97 lines
3.3 KiB
Python
97 lines
3.3 KiB
Python
__all__ = ["Pins", "Subsignal", "DiffPairs", "Resource"]
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class Pins:
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def __init__(self, names, dir="io"):
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if not isinstance(names, str):
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raise TypeError("Names must be a whitespace-separated string, not {!r}"
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.format(names))
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self.names = names.split()
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if dir not in ("i", "o", "io"):
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raise TypeError("Direction must be one of \"i\", \"o\" or \"io\", not {!r}"
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.format(dir))
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self.dir = dir
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def __len__(self):
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return len(self.names)
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def __iter__(self):
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return iter(self.names)
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def __repr__(self):
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return "(pins {} {})".format(self.dir, " ".join(self.names))
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class DiffPairs:
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def __init__(self, p, n, dir="io"):
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self.p = Pins(p, dir=dir)
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self.n = Pins(n, dir=dir)
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if len(self.p.names) != len(self.n.names):
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raise TypeError("Positive and negative pins must have the same width, but {!r} "
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"and {!r} do not"
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.format(self.p, self.n))
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self.dir = dir
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def __len__(self):
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return len(self.p.names)
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def __iter__(self):
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return zip(self.p.names, self.n.names)
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def __repr__(self):
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return "(diffpairs {} (p {}) (n {}))".format(
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self.dir, " ".join(self.p.names), " ".join(self.n.names))
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class Subsignal:
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def __init__(self, name, *io, extras=()):
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self.name = name
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if not io:
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raise TypeError("Missing I/O constraints")
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for c in io:
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if not isinstance(c, (Pins, DiffPairs, Subsignal)):
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raise TypeError("I/O constraint must be one of Pins, DiffPairs or Subsignal, "
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"not {!r}"
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.format(c))
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if isinstance(io[0], (Pins, DiffPairs)) and len(io) > 1:
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raise TypeError("Pins and DiffPairs cannot be followed by more I/O constraints, but "
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"{!r} is followed by {!r}"
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.format(io[0], io[1]))
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if isinstance(io[0], Subsignal):
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for c in io[1:]:
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if not isinstance(c, Subsignal):
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raise TypeError("A Subsignal can only be followed by more Subsignals, but "
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"{!r} is followed by {!r}"
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.format(io[0], c))
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self.io = io
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for c in extras:
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if not isinstance(c, str):
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raise TypeError("Extra constraint must be a string, not {!r}".format(c))
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self.extras = list(extras)
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if isinstance(self.io[0], Subsignal):
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for sub in self.io:
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sub.extras += self.extras
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def __repr__(self):
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return "(subsignal {} {} {})".format(self.name,
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" ".join(map(repr, self.io)),
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" ".join(self.extras))
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class Resource(Subsignal):
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def __init__(self, name, number, *io, extras=()):
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super().__init__(name, *io, extras=extras)
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self.number = number
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def __repr__(self):
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return "(resource {} {} {} {})".format(self.name, self.number,
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" ".join(map(repr, self.io)),
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" ".join(self.extras))
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