Synchronous clock switching circuit for multiple asynchronous cl

Details Synchronous clock switching circuit for multiple asynchronous cl Synchronous clock switching circuit for multiple asynchronous cl

1998-09-08

2000-08-22

Cunningham, Terry D.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

Having selection between plural continuous waveforms

327298, 327407, H03K 1700

Patent

active

061078417

ABSTRACT:
A clock switching system for providing synchronous glitch-free switching of a clock source from among one or more asynchronous clock sources comprises a multiplexor device for providing a system clock output signal corresponding to a first asynchronous clock source input, and a switch control circuit for generating first and second control signal. In response to the first control signal, the multiplexor device enables simultaneous coupling of a selected second asynchronous clock source to be switched to the multiplexor circuit, and decoupling the first asynchronous clock source input. Further in response to the first control signal, the system clock output is held at a first output level. In response to the second control signal, the second asynchronous clock source is coupled to the system clock output while both signals are at the first output level. The system clock output corresponding to the second asynchronous clock source occurs in synchronism with a subsequent transition of the second asynchronous clock source from the first voltage level to a second output level.

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