Selectable clocking architecture

A method of providing a first clock signal in (54) and a second the clock signal is connected to the serial switch circuit and conversion a switch circuit the data memory (52). With first and second clock signal having selecting with a reference clock signal synchronization. With the clock with the first or the second synchronous clock. A with a selecting the synchronous circuit is placed in the first working method in order to make the first clock and a reference clock synchronization or out of the second working method in order to make the second clock and a synchronous clock.