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axi4: SRAM now reports errors on illegal address (#852)

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Wesley W. Terpstra 2017-07-07 19:27:32 -07:00 committed by GitHub
parent 4c595d175c
commit 025f7d890b
1 changed files with 9 additions and 3 deletions
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12
src/main/scala/amba/axi4/SRAM.scala
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@ -37,21 +37,26 @@ class AXI4RAM(address: AddressSet, executable: Boolean = true, beatBytes: Int =
val r_addr = Cat((mask zip (in.ar.bits.addr >> log2Ceil(beatBytes)).toBools).filter(_._1).map(_._2).reverse)
val w_addr = Cat((mask zip (in.aw.bits.addr >> log2Ceil(beatBytes)).toBools).filter(_._1).map(_._2).reverse)
val r_sel0 = address.contains(in.ar.bits.addr)
val w_sel0 = address.contains(in.aw.bits.addr)
val w_full = RegInit(Bool(false))
val w_id = Reg(UInt())
val w_user = Reg(UInt(width = 1 max in.params.userBits))
val r_sel1 = Reg(r_sel0)
val w_sel1 = Reg(w_sel0)
when (in. b.fire()) { w_full := Bool(false) }
when (in.aw.fire()) { w_full := Bool(true) }
when (in.aw.fire()) {
w_id := in.aw.bits.id
w_sel1 := w_sel0
in.aw.bits.user.foreach { w_user := _ }
}
val wdata = Vec.tabulate(beatBytes) { i => in.w.bits.data(8*(i+1)-1, 8*i) }
when (in.aw.fire()) {
when (in.aw.fire() && w_sel0) {
mem.write(w_addr, wdata, in.w.bits.strb.toBools)
}
@ -60,7 +65,7 @@ class AXI4RAM(address: AddressSet, executable: Boolean = true, beatBytes: Int =
in. w.ready := in.aw.valid && (in.b.ready || !w_full)
in.b.bits.id := w_id
in.b.bits.resp := AXI4Parameters.RESP_OKAY
in.b.bits.resp := Mux(w_sel1, AXI4Parameters.RESP_OKAY, AXI4Parameters.RESP_DECERR)
in.b.bits.user.foreach { _ := w_user }
val r_full = RegInit(Bool(false))
@ -72,6 +77,7 @@ class AXI4RAM(address: AddressSet, executable: Boolean = true, beatBytes: Int =
when (in.ar.fire()) {
r_id := in.ar.bits.id
r_sel1 := r_sel0
in.ar.bits.user.foreach { r_user := _ }
}
@ -82,7 +88,7 @@ class AXI4RAM(address: AddressSet, executable: Boolean = true, beatBytes: Int =
in.ar.ready := in.r.ready || !r_full
in.r.bits.id := r_id
in.r.bits.resp := AXI4Parameters.RESP_OKAY
in.r.bits.resp := Mux(r_sel1, AXI4Parameters.RESP_OKAY, AXI4Parameters.RESP_DECERR)
in.r.bits.data := Cat(rdata.reverse)
in.r.bits.user.foreach { _ := r_user }
in.r.bits.last := Bool(true)