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lib.cdc: add diagnostic checks for synchronization stage count.

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This commit is contained in:
whitequark 2019-09-23 19:38:21 +00:00
parent 52e761dc33
commit 22da78ca28
2 changed files with 29 additions and 1 deletions
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16
nmigen/test/test_lib_cdc.py
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@ -5,6 +5,14 @@ from ..lib.cdc import *
class FFSynchronizerTestCase(FHDLTestCase):
def test_stages_wrong(self):
with self.assertRaises(TypeError,
msg="Synchronization stage count must be a positive integer, not '0'"):
FFSynchronizer(Signal(), Signal(), stages=0)
with self.assertRaises(ValueError,
msg="Synchronization stage count may not safely be less than 2"):
FFSynchronizer(Signal(), Signal(), stages=1)
def test_basic(self):
i = Signal()
o = Signal()
@ -43,6 +51,14 @@ class FFSynchronizerTestCase(FHDLTestCase):
class ResetSynchronizerTestCase(FHDLTestCase):
def test_stages_wrong(self):
with self.assertRaises(TypeError,
msg="Synchronization stage count must be a positive integer, not '0'"):
ResetSynchronizer(Signal(), stages=0)
with self.assertRaises(ValueError,
msg="Synchronization stage count may not safely be less than 2"):
ResetSynchronizer(Signal(), stages=1)
def test_basic(self):
arst = Signal()
m = Module()