Techniques for facilitating conversion between asynchronous and synchronous domains

[Solution means] The interface used between an asynchronous domain and a synchronous domain is indicated. An asynchronous domain is characterized by transmission of the data based on a delay insusceptible handshake protocol. A synchronous domain is characterized by transmission of the data based on changes of a clock signal. An interface contains the data path which can transmit a data token between domains. An interface answers changes of a clock signal, and at least one completion of a handshake protocol, and includes further the control circuit which can enable transmission of the data token through a data path.