diff options
Diffstat (limited to 'src/main/scala/firrtl/transforms/RemoveReset.scala')
| -rw-r--r-- | src/main/scala/firrtl/transforms/RemoveReset.scala | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/src/main/scala/firrtl/transforms/RemoveReset.scala b/src/main/scala/firrtl/transforms/RemoveReset.scala index f1434ad2..7f2207af 100644 --- a/src/main/scala/firrtl/transforms/RemoveReset.scala +++ b/src/main/scala/firrtl/transforms/RemoveReset.scala @@ -52,6 +52,7 @@ object RemoveReset extends Transform with DependencyAPIMigration { val resets = mutable.HashMap.empty[String, Reset] val asyncResets = mutable.HashMap.empty[String, Reset] val invalids = computeInvalids(m) + lazy val namespace = Namespace(m) def onStmt(stmt: Statement): Statement = { stmt match { case reg @ DefRegister(_, name, _, _, reset, init) if isPreset(name) => @@ -93,6 +94,17 @@ object RemoveReset extends Transform with DependencyAPIMigration { // addUpdate(info, Mux(reset, tv, fv, mux_type_and_widths(tv, fv)), Seq.empty) val infox = MultiInfo(reset.info, reset.info, info) Connect(infox, ref, expr) + /* Synchronously reset register that has reset value but only an invalid connection */ + case IsInvalid(iinfo, ref @ WRef(rname, tpe, RegKind, _)) if resets.contains(rname) => + // We need to mux with the invalid value to be consistent with async reset registers + val dummyWire = DefWire(iinfo, namespace.newName(rname), tpe) + val wireRef = Reference(dummyWire).copy(flow = SourceFlow) + val invalid = IsInvalid(iinfo, wireRef) + // Now mux between the invalid wire and the reset value + val Reset(cond, init, info) = resets(rname) + val muxType = Utils.mux_type_and_widths(init, wireRef) + val connect = Connect(info, ref, Mux(cond, init, wireRef, muxType)) + Block(Seq(dummyWire, invalid, connect)) case other => other.map(onStmt) } } |