riscv/rocket-chip
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Further refinement of tag_match/tag_hit signals

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This commit is contained in:
Henry Cook 2012-03-13 11:48:12 -07:00
parent d76b05bde1
commit 287bc1c262
1 changed files with 7 additions and 7 deletions
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14
rocket/src/main/scala/nbdcache.scala
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@ -776,11 +776,11 @@ class HellaCacheUniproc extends HellaCache with FourStateCoherence {
val cpu_req_tag = Cat(io.cpu.req_ppn, r_cpu_req_idx)(tagmsb,taglsb)
val tag_match_arr = (0 until NWAYS).map( w => isValid(meta.io.resp(w).state) && (meta.io.resp(w).tag === cpu_req_tag))
val tag_match = Cat(Bits(0),tag_match_arr:_*).orR
val hit_way_oh = Cat(Bits(0),tag_match_arr.reverse:_*)(NWAYS-1, 0) //TODO: use Vec
val tag_match_way_oh = Cat(Bits(0),tag_match_arr.reverse:_*)(NWAYS-1, 0) //TODO: use Vec
val tag_hit_arr = (0 until NWAYS).map( w => isHit(r_cpu_req_cmd, meta.io.resp(w).state) && (meta.io.resp(w).tag === cpu_req_tag))
val tag_hit = Cat(Bits(0),tag_match_arr:_*).orR
val meta_resp_way_oh = Mux(meta.io.way_en === ~UFix(0, NWAYS), hit_way_oh, meta.io.way_en)
val data_resp_way_oh = Mux(data.io.way_en === ~UFix(0, NWAYS), hit_way_oh, data.io.way_en)
val tag_hit = Cat(Bits(0),tag_hit_arr:_*).orR
val meta_resp_way_oh = Mux(meta.io.way_en === ~UFix(0, NWAYS), tag_match_way_oh, meta.io.way_en)
val data_resp_way_oh = Mux(data.io.way_en === ~UFix(0, NWAYS), tag_match_way_oh, data.io.way_en)
val meta_resp_mux = Mux1H(meta_resp_way_oh, meta.io.resp)
val data_resp_mux = Mux1H(data_resp_way_oh, data.io.resp)
@ -838,7 +838,7 @@ class HellaCacheUniproc extends HellaCache with FourStateCoherence {
meta.io.state_req.bits.inner_req.rw := Bool(true)
meta.io.state_req.bits.inner_req.idx := Reg(r_cpu_req_idx(indexmsb,indexlsb))
meta.io.state_req.bits.inner_req.data.state := Reg(new_hit_state)
meta.io.state_req.bits.way_en := Reg(hit_way_oh)
meta.io.state_req.bits.way_en := Reg(tag_match_way_oh)
meta.io.state_req.valid := Reg(set_hit_state, resetVal = Bool(false))
// pending store data, also used for AMO RHS
@ -847,7 +847,7 @@ class HellaCacheUniproc extends HellaCache with FourStateCoherence {
p_store_idx := r_cpu_req_idx
p_store_type := r_cpu_req_type
p_store_cmd := r_cpu_req_cmd
p_store_way_oh := Mux(r_replay_amo, r_way_oh, hit_way_oh)
p_store_way_oh := Mux(r_replay_amo, r_way_oh, tag_match_way_oh)
p_store_data := cpu_req_data
}
when (p_amo) {
@ -865,7 +865,7 @@ class HellaCacheUniproc extends HellaCache with FourStateCoherence {
mshr.io.req.bits.offset := r_cpu_req_idx(offsetmsb,0)
mshr.io.req.bits.cmd := r_cpu_req_cmd
mshr.io.req.bits.typ := r_cpu_req_type
mshr.io.req.bits.way_oh := Mux(tag_match, hit_way_oh, replaced_way_oh)
mshr.io.req.bits.way_oh := Mux(tag_match, tag_match_way_oh, replaced_way_oh)
mshr.io.req.bits.data := cpu_req_data
mshr.io.mem_rep <> io.mem.xact_rep