Isochronic fork
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Isochronic forks are forks in wires where if the acknowledging target has seen a transition on their end of the fork then the transition is assumed to have also happened on the other end of the fork too. There are two types of isochronic forks; the asymmetric types only ensure that the signal will reach the acknowledging fork tip before, or at the same time as, it will at the other fork tip, while the symmetric type ensures that both fork tips will be reached at the same time. Symmetrical isochronic forks allow either of the targets to acknowledge the signal. In QDI circuits all forks have to be either isochronic and acknowledged by one of the destinations, or acknowledged by all destinations.
