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tilelink2 Crossing: cut the crossing between clock domains

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This commit is contained in:
Wesley W. Terpstra
2016-09-29 17:32:18 -07:00
parent 20f42a8762
commit 6d8c965f04
2 changed files with 87 additions and 19 deletions
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102
src/main/scala/uncore/tilelink2/Crossing.scala
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@@ -6,33 +6,63 @@ import Chisel._
import chisel3.internal.sourceinfo.SourceInfo
import util._
class TLAsyncCrossing(depth: Int = 8, sync: Int = 3) extends LazyModule
class TLAsyncCrossingSource(sync: Int = 3) extends LazyModule
{
val node = TLIdentityNode()
val node = TLAsyncSourceNode()
lazy val module = new LazyModuleImp(this) {
val io = new Bundle {
val in = node.bundleIn
val in_clock = Clock(INPUT)
val in_reset = Bool(INPUT)
val out = node.bundleOut
val out_clock = Clock(INPUT)
val out_reset = Bool(INPUT)
val in = node.bundleIn
val out = node.bundleOut
}
// Transfer all TL2 bundles from/to the same domains
((io.in zip io.out) zip (node.edgesIn zip node.edgesOut)) foreach { case ((in, out), (edgeIn, edgeOut)) =>
out.a <> AsyncIrrevocableCrossing(io.in_clock, io.in_reset, in.a, io.out_clock, io.out_reset, depth, sync)
in.d <> AsyncIrrevocableCrossing(io.out_clock, io.out_reset, out.d, io.in_clock, io.in_reset, depth, sync)
val bce = edgeIn.manager.anySupportAcquire && edgeIn.client.anySupportProbe
val depth = edgeOut.manager.depth
if (edgeOut.manager.anySupportAcquire && edgeOut.client.anySupportProbe) {
in.b <> AsyncIrrevocableCrossing(io.out_clock, io.out_reset, out.b, io.in_clock, io.in_reset, depth, sync)
out.c <> AsyncIrrevocableCrossing(io.in_clock, io.in_reset, in.c, io.out_clock, io.out_reset, depth, sync)
out.e <> AsyncIrrevocableCrossing(io.in_clock, io.in_reset, in.e, io.out_clock, io.out_reset, depth, sync)
out.a := ToAsyncBundle(in.a, depth, sync)
in.d := FromAsyncBundle(out.d, sync)
if (bce) {
in.b := FromAsyncBundle(out.b, sync)
out.c := ToAsyncBundle(in.c, depth, sync)
out.e := ToAsyncBundle(in.e, depth, sync)
} else {
in.b.valid := Bool(false)
in.c.ready := Bool(true)
in.e.ready := Bool(true)
out.b.ridx := UInt(0)
out.c.widx := UInt(0)
out.e.widx := UInt(0)
}
}
}
}
class TLAsyncCrossingSink(depth: Int = 8, sync: Int = 3) extends LazyModule
{
val node = TLAsyncSinkNode(depth)
lazy val module = new LazyModuleImp(this) {
val io = new Bundle {
val in = node.bundleIn
val out = node.bundleOut
}
((io.in zip io.out) zip (node.edgesIn zip node.edgesOut)) foreach { case ((in, out), (edgeIn, edgeOut)) =>
val bce = edgeOut.manager.anySupportAcquire && edgeOut.client.anySupportProbe
out.a := FromAsyncBundle(in.a, sync)
in.d := ToAsyncBundle(out.d, depth, sync)
if (bce) {
in.b := ToAsyncBundle(out.b, depth, sync)
out.c := FromAsyncBundle(in.c, sync)
out.e := FromAsyncBundle(in.e, sync)
} else {
in.b.widx := UInt(0)
in.c.ridx := UInt(0)
in.e.ridx := UInt(0)
out.b.ready := Bool(true)
out.c.valid := Bool(false)
out.e.valid := Bool(false)
@@ -41,6 +71,44 @@ class TLAsyncCrossing(depth: Int = 8, sync: Int = 3) extends LazyModule
}
}
class TLAsyncCrossing(depth: Int = 8, sync: Int = 3) extends LazyModule
{
val nodeIn = TLInputNode()
val nodeOut = TLOutputNode()
val source = LazyModule(new TLAsyncCrossingSource(sync))
val sink = LazyModule(new TLAsyncCrossingSink(depth, sync))
val _ = (sink.node := source.node) // no monitor
val in = (source.node := nodeIn)
val out = (nodeOut := sink.node)
lazy val module = new LazyModuleImp(this) {
val io = new Bundle {
val in = nodeIn.bundleIn
val in_clock = Clock(INPUT)
val in_reset = Bool(INPUT)
val out = nodeOut.bundleOut
val out_clock = Clock(INPUT)
val out_reset = Bool(INPUT)
}
source.module.clock := io.in_clock
source.module.reset := io.in_reset
in.foreach { lm =>
lm.module.clock := io.in_clock
lm.module.reset := io.in_reset
}
sink.module.clock := io.out_clock
sink.module.reset := io.out_reset
out.foreach { lm =>
lm.module.clock := io.out_clock
lm.module.reset := io.out_reset
}
}
}
/** Synthesizeable unit tests */
import unittest._
@@ -51,8 +119,8 @@ class TLRAMCrossing extends LazyModule {
val cross = LazyModule(new TLAsyncCrossing)
model.node := fuzz.node
cross.node := TLFragmenter(4, 256)(model.node)
val monitor = (ram.node := cross.node)
cross.nodeIn := TLFragmenter(4, 256)(model.node)
val monitor = (ram.node := cross.nodeOut)
lazy val module = new LazyModuleImp(this) with HasUnitTestIO {
io.finished := fuzz.module.io.finished