98 lines
2.6 KiB
Python
98 lines
2.6 KiB
Python
from nmigen import *
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class OInterface:
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def __init__(self, data_width, address_width=0,
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fine_ts_width=0, enable_replace=True,
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delay=0):
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self.stb = Signal()
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self.busy = Signal()
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assert 0 <= data_width <= 512
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assert 0 <= address_width <= 8
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assert 0 <= fine_ts_width <= 4
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if data_width:
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self.data = Signal(data_width, reset_less=True)
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if address_width:
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self.address = Signal(address_width, reset_less=True)
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if fine_ts_width:
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self.fine_ts = Signal(fine_ts_width, reset_less=True)
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self.enable_replace = enable_replace
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if delay < 0:
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raise ValueError("only positive delays allowed", delay)
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self.delay = delay
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@classmethod
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def like(cls, other):
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return cls(get_data_width(other),
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get_address_width(other),
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get_fine_ts_width(other),
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other.enable_replace,
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other.delay)
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class IInterface:
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def __init__(self, data_width,
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timestamped=True, fine_ts_width=0, delay=0):
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self.stb = Signal()
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assert 0 <= data_width <= 32
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assert 0 <= fine_ts_width <= 4
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if data_width:
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self.data = Signal(data_width, reset_less=True)
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if fine_ts_width:
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self.fine_ts = Signal(fine_ts_width, reset_less=True)
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assert(not fine_ts_width or timestamped)
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self.timestamped = timestamped
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if delay < 0:
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raise ValueError("only positive delays")
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self.delay = delay
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@classmethod
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def like(cls, other):
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return cls(get_data_width(other),
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other.timestamped,
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get_fine_ts_width(other),
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other.delay)
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class Interface:
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def __init__(self, o, i=None):
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self.o = o
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self.i = i
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@classmethod
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def like(cls, other):
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if other.i is None:
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return cls(OInterface.like(other.o))
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else:
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return cls(OInterface.like(other.o),
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IInterface.like(other.i))
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def _get_or_zero(interface, attr):
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if interface is None:
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return 0
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assert isinstance(interface, (OInterface, IInterface))
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if hasattr(interface, attr):
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return len(getattr(interface, attr))
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else:
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return 0
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def get_data_width(interface):
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return _get_or_zero(interface, "data")
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def get_address_width(interface):
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return _get_or_zero(interface, "address")
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def get_fine_ts_width(interface):
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return _get_or_zero(interface, "fine_ts")
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