object MuxLookup extends SourceInfoDoc
Creates a cascade of n Muxs to search for a key value. The Selector may be a UInt or an EnumType.
- Source
- Mux.scala
MuxLookup(idx, default)(Seq(0.U -> a, 1.U -> b)) MuxLookup(myEnum, default)(Seq(MyEnum.a -> 1.U, MyEnum.b -> 2.U, MyEnum.c -> 3.U))
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- macro def apply[S <: EnumType, T <: Data](key: S, default: T)(mapping: Seq[(S, T)]): T
- key
a key to search for
- default
a default value if nothing is found
- mapping
a sequence to search of keys and values
- returns
the value found or the default if not
- macro def apply[T <: Data](key: UInt, default: T)(mapping: Seq[(UInt, T)]): T
- key
a key to search for
- default
a default value if nothing is found
- mapping
a sequence to search of keys and values
- returns
the value found or the default if not
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- def do_apply[S <: UInt, T <: Data](key: S, default: T, mapping: Seq[(S, T)])(implicit sourceinfo: SourceInfo): T
- def do_applyEnum[S <: EnumType, T <: Data](key: S, default: T, mapping: Seq[(S, T)])(implicit sourceinfo: SourceInfo): T
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Ungrouped
SourceInfoTransformMacro
These internal methods are not part of the public-facing API!
The equivalent public-facing methods do not have the do_ prefix or have the same name. Use and look at the
documentation for those. If you want left shift, use <<, not do_<<. If you want conversion to a
Seq of Bools look at the asBools above, not the one below. Users can safely ignore
every method in this group!
🐉🐉🐉 Here be dragons... 🐉🐉🐉
These do_X methods are used to enable both implicit passing of SourceInfo
while also supporting chained apply methods. In effect all "normal" methods that you, as a user, will use in your
designs, are converted to their "hidden", do_*, via macro transformations. Without using macros here, only one
of the above wanted behaviors is allowed (implicit passing and chained applies)---the compiler interprets a
chained apply as an explicit 'implicit' argument and will throw type errors.
The "normal", public-facing methods then take no SourceInfo. However, a macro transforms this public-facing method
into a call to an internal, hidden do_* that takes an explicit SourceInfo by inserting an
implicitly[SourceInfo] as the explicit argument.