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Merge pull request #932 from freechipsproject/tl-bus-delayer

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tilelink: allow insertion of TLDelayer on TLBus outward node
This commit is contained in:
Henry Cook
2017-08-07 19:01:39 -07:00
committed by GitHub
parent e27072e063 c4092dd0cc
commit c8f8806df0
5 changed files with 26 additions and 5 deletions
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24
src/main/scala/tilelink/Bus.scala
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@ -3,9 +3,10 @@
package freechips.rocketchip.tilelink
import Chisel._
import freechips.rocketchip.config.Parameters
import freechips.rocketchip.config.{Field, Parameters}
import freechips.rocketchip.diplomacy._
import freechips.rocketchip.tilelink._
case object TLBusDelayProbability extends Field[Double]
/** Specifies widths of various attachement points in the SoC */
trait TLBusParams {
@ -26,19 +27,32 @@ abstract class TLBusWrapper(params: TLBusParams)(implicit p: Parameters) extends
val masterBuffering = params.masterBuffering
val slaveBuffering = params.slaveBuffering
require(blockBytes % beatBytes == 0)
private val delayProb = p(TLBusDelayProbability)
private val xbar = LazyModule(new TLXbar)
protected val xbar = LazyModule(new TLXbar)
private val master_buffer = LazyModule(new TLBuffer(masterBuffering))
private val slave_buffer = LazyModule(new TLBuffer(slaveBuffering))
private val slave_frag = LazyModule(new TLFragmenter(beatBytes, blockBytes))
private val slave_ww = LazyModule(new TLWidthWidget(beatBytes))
private val delayedNode = if (delayProb > 0.0) {
val firstDelay = LazyModule(new TLDelayer(delayProb))
val flowDelay = LazyModule(new TLBuffer(BufferParams.flow))
val secondDelay = LazyModule(new TLDelayer(delayProb))
firstDelay.node :*= xbar.node
flowDelay.node :*= firstDelay.node
secondDelay.node :*= flowDelay.node
secondDelay.node
} else {
xbar.node
}
xbar.node :=* master_buffer.node
slave_buffer.node :*= xbar.node
slave_buffer.node :*= delayedNode
slave_frag.node :*= slave_buffer.node
slave_ww.node :*= slave_buffer.node
protected def outwardNode: TLOutwardNode = xbar.node
protected def outwardNode: TLOutwardNode = delayedNode
protected def outwardBufNode: TLOutwardNode = slave_buffer.node
protected def outwardFragNode: TLOutwardNode = slave_frag.node
protected def outwardWWNode: TLOutwardNode = slave_ww.node