rocket-chip/rocket/src/main/scala/tile.scala

// See LICENSE for license details.

package rocket

import Chisel._
import uncore._
import Util._

case object CoreName extends Field[String]
case object NDCachePorts extends Field[Int]
case object NTilePorts extends Field[Int]
case object NPTWPorts extends Field[Int]
case object BuildRoCC extends Field[Option[() => RoCC]]

class Tile(resetSignal: Bool = null) extends Module(_reset = resetSignal) {
  val io = new Bundle {
    val tilelink = new TileLinkIO
    val host = new HTIFIO
  }

  val icache = Module(new Frontend, { case CacheName => "L1I"; case CoreName => "Rocket" })
  val dcache = Module(new HellaCache, { case CacheName => "L1D" })
  val ptw = Module(new PTW(params(NPTWPorts)))
  val core = Module(new Core, { case CoreName => "Rocket" })

  val dcArb = Module(new HellaCacheArbiter(params(NDCachePorts)))
  dcArb.io.requestor(0) <> ptw.io.mem
  dcArb.io.requestor(1) <> core.io.dmem
  dcArb.io.mem <> dcache.io.cpu

  ptw.io.requestor(0) <> icache.io.cpu.ptw
  ptw.io.requestor(1) <> dcache.io.cpu.ptw

  core.io.host <> io.host
  core.io.imem <> icache.io.cpu
  core.io.ptw <> ptw.io.dpath

  val memArb = Module(new UncachedTileLinkIOArbiterThatAppendsArbiterId(params(NTilePorts)))
  val dcPortId = 0
  memArb.io.in(dcPortId) <> dcache.io.mem
  memArb.io.in(1) <> icache.io.mem

  //If so specified, build an RoCC module and wire it in
  params(BuildRoCC)
    .map { br => br() }
    .foreach { rocc =>
      val dcIF = Module(new SimpleHellaCacheIF)
      core.io.rocc <> rocc.io
      dcIF.io.requestor <> rocc.io.mem
      dcArb.io.requestor(2) <> dcIF.io.cache
      memArb.io.in(2) <> rocc.io.imem
      ptw.io.requestor(2) <> rocc.io.iptw
      ptw.io.requestor(3) <> rocc.io.dptw
      ptw.io.requestor(4) <> rocc.io.pptw
    }
 
  io.tilelink.acquire <> memArb.io.out.acquire
  io.tilelink.grant <> memArb.io.out.grant
  io.tilelink.finish <> memArb.io.out.finish
  // Probes and releases routed directly to coherent dcache
  io.tilelink.probe <> dcache.io.mem.probe
  // Mimic client id extension done by UncachedTileLinkIOArbiter for Acquires from either client)
  io.tilelink.release.valid   := dcache.io.mem.release.valid
  dcache.io.mem.release.ready := io.tilelink.release.ready
  io.tilelink.release.bits := dcache.io.mem.release.bits
  io.tilelink.release.bits.payload.client_xact_id :=  Cat(dcache.io.mem.release.bits.payload.client_xact_id, UInt(dcPortId, log2Up(params(NTilePorts))))

}