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lib.fifo: handle depth=0, elaborating to a dummy FIFO with no logic.

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This commit is contained in:
whitequark 2019-09-23 12:27:59 +00:00
parent bc53bbf564
commit fd625619f1
2 changed files with 67 additions and 23 deletions
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16
nmigen/test/test_lib_fifo.py
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@ -11,10 +11,21 @@ class FIFOTestCase(FHDLTestCase):
msg="FIFO width must be a non-negative integer, not '-1'"):
FIFOInterface(width=-1, depth=8, fwft=True)
with self.assertRaises(TypeError,
msg="FIFO depth must be a positive integer, not '0'"):
FIFOInterface(width=8, depth=0, fwft=True)
msg="FIFO depth must be a non-negative integer, not '-1'"):
FIFOInterface(width=8, depth=-1, fwft=True)
def test_sync_depth(self):
self.assertEqual(SyncFIFO(width=8, depth=0).depth, 0)
self.assertEqual(SyncFIFO(width=8, depth=1).depth, 1)
self.assertEqual(SyncFIFO(width=8, depth=2).depth, 2)
def test_sync_buffered_depth(self):
self.assertEqual(SyncFIFOBuffered(width=8, depth=0).depth, 0)
self.assertEqual(SyncFIFOBuffered(width=8, depth=1).depth, 1)
self.assertEqual(SyncFIFOBuffered(width=8, depth=2).depth, 2)
def test_async_depth(self):
self.assertEqual(AsyncFIFO(width=8, depth=0 ).depth, 0)
self.assertEqual(AsyncFIFO(width=8, depth=1 ).depth, 1)
self.assertEqual(AsyncFIFO(width=8, depth=2 ).depth, 2)
self.assertEqual(AsyncFIFO(width=8, depth=3 ).depth, 4)
@ -30,6 +41,7 @@ class FIFOTestCase(FHDLTestCase):
AsyncFIFO(width=8, depth=15, exact_depth=True)
def test_async_buffered_depth(self):
self.assertEqual(AsyncFIFOBuffered(width=8, depth=0 ).depth, 0)
self.assertEqual(AsyncFIFOBuffered(width=8, depth=1 ).depth, 2)
self.assertEqual(AsyncFIFOBuffered(width=8, depth=2 ).depth, 2)
self.assertEqual(AsyncFIFOBuffered(width=8, depth=3 ).depth, 3)