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An X literal such as `case ... default: y = 'x;` reaches the cone compiler as an X-constant net, which had no leaf representation: the cone was dropped as unknown-constant and every output depending on it went unproved, although the dual-rail encoding can represent X. Give each X-constant net its own variable when SEC asks for it, and make SEC publish that variable as a state bit with no initial value whose next state is itself: permanently X under the dual-rail encoding, so a binary value on the other side is not a binary-defined difference, which is the usual don't-care reading. Unused X states are pruned, the structured memory control-pin path keeps treating an X write enable as a disabled write, LEC is unchanged, and Z literals remain unsupported.
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An X literal such as
case ... default: y = 'x;reaches the cone compiler as an X-constant net, which had no leaf representation: the cone was dropped as unknown-constant and every output depending on it went unproved, although the dual-rail encoding can represent X.Give each X-constant net its own variable when SEC asks for it, and make SEC publish that variable as a state bit with no initial value whose next state is itself: permanently X under the dual-rail encoding, so a binary value on the other side is not a binary-defined difference, which is the usual don't-care reading. Unused X states are pruned, the structured memory control-pin path keeps treating an X write enable as a disabled write, LEC is unchanged, and Z literals remain unsupported.