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rocket-chip/src/main/scala/uncore/tilelink2/Buffer.scala
2016-09-05 20:58:41 -07:00

48 lines
1.2 KiB
Scala

// See LICENSE for license details.
package uncore.tilelink2
import Chisel._
class TLBuffer(entries: Int = 2, pipe: Boolean = false) extends LazyModule
{
val node = TLIdentityNode()
lazy val module = new LazyModuleImp(this) {
val io = new Bundle {
val in = node.bundleIn
val out = node.bundleOut
}
val in = io.in(0)
val out = io.out(0)
out.a <> Queue(in .a, entries, pipe)
in .d <> Queue(out.d, entries, pipe)
val edge = node.edgesOut(0) // same as edgeIn(0)
if (edge.manager.anySupportAcquire && edge.client.anySupportProbe) {
in .b <> Queue(out.b, entries, pipe)
out.c <> Queue(in .c, entries, pipe)
out.e <> Queue(out.e, entries, pipe)
} else {
in.b.valid := Bool(false)
in.c.ready := Bool(true)
in.e.ready := Bool(true)
out.b.ready := Bool(true)
out.c.valid := Bool(false)
out.e.valid := Bool(false)
}
}
}
object TLBuffer
{
// applied to the TL source node; connect (TLBuffer(x.node) -> y.node)
def apply(x: TLBaseNode, entries: Int = 2, pipe: Boolean = false)(implicit lazyModule: LazyModule): TLBaseNode = {
val buffer = LazyModule(new TLBuffer(entries, pipe))
lazyModule.connect(x -> buffer.node)
buffer.node
}
}