Synchronous clock source selector

Details Synchronous clock source selector Synchronous clock source selector

1990-08-31

1992-03-24

Westin, Edward P.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307480, 328 63, H03K 513, H03K 1900

Patent

active

050991400

ABSTRACT:
A clock source selector provides at least one set of clock signals selected from a plurality of clock sources and a synchronized transition from an old clock source to a new clock source. The clock source selector includes a gate having an output for providing the clock signals, a selector coupled between the plurality of clock sources and the gate for providing the gate with clock signals from selected ones of the clock sources responsive to selection signals, a detector for detecting a change in the selection signals from an old clock source to a new clock source, and a synchronizing circuit responsive to the detector for disabling the gate in synchronism with the old clock source and thereafter enabling the gate in synchronism with the new clock source.

REFERENCES:
patent: 4229699 (1980-10-01), Frissell
patent: 4651103 (1987-03-01), Grimes
patent: 4686386 (1987-08-01), Tadao
patent: 4794596 (1988-12-01), Gloyne et al.
patent: 4965524 (1990-10-01), Patchen

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