Numerically controlled oscillator

A numerically controlled oscillator (NCO) is arranged to accumulate control values for each transition of a system clock to provide an accumulation signal and an edge signal. A speed multiplier value (N) is selected to simulate a desired clock resolution of N times the system clock resolution. The multi-phase predictive clock circuit is arranged to provide clock phase output signals that each correspond to a predicted clock phase as if the system clock where running at N times faster than the actual system clock. The edge detector circuit is arranged to compare values of adjacent clock phases to identify a transition in one of the clock phases. The phase encoder circuit is arranged to provide a phase signal that indicates a transition in one clock phase. The edge signal and the phase signal can be used for careful phase alignment control at effectively higher resolution.