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US 6,806,755 B1Granted
Technique for glitchless switching of asynchronous clocks
AssigneeQuantum 3D
InventorAlan Christopher Simmonds
Life of this patent
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Abstract
A technique for glitchless switching among different frequency input clocks in a circuit includes monitoring each of the clocks and determining when the relative phases of the respective clocks are within a predetermined maximum of phase difference. Once the relative phases of the respective clocks are within an acceptable range, the system switches from one clock to another.
Claims1
In a circuit, a method for switching among at least two clocks of different frequencies comprising the steps of
- providing a first input clock of a first frequency,
- providing a second input clock of a second frequency, different from the first frequency,
- monitoring the relative phase difference between the first and second clocks,
- detecting when the relative phase difference is less than a permissible maximum,
- switching from the first clock to the second clock when the phase difference is less than the permissible maximum.
2 more elements
Dependencies are inferred from the claim text.