Pseudo synchronous clocking

摘要

Two systems of synchronous logic with dissimilar maximum clocking rate requirements use a single oscillating source to derive pseudo synchronous logic related clock signals having desired mutual properties. The periods of the clock T1 and T2 form the relationship <IMAGE> where S is a rational number and alpha is a largest denominator of T1 and T2. alpha then can be used to define a window that permits the transfer of data pulses from one of the systems to another without metastable conditions occurring in latch circuits.