riscv/rocket-chip
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diplomacy: remove node arity and allow empty Nexus nodes (Xbars)

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This removes the mostly obsolete 'numIn/Out' range restrictions on nodes.
It also makes it possible to connect optional crossbars that disappear.

val x = TLXbar()
x := master
slave := x

val y = TLXbar()
x :=* y // only connect y if it gets used

This will create crossbar x, but crossbar y will disappear.
This commit is contained in:
Wesley W. Terpstra
2017-11-30 14:43:43 -08:00
parent 6a25a3b7ac
commit e489c4226e
16 changed files with 155 additions and 182 deletions
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2
src/main/scala/tilelink/NodeNumberer.scala
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@ -6,7 +6,7 @@ import Chisel._
import freechips.rocketchip.config.Parameters
import freechips.rocketchip.diplomacy._
case class TLNodeNumbererNode(nodeAddressOffset: Option[Int] = None)(implicit valName: ValName) extends TLCustomNode(0 to 999, 0 to 999)
case class TLNodeNumbererNode(nodeAddressOffset: Option[Int] = None)(implicit valName: ValName) extends TLCustomNode
{
def resolveStar(iKnown: Int, oKnown: Int, iStars: Int, oStars: Int): (Int, Int) = {
require (oStars + iStars <= 1, s"${name} (a custom adapter) appears left of a :*= ${iStars} times and right of a :=* ${oStars} times; at most once is allowed${lazyModule.line}")