hdl.ast: add an explicit Shape class, included in prelude.
Shapes have long been a part of nMigen, but represented using tuples.
This commit adds a Shape class (using namedtuple for backwards
compatibility), and accepts anything castable to Shape (including
enums, ranges, etc) anywhere a tuple was accepted previously.
In addition, `signed(n)` and `unsigned(n)` are added as aliases for
`Shape(n, signed=True)` and `Shape(n, signed=False)`, transforming
code such as `Signal((8, True))` to `Signal(signed(8))`.
These aliases are also included in prelude.
Preparation for #225.
2019-10-11 06:52:41 -06:00
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from .ast import Shape, unsigned, signed
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2019-06-04 02:18:50 -06:00
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from .ast import Value, Const, C, Mux, Cat, Repl, Array, Signal, ClockSignal, ResetSignal
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from .dsl import Module
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from .cd import ClockDomain
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from .ir import Elaboratable, Fragment, Instance
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from .mem import Memory
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from .rec import Record
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2019-08-12 07:37:18 -06:00
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from .xfrm import DomainRenamer, ResetInserter, EnableInserter, \
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CEInserter # deprecated
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