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tilelink2: support attaching a DecoupledIO directly to a register

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This commit is contained in:
Wesley W. Terpstra 2016-09-02 22:34:51 -07:00
parent 6a378e79e3
commit 81162a2dc9
1 changed files with 8 additions and 17 deletions
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25
src/main/scala/uncore/tilelink2/RegField.scala
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@ -25,16 +25,12 @@ object RegReadFn
val (ovalid, data) = x(oready)
(Bool(true), ovalid, data)
})
// read from a DecoupledIO (only safe if there is a consistent source of data)
implicit def apply(x: DecoupledIO[UInt]):RegReadFn = RegReadFn(ready => { x.ready := ready; (x.valid, x.bits) })
// read from a register
implicit def apply(x: UInt) =
new RegReadFn(true, { case (_, _) =>
(Bool(true), Bool(true), x)
})
implicit def apply(x: UInt):RegReadFn = RegReadFn(ready => (Bool(true), x))
// noop
implicit def apply(x: Unit) =
new RegReadFn(true, { case (_, _) =>
(Bool(true), Bool(true), UInt(0))
})
implicit def apply(x: Unit):RegReadFn = RegReadFn(UInt(0))
}
case class RegWriteFn private(combinational: Boolean, fn: (Bool, Bool, UInt) => (Bool, Bool))
@ -58,17 +54,12 @@ object RegWriteFn
new RegWriteFn(true, { case (_, oready, data) =>
(Bool(true), x(oready, data))
})
// write to a DecoupledIO (only safe if there is a consistent sink draining data)
implicit def apply(x: DecoupledIO[UInt]): RegWriteFn = RegWriteFn((valid, data) => { x.valid := valid; x.bits := data; x.ready })
// updates a register
implicit def apply(x: UInt) =
new RegWriteFn(true, { case (_, oready, data) =>
when (oready) { x := data }
(Bool(true), Bool(true))
})
implicit def apply(x: UInt): RegWriteFn = RegWriteFn((valid, data) => { when (valid) { x := data }; Bool(true) })
// noop
implicit def apply(x: Unit) =
new RegWriteFn(true, { case (_, _, _) =>
(Bool(true), Bool(true))
})
implicit def apply(x: Unit): RegWriteFn = RegWriteFn((valid, data) => { Bool(true) })
}
case class RegField(width: Int, read: RegReadFn, write: RegWriteFn)