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tilelink: improve entropy of bus delayer

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Henry Cook 2017-08-07 17:36:07 -07:00
parent 2910d6fa2a
commit c4092dd0cc
1 changed files with 14 additions and 6 deletions
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20
src/main/scala/tilelink/Bus.scala
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@ -29,22 +29,30 @@ abstract class TLBusWrapper(params: TLBusParams)(implicit p: Parameters) extends
require(blockBytes % beatBytes == 0) require(blockBytes % beatBytes == 0)
private val delayProb = p(TLBusDelayProbability) private val delayProb = p(TLBusDelayProbability)
private val delayer = if (delayProb > 0.0) Some(LazyModule(new TLDelayer(delayProb))) else None
protected val xbar = LazyModule(new TLXbar) protected val xbar = LazyModule(new TLXbar)
private val master_buffer = LazyModule(new TLBuffer(masterBuffering)) private val master_buffer = LazyModule(new TLBuffer(masterBuffering))
private val slave_buffer = LazyModule(new TLBuffer(slaveBuffering)) private val slave_buffer = LazyModule(new TLBuffer(slaveBuffering))
private val slave_frag = LazyModule(new TLFragmenter(beatBytes, blockBytes)) private val slave_frag = LazyModule(new TLFragmenter(beatBytes, blockBytes))
private val slave_ww = LazyModule(new TLWidthWidget(beatBytes)) 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 xbar.node :=* master_buffer.node
slave_buffer.node :*= delayer.map { d => slave_buffer.node :*= delayedNode
d.node :*= xbar.node
d.node
} .getOrElse { xbar.node }
slave_frag.node :*= slave_buffer.node slave_frag.node :*= slave_buffer.node
slave_ww.node :*= slave_buffer.node slave_ww.node :*= slave_buffer.node
protected def outwardNode: TLOutwardNode = delayer.map(_.node).getOrElse(xbar.node) protected def outwardNode: TLOutwardNode = delayedNode
protected def outwardBufNode: TLOutwardNode = slave_buffer.node protected def outwardBufNode: TLOutwardNode = slave_buffer.node
protected def outwardFragNode: TLOutwardNode = slave_frag.node protected def outwardFragNode: TLOutwardNode = slave_frag.node
protected def outwardWWNode: TLOutwardNode = slave_ww.node protected def outwardWWNode: TLOutwardNode = slave_ww.node