Method and apparatus for controlling phase of a system clock sig

Details Method and apparatus for controlling phase of a system clock sig Method and apparatus for controlling phase of a system clock sig

1993-01-15

1994-12-13

Mis, David

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 14, 331 18, 331 25, 331 49, H03L 700, H03L 706, H03L 708, H03L 714

Patent

active

053732545

ABSTRACT:
A method and apparatus for controlling the phase of a system clock, in which one of a first clock signal and a second clock signal is selected and output to a system as a system clock signal, the first clock signal being generated by a frequency synthesizer synchronized with an external clock signal supplied from a reference clock signal oscillator provided externally of the system, and the second clock signal being supplied from another reference clock signal oscillator provided internally of the system, and the phases of the first and second clock signals are controlled, prior to switching between the first and second clock signals and supplying the switched clock signal to the system as the system clock signal. The switching is delayed for a period while there is a phase shift between the first and second clock signal , when the system clock signal is switched between the first and second clock signal.

REFERENCES:
patent: 5089793 (1992-02-01), Nagao
patent: 5122677 (1992-06-01), Sato
patent: 5142247 (1992-08-01), Lada, Jr. et al.
patent: 5235292 (1993-08-01), Endo et al.

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