diff --git a/src/main/scala/coreplex/BaseCoreplex.scala b/src/main/scala/coreplex/BaseCoreplex.scala
index 4d2f0b59..d3062d83 100644
--- a/src/main/scala/coreplex/BaseCoreplex.scala
+++ b/src/main/scala/coreplex/BaseCoreplex.scala
@@ -46,10 +46,14 @@ case object BootROMFile extends Field[String]
 trait HasCoreplexParameters {
   implicit val p: Parameters
   lazy val tilesParams = p(RocketTilesKey)
-  lazy val cbusConfig = p(CBusConfig)
-  lazy val l1tol2Config = p(L1toL2Config)
+  lazy val sbusConfig = p(L1toL2Config)
+  lazy val pbusConfig = p(CBusConfig)
   lazy val nTiles = tilesParams.size
   lazy val l2Config = p(BankedL2Config)
+  def sbusBeatBytes = sbusConfig.beatBytes
+  def sbusBlockBytes = p(CacheBlockBytes)
+  def pbusBeatBytes = pbusConfig.beatBytes
+  def pbusBlockBytes = sbusBlockBytes
 }
 
 case class CoreplexParameters(implicit val p: Parameters) extends HasCoreplexParameters
diff --git a/src/main/scala/coreplex/Configs.scala b/src/main/scala/coreplex/Configs.scala
index 3a3bb958..35dce9e3 100644
--- a/src/main/scala/coreplex/Configs.scala
+++ b/src/main/scala/coreplex/Configs.scala
@@ -21,11 +21,12 @@ class BaseCoreplexConfig extends Config ((site, here, up) => {
   case XLen => 64 // Applies to all cores
   case ResetVectorBits => site(PAddrBits)
   case MaxHartIdBits => log2Up(site(NTiles))
-  case MaxPriorityLevels => 7
   case BuildCore => (p: Parameters) => new Rocket()(p)
   case RocketCrossing => SynchronousCrossing()
   case RocketTilesKey =>  Nil
   case DMKey => DefaultDebugModuleConfig(site(XLen))
+  case PLICKey => PLICParams()
+  case ClintKey => ClintParams()
   case NTiles => site(RocketTilesKey).size
   case CBusConfig => TLBusConfig(beatBytes = site(XLen)/8)
   case L1toL2Config => TLBusConfig(beatBytes = site(XLen)/8) // increase for more PCIe bandwidth
diff --git a/src/main/scala/coreplex/CoreplexNetwork.scala b/src/main/scala/coreplex/CoreplexNetwork.scala
index 7d64ec8c..70eb30e4 100644
--- a/src/main/scala/coreplex/CoreplexNetwork.scala
+++ b/src/main/scala/coreplex/CoreplexNetwork.scala
@@ -13,46 +13,40 @@ trait CoreplexNetwork extends HasCoreplexParameters {
   val module: CoreplexNetworkModule
   def bindingTree: ResourceMap
 
-  val tile_splitter = LazyModule(new TLSplitter)
+  // TODO: do we need one of these? val cbus = LazyModule(new TLXbar) // Locally-visible peripheral devices
+  val sbus = LazyModule(new TLXbar) // Globally-visible high-bandwidth devices
+  val pbus = LazyModule(new TLXbar) // Globally-visible low-bandwidth devices
+  val tile_splitter = LazyModule(new TLSplitter) // Allows cycle-free connection to external networks
+  val int_xbar = LazyModule(new IntXbar) // Interrupt crossbar
 
-  val l1tol2 = LazyModule(new TLXbar)
-  val l1tol2_beatBytes = l1tol2Config.beatBytes
-  val l1tol2_lineBytes = p(CacheBlockBytes)
+  val mmio = TLOutputNode() // Exernal memory-mapped IO slaves
+  val mmioInt = IntInputNode() // Exernal devices' interrupts
+  val l2in = TLInputNode() // External masters talking to the frontside of the shared cache
+  val l2out = TLOutputNode() // External slaves hanging off the backside of the shared cache
 
-  val cbus = LazyModule(new TLXbar)
-  val cbus_beatBytes = cbusConfig.beatBytes
-  val cbus_lineBytes = l1tol2_lineBytes
-
-  val intBar = LazyModule(new IntXbar)
-
-  val mmio = TLOutputNode()
-  val mmioInt = IntInputNode()
-  val l2in = TLInputNode()
-  val l2out = TLOutputNode()
-
-  intBar.intnode := mmioInt
+  int_xbar.intnode := mmioInt
 
   // Allows a variable number of inputs from outside to the Xbar
   private val l2in_buffer = LazyModule(new TLBuffer)
   private val l2in_fifo = LazyModule(new TLFIFOFixer)
-  l1tol2.node :=* l2in_fifo.node
-  l1tol2.node :=* tile_splitter.node
+  sbus.node :=* l2in_fifo.node
+  sbus.node :=* tile_splitter.node
   l2in_fifo.node :=* l2in_buffer.node
   l2in_buffer.node :=* l2in
 
   private val l2out_buffer = LazyModule(new TLBuffer(BufferParams.flow, BufferParams.none))
   l2out :*= l2out_buffer.node
-  l2out_buffer.node :*= l1tol2.node
+  l2out_buffer.node :*= sbus.node
 
-  cbus.node :=
+  pbus.node :=
     TLBuffer()(
     TLAtomicAutomata(arithmetic = true)( // disable once TLB uses TL2 metadata
-    TLWidthWidget(l1tol2_beatBytes)(
-    l1tol2.node)))
+    TLWidthWidget(sbusBeatBytes)(
+    sbus.node)))
 
   mmio :=
-    TLWidthWidget(l1tol2_beatBytes)(
-    l1tol2.node)
+    TLWidthWidget(sbusBeatBytes)(
+    sbus.node)
 
   val root = new Device {
     def describe(resources: ResourceBindings): Description = {
@@ -168,16 +162,16 @@ trait BankedL2CoherenceManagers extends CoreplexNetwork {
 
   require (isPow2(l2Config.nMemoryChannels) || l2Config.nMemoryChannels == 0)
   require (isPow2(l2Config.nBanksPerChannel))
-  require (isPow2(l1tol2_lineBytes))
+  require (isPow2(sbusBlockBytes))
 
   private val (in, out) = l2Config.coherenceManager(p, this)
-  private val mask = ~BigInt((l2Config.nBanks-1) * l1tol2_lineBytes)
+  private val mask = ~BigInt((l2Config.nBanks-1) * sbusBlockBytes)
   val mem = Seq.tabulate(l2Config.nMemoryChannels) { channel =>
     val node = TLOutputNode()
     for (bank <- 0 until l2Config.nBanksPerChannel) {
       val offset = (bank * l2Config.nMemoryChannels) + channel
-      in := l1tol2.node
-      node := TLFilter(AddressSet(offset * l1tol2_lineBytes, mask))(out)
+      in := sbus.node
+      node := TLFilter(AddressSet(offset * sbusBlockBytes, mask))(out)
     }
     node
   }
diff --git a/src/main/scala/coreplex/ISPPort.scala b/src/main/scala/coreplex/ISPPort.scala
index 4296cd20..eb60873f 100644
--- a/src/main/scala/coreplex/ISPPort.scala
+++ b/src/main/scala/coreplex/ISPPort.scala
@@ -27,7 +27,7 @@ trait HasISPPort extends CoreplexNetwork {
 
   private val in_async = LazyModule(new TLAsyncCrossingSink)
   in_async.node :=* isp_in
-  l1tol2.node :=* in_async.node
+  sbus.node :=* in_async.node
 }
 
 trait HasISPPortBundle extends CoreplexNetworkBundle {
diff --git a/src/main/scala/coreplex/RISCVPlatform.scala b/src/main/scala/coreplex/RISCVPlatform.scala
index ec65c192..e52af304 100644
--- a/src/main/scala/coreplex/RISCVPlatform.scala
+++ b/src/main/scala/coreplex/RISCVPlatform.scala
@@ -10,20 +10,23 @@ import uncore.tilelink2._
 import uncore.devices._
 import util._
 
-case object MaxPriorityLevels extends Field[Int]
+/** Number of tiles */
+case object NTiles extends Field[Int]
+case object PLICKey extends Field[PLICParams]
+case object ClintKey extends Field[ClintParams]
 
 trait CoreplexRISCVPlatform extends CoreplexNetwork {
   val module: CoreplexRISCVPlatformModule
 
   val debug = LazyModule(new TLDebugModule())
-  val plic  = LazyModule(new TLPLIC(maxPriorities = p(MaxPriorityLevels)))
-  val clint = LazyModule(new CoreplexLocalInterrupter)
+  debug.node := TLFragmenter(pbusBeatBytes, pbusBlockBytes)(pbus.node)
 
-  debug.node := TLFragmenter(cbus_beatBytes, cbus_lineBytes)(cbus.node)
-  plic.node  := TLFragmenter(cbus_beatBytes, cbus_lineBytes)(cbus.node)
-  clint.node := TLFragmenter(cbus_beatBytes, cbus_lineBytes)(cbus.node)
+  val plic  = LazyModule(new TLPLIC(p(PLICKey)))
+  plic.node  := TLFragmenter(pbusBeatBytes, pbusBlockBytes)(pbus.node)
+  plic.intnode := int_xbar.intnode
 
-  plic.intnode := intBar.intnode
+  val clint = LazyModule(new CoreplexLocalInterrupter(nTiles, p(ClintKey)))
+  clint.node := TLFragmenter(pbusBeatBytes, pbusBlockBytes)(pbus.node)
 
   lazy val dts = DTS(bindingTree)
   lazy val dtb = DTB(dts)
diff --git a/src/main/scala/coreplex/RocketTiles.scala b/src/main/scala/coreplex/RocketTiles.scala
index 2e8e9562..4b619017 100644
--- a/src/main/scala/coreplex/RocketTiles.scala
+++ b/src/main/scala/coreplex/RocketTiles.scala
@@ -65,7 +65,7 @@ trait HasRocketTiles extends CoreplexRISCVPlatform {
         buffer.node :=* wrapper.masterNode
         fixer.node :=* buffer.node
         tile_splitter.node :=* fixer.node
-        wrapper.slaveNode :*= cbus.node
+        wrapper.slaveNode :*= pbus.node
         wrapper.asyncIntNode  := asyncIntXbar.intnode
         wrapper.periphIntNode := periphIntXbar.intnode
         wrapper.coreIntNode   := coreIntXbar.intnode
@@ -87,7 +87,7 @@ trait HasRocketTiles extends CoreplexRISCVPlatform {
         wrapper.asyncIntNode  := asyncIntXbar.intnode
         wrapper.periphIntNode := periphIntXbar.intnode
         wrapper.coreIntNode   := coreIntXbar.intnode
-        source.node :*= cbus.node
+        source.node :*= pbus.node
         (io: HasRocketTilesBundle) => {
           wrapper.module.clock := io.tcrs(i).clock
           wrapper.module.reset := io.tcrs(i).reset
@@ -107,7 +107,7 @@ trait HasRocketTiles extends CoreplexRISCVPlatform {
         wrapper.asyncIntNode := asyncIntXbar.intnode
         wrapper.periphIntNode := periphIntXbar.intnode
         wrapper.coreIntNode   := coreIntXbar.intnode
-        source.node :*= cbus.node
+        source.node :*= pbus.node
         (io: HasRocketTilesBundle) => {
           wrapper.module.clock := io.tcrs(i).clock
           wrapper.module.reset := io.tcrs(i).reset
diff --git a/src/main/scala/groundtest/Configs.scala b/src/main/scala/groundtest/Configs.scala
index 63ba2737..05ad31e1 100644
--- a/src/main/scala/groundtest/Configs.scala
+++ b/src/main/scala/groundtest/Configs.scala
@@ -10,7 +10,6 @@ import uncore.tilelink._
 import uncore.coherence._
 import uncore.agents._
 import uncore.util._
-import uncore.devices.NTiles
 import tile.TileKey
 import junctions._
 import config._
diff --git a/src/main/scala/groundtest/Coreplex.scala b/src/main/scala/groundtest/Coreplex.scala
index e4b133d0..aa2ec4e9 100644
--- a/src/main/scala/groundtest/Coreplex.scala
+++ b/src/main/scala/groundtest/Coreplex.scala
@@ -44,8 +44,8 @@ class GroundTestCoreplex(implicit p: Parameters) extends BaseCoreplex {
   tile_splitter.node :=* fixer.node
   tiles.foreach { fixer.node :=* _.masterNode }
 
-  val cbusRAM = LazyModule(new TLRAM(AddressSet(testRamAddr, 0xffff), false, cbus_beatBytes))
-  cbusRAM.node := TLFragmenter(cbus_beatBytes, cbus_lineBytes)(cbus.node)
+  val pbusRAM = LazyModule(new TLRAM(AddressSet(testRamAddr, 0xffff), false, pbusBlockBytes))
+  pbusRAM.node := TLFragmenter(pbusBeatBytes, pbusBlockBytes)(pbus.node)
 
   override lazy val module = new GroundTestCoreplexModule(this, () => new GroundTestCoreplexBundle(this))
 }
diff --git a/src/main/scala/groundtest/TraceGen.scala b/src/main/scala/groundtest/TraceGen.scala
index 37880862..d2e233bc 100644
--- a/src/main/scala/groundtest/TraceGen.scala
+++ b/src/main/scala/groundtest/TraceGen.scala
@@ -22,7 +22,7 @@ package groundtest
 import Chisel._
 import uncore.tilelink._
 import uncore.constants._
-import uncore.devices.NTiles
+import coreplex.NTiles
 import rocket._
 import tile._
 import util.{Timer, DynamicTimer}
diff --git a/src/main/scala/groundtest/TrafficGenerator.scala b/src/main/scala/groundtest/TrafficGenerator.scala
index 2d1c77f1..0eefcd29 100644
--- a/src/main/scala/groundtest/TrafficGenerator.scala
+++ b/src/main/scala/groundtest/TrafficGenerator.scala
@@ -5,7 +5,7 @@ package groundtest
 
 import Chisel._
 import uncore.tilelink._
-import uncore.devices.NTiles
+import coreplex.NTiles
 import uncore.constants._
 import junctions._
 import rocket._
diff --git a/src/main/scala/uncore/devices/Clint.scala b/src/main/scala/uncore/devices/Clint.scala
index 673106d8..5a7d3c4e 100644
--- a/src/main/scala/uncore/devices/Clint.scala
+++ b/src/main/scala/uncore/devices/Clint.scala
@@ -14,9 +14,6 @@ import scala.math.{min,max}
 import config._
 import tile.XLen
 
-/** Number of tiles */
-case object NTiles extends Field[Int]
-
 object ClintConsts
 {
   def msipOffset(hart: Int) = hart * msipBytes
@@ -30,7 +27,12 @@ object ClintConsts
   def ints = 2
 }
 
-class CoreplexLocalInterrupter(address: BigInt = 0x02000000)(implicit p: Parameters) extends LazyModule
+case class ClintParams(baseAddress: BigInt = 0x02000000)
+{
+  def address = AddressSet(baseAddress, ClintConsts.size-1)
+}
+
+class CoreplexLocalInterrupter(nTiles: Int, params: ClintParams)(implicit p: Parameters) extends LazyModule
 {
   import ClintConsts._
 
@@ -40,7 +42,7 @@ class CoreplexLocalInterrupter(address: BigInt = 0x02000000)(implicit p: Paramet
   }
 
   val node = TLRegisterNode(
-    address   = Seq(AddressSet(address, size-1)),
+    address   = Seq(params.address),
     device    = device,
     beatBytes = p(XLen)/8)
 
@@ -64,8 +66,8 @@ class CoreplexLocalInterrupter(address: BigInt = 0x02000000)(implicit p: Paramet
         reg := newTime >> i
     }
 
-    val timecmp = Seq.fill(p(NTiles)) { Seq.fill(timeWidth/regWidth)(Reg(UInt(width = regWidth))) }
-    val ipi = Seq.fill(p(NTiles)) { RegInit(UInt(0, width = 1)) }
+    val timecmp = Seq.fill(nTiles) { Seq.fill(timeWidth/regWidth)(Reg(UInt(width = regWidth))) }
+    val ipi = Seq.fill(nTiles) { RegInit(UInt(0, width = 1)) }
 
     io.int.zipWithIndex.foreach { case (int, i) =>
       int(0) := ipi(i)(0) // msip
diff --git a/src/main/scala/uncore/devices/Plic.scala b/src/main/scala/uncore/devices/Plic.scala
index 0c0e26aa..a71b7d5c 100644
--- a/src/main/scala/uncore/devices/Plic.scala
+++ b/src/main/scala/uncore/devices/Plic.scala
@@ -53,11 +53,15 @@ object PLICConsts
   require(hartBase >= enableBase(maxHarts))
 }
 
-/** Platform-Level Interrupt Controller */
-class TLPLIC(maxPriorities: Int, address: BigInt = 0xC000000)(implicit p: Parameters) extends LazyModule
+case class PLICParams(baseAddress: BigInt = 0xC000000, maxPriorities: Int = 7)
 {
   require (maxPriorities >= 0)
+  def address = AddressSet(baseAddress, PLICConsts.size-1)
+}
 
+/** Platform-Level Interrupt Controller */
+class TLPLIC(params: PLICParams)(implicit p: Parameters) extends LazyModule
+{
   // plic0 => max devices 1023
   val device = new SimpleDevice("interrupt-controller", Seq("riscv,plic0")) {
     override val alwaysExtended = true
@@ -73,7 +77,7 @@ class TLPLIC(maxPriorities: Int, address: BigInt = 0xC000000)(implicit p: Parame
   }
 
   val node = TLRegisterNode(
-    address   = Seq(AddressSet(address, PLICConsts.size-1)),
+    address   = Seq(params.address),
     device    = device,
     beatBytes = p(XLen)/8,
     undefZero = false,
@@ -87,7 +91,7 @@ class TLPLIC(maxPriorities: Int, address: BigInt = 0xC000000)(implicit p: Parame
 
   /* Negotiated sizes */
   def nDevices: Int = intnode.edgesIn.map(_.source.num).sum
-  def nPriorities = min(maxPriorities, nDevices)
+  def nPriorities = min(params.maxPriorities, nDevices)
   def nHarts = intnode.edgesOut.map(_.source.num).sum
 
   // Assign all the devices unique ranges