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tilelink2 Buffer: increase the minLatency on ports

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This commit is contained in:
Wesley W. Terpstra 2016-09-21 18:00:57 -07:00
parent 05beb20dc4
commit c115913624
1 changed files with 24 additions and 9 deletions
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33
src/main/scala/uncore/tilelink2/Buffer.scala
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@ -4,10 +4,20 @@ package uncore.tilelink2
import Chisel._
import chisel3.internal.sourceinfo.SourceInfo
import scala.math.max
class TLBuffer(entries: Int = 2, pipe: Boolean = false) extends LazyModule
// pipe is only used if a queue has depth = 1
class TLBuffer(a: Int = 2, b: Int = 2, c: Int = 2, d: Int = 2, e: Int = 2, pipe: Boolean = true) extends LazyModule
{
val node = TLIdentityNode()
require (a >= 0)
require (b >= 0)
require (c >= 0)
require (d >= 0)
require (e >= 0)
val node = TLAdapterNode(
clientFn = { seq => seq(0).copy(minLatency = seq(0).minLatency + max(1,b) + max(1,c)) },
managerFn = { seq => seq(0).copy(minLatency = seq(0).minLatency + max(1,a) + max(1,d)) })
lazy val module = new LazyModuleImp(this) {
val io = new Bundle {
@ -16,13 +26,13 @@ class TLBuffer(entries: Int = 2, pipe: Boolean = false) extends LazyModule
}
((io.in zip io.out) zip (node.edgesIn zip node.edgesOut)) foreach { case ((in, out), (edgeIn, edgeOut)) =>
out.a <> Queue(in .a, entries, pipe)
in .d <> Queue(out.d, entries, pipe)
if (a>0) { out.a <> Queue(in .a, a, pipe && a<2) } else { out.a <> in.a }
if (d>0) { in .d <> Queue(out.d, d, pipe && d<2) } else { in.d <> out.d }
if (edgeOut.manager.anySupportAcquire && edgeOut.client.anySupportProbe) {
in .b <> Queue(out.b, entries, pipe)
out.c <> Queue(in .c, entries, pipe)
out.e <> Queue(in .e, entries, pipe)
if (b>0) { in .b <> Queue(out.b, b, pipe && b<2) } else { in.b <> out.b }
if (c>0) { out.c <> Queue(in .c, c, pipe && c<2) } else { out.c <> in.c }
if (e>0) { out.e <> Queue(in .e, e, pipe && e<2) } else { out.e <> in.e }
} else {
in.b.valid := Bool(false)
in.c.ready := Bool(true)
@ -38,8 +48,13 @@ class TLBuffer(entries: Int = 2, pipe: Boolean = false) extends LazyModule
object TLBuffer
{
// applied to the TL source node; y.node := TLBuffer(x.node)
def apply(x: TLBaseNode, entries: Int = 2, pipe: Boolean = false)(implicit sourceInfo: SourceInfo): TLBaseNode = {
val buffer = LazyModule(new TLBuffer(entries, pipe))
def apply(x: TLBaseNode) (implicit sourceInfo: SourceInfo): TLBaseNode = apply(x, 2)
def apply(x: TLBaseNode, entries: Int) (implicit sourceInfo: SourceInfo): TLBaseNode = apply(x, entries, true)
def apply(x: TLBaseNode, entries: Int, pipe: Boolean) (implicit sourceInfo: SourceInfo): TLBaseNode = apply(x, entries, entries, pipe)
def apply(x: TLBaseNode, ace: Int, bd: Int) (implicit sourceInfo: SourceInfo): TLBaseNode = apply(x, ace, bd, true)
def apply(x: TLBaseNode, ace: Int, bd: Int, pipe: Boolean)(implicit sourceInfo: SourceInfo): TLBaseNode = apply(x, ace, bd, ace, bd, ace, pipe)
def apply(x: TLBaseNode, a: Int, b: Int, c: Int, d: Int, e: Int, pipe: Boolean = true)(implicit sourceInfo: SourceInfo): TLBaseNode = {
val buffer = LazyModule(new TLBuffer(a, b, c, d, e, pipe))
buffer.node := x
buffer.node
}