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make NASTI -> MemIO converter compliant to AXI4 spec

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This commit is contained in:
Howard Mao 2015-08-06 12:46:32 -07:00
parent f7d9628de2
commit b046c57284
1 changed files with 15 additions and 5 deletions
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18
junctions/src/main/scala/nasti.scala
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@ -115,16 +115,26 @@ class MemIONASTISlaveIOConverter(cacheBlockOffsetBits: Int) extends MIFModule wi
require(mifDataBits == nastiXDataBits, "Data sizes between LLC and MC don't agree")
val (mif_cnt_out, mif_wrap_out) = Counter(io.mem.resp.fire(), mifDataBeats)
// according to the spec, we can't send b until the last transfer on w
val b_ok = Reg(init = Bool(true))
when (io.nasti.aw.fire()) { b_ok := Bool(false) }
when (io.nasti.w.fire() && io.nasti.w.bits.last) { b_ok := Bool(true) }
val id_q = Module(new Queue(UInt(width = nastiWIdBits), 2))
id_q.io.enq.valid := io.nasti.aw.valid
id_q.io.enq.bits := io.nasti.aw.bits.id
id_q.io.deq.ready := io.nasti.b.ready && b_ok
io.mem.req_cmd.bits.addr := Mux(io.nasti.aw.valid, io.nasti.aw.bits.addr, io.nasti.ar.bits.addr) >>
UInt(cacheBlockOffsetBits)
io.mem.req_cmd.bits.tag := Mux(io.nasti.aw.valid, io.nasti.aw.bits.id, io.nasti.ar.bits.id)
io.mem.req_cmd.bits.rw := io.nasti.aw.valid
io.mem.req_cmd.valid := (io.nasti.aw.valid && io.nasti.b.ready) || io.nasti.ar.valid
io.mem.req_cmd.valid := (io.nasti.aw.valid && id_q.io.enq.ready) || io.nasti.ar.valid
io.nasti.ar.ready := io.mem.req_cmd.ready && !io.nasti.aw.valid
io.nasti.aw.ready := io.mem.req_cmd.ready && io.nasti.b.ready
io.nasti.aw.ready := io.mem.req_cmd.ready && id_q.io.enq.ready
io.nasti.b.valid := io.nasti.aw.valid && io.mem.req_cmd.ready
io.nasti.b.bits.id := io.nasti.aw.bits.id
io.nasti.b.valid := id_q.io.deq.valid && b_ok
io.nasti.b.bits.id := id_q.io.deq.bits
io.nasti.b.bits.resp := UInt(0)
io.nasti.w.ready := io.mem.req_data.ready