Various methods and devices involving a slave device are discussed. The slave device, which may be without a clock input, receives a clock message and generates a clock based on the received clock message. In some embodiments, the slave device receives a further clock message and transmits a confirmation message simultaneously with receiving the further clock message. In other embodiments, determining a clock may comprise sampling the clock message with an internal system clock and providing the clock based on located edges. Other techniques are also discussed.