
PulseSynchronizer("w", "r", stages=0)
with self.assertRaises(ValueError,
msg="Synchronization stage count may not safely be less than 2"):
PulseSynchronizer("w", "r", stages=1)
def test_smoke(self):
m = Module()