riscv/rocket-chip
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reduce usage of CAMs in converters

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This commit is contained in:
Howard Mao 2016-07-13 11:08:36 -07:00
parent 8aa73915a1
commit de1e25f3d1
2 changed files with 11 additions and 16 deletions
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20
uncore/src/main/scala/converters/Nasti.scala
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@ -36,28 +36,26 @@ class IdMapper(val inIdBits: Int, val outIdBits: Int,
val nOutXacts = 1 << outIdBits
val out_id_free = Reg(init = Vec.fill(nOutXacts){Bool(true)})
val in_id_free = Reg(init = Vec.fill(nInXacts){Bool(true)})
val next_out_id = PriorityEncoder(out_id_free)
val id_mapping = Reg(Vec(nInXacts, UInt(0, outIdBits)))
val id_valid = Reg(init = Vec.fill(nInXacts){Bool(false)})
val id_mapping = Reg(Vec(nOutXacts, UInt(0, inIdBits)))
val req_fire = io.req.valid && io.req.ready
when (req_fire) {
out_id_free(io.req.out_id) := Bool(false)
id_valid(io.req.in_id) := Bool(true)
id_mapping(io.req.in_id) := io.req.out_id
in_id_free(io.req.in_id) := Bool(false)
id_mapping(io.req.out_id) := io.req.in_id
}
when (io.resp.valid) {
out_id_free(io.resp.out_id) := Bool(true)
id_valid(io.resp.in_id) := Bool(false)
in_id_free(io.resp.in_id) := Bool(true)
}
io.req.ready := out_id_free.reduce(_ || _) && !id_valid(io.req.in_id)
io.req.ready := out_id_free.reduce(_ || _) && in_id_free(io.req.in_id)
io.req.out_id := next_out_id
val id_matches = id_mapping.map(_ === io.resp.out_id)
val id_matches_valid = id_matches.zip(id_valid).map { case (m, v) => m && v }
io.resp.matches := id_matches_valid.reduce(_ || _)
io.resp.in_id := PriorityEncoder(id_matches_valid)
io.resp.in_id := id_mapping(io.resp.out_id)
io.resp.matches := !out_id_free(io.resp.out_id)
}
}
@ -102,7 +100,7 @@ class NastiIOTileLinkIOConverter(implicit p: Parameters) extends TLModule()(p)
// Reorder queue saves extra information needed to send correct
// grant back to TL client
val roq = Module(new ReorderQueue(
new NastiIOTileLinkIOConverterInfo, nastiRIdBits, tlMaxXacts))
new NastiIOTileLinkIOConverterInfo, nastiRIdBits, Some(tlMaxXacts)))
val get_id_mapper = Module(new IdMapper(tlClientXactIdBits, nastiXIdBits))
val put_id_mapper = Module(new IdMapper(tlClientXactIdBits, nastiXIdBits))

7
uncore/src/main/scala/converters/Tilelink.scala
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@ -55,11 +55,8 @@ class ClientTileLinkIOUnwrapper(implicit p: Parameters) extends TLModule()(p) {
val acqArb = Module(new LockingRRArbiter(new Acquire, 2, tlDataBeats,
Some((acq: Acquire) => acq.hasMultibeatData())))
val acqRoq = Module(new ReorderQueue(
Bool(), tlClientXactIdBits, tlMaxClientsPerPort))
val relRoq = Module(new ReorderQueue(
Bool(), tlClientXactIdBits, tlMaxClientsPerPort))
val acqRoq = Module(new ReorderQueue(Bool(), tlClientXactIdBits))
val relRoq = Module(new ReorderQueue(Bool(), tlClientXactIdBits))
val iacq = io.in.acquire.bits
val irel = io.in.release.bits