Oscillators – Plural oscillators – Selectively connected to common output or oscillator...
Patent
1992-07-30
1994-02-22
Pascal, Robert J.
Oscillators
Plural oscillators
Selectively connected to common output or oscillator...
307219, 307269, 370105, 375104, 375108, 375118, 331 2, 331 7, 331 14, 331 46, 331 55, 331 64, H03B 2700, H01J 1982, H04B 110
Patent
active
052891380
ABSTRACT:
An apparatus is provided for synchronously selecting different oscillators as the system clock source. The apparatus is comprised of two oscillator selectors. Each of the oscillator selectors has as its inputs the output of each of the oscillators and a three-bit command code which indicates which of the oscillators is to be selected by the oscillator selector and a single clock output. A different oscillator may be selected by each of the oscillator selectors at the same time. The output of the oscillator selectors are inputs to the clock controller. The clock controller also receives command signals for controlling the switching of the clock controller between the outputs of the two oscillator selectors. The output of the clock controller is the clock source for the system and a status signal indicating which oscillator selector is presently being used.
REFERENCES:
patent: 3594656 (1971-07-01), Tsukamoto
patent: 4229699 (1980-10-01), Frissell
patent: 4882738 (1989-11-01), Suzuki
Amdahl Corportion
Kinkead Arnold
Pascal Robert J.
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