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more declaration of singleton objects
author
Luke Kenneth Casson Leighton
<lkcl@lkcl.net>
Sat, 20 Jun 2020 00:04:02 +0000
(
01:04
+0100)
committer
Luke Kenneth Casson Leighton
<lkcl@lkcl.net>
Sat, 20 Jun 2020 00:04:02 +0000
(
01:04
+0100)
nmigen_soc/wishbone/bus.py
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diff --git
a/nmigen_soc/wishbone/bus.py
b/nmigen_soc/wishbone/bus.py
index 2d9296c1689292cef6d0bdcbc0db693a72a74bbd..580af84f6757f11886c7ee19fd2621cf5c48b16d 100644
(file)
--- a/
nmigen_soc/wishbone/bus.py
+++ b/
nmigen_soc/wishbone/bus.py
@@
-225,8
+225,11
@@
class Decoder(Elaboratable):
Bus providing access to subordinate buses.
"""
Bus providing access to subordinate buses.
"""
- def __init__(self, *, addr_width, data_width, granularity=None, features=frozenset(),
+ def __init__(self, *, addr_width, data_width, granularity=None,
+ features=None,
alignment=0):
alignment=0):
+ if features is None:
+ features = frozenset()
self.bus = Interface(addr_width=addr_width, data_width=data_width,
granularity=granularity, features=features,
alignment=alignment)
self.bus = Interface(addr_width=addr_width, data_width=data_width,
granularity=granularity, features=features,
alignment=alignment)
@@
-373,8
+376,11
@@
class Arbiter(Elaboratable):
Shared bus to which the selected initiator gains access.
"""
Shared bus to which the selected initiator gains access.
"""
- def __init__(self, *, addr_width, data_width, granularity=None, features=frozenset(),
+ def __init__(self, *, addr_width, data_width, granularity=None,
+ features=None,
scheduler="rr"):
scheduler="rr"):
+ if features is None:
+ features = frozenset()
self.bus = Interface(addr_width=addr_width, data_width=data_width,
granularity=granularity, features=features)
self._itors = []
self.bus = Interface(addr_width=addr_width, data_width=data_width,
granularity=granularity, features=features)
self._itors = []