Method and apparatus for clock selection and switching
US6226699A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 25, 1998 |
| Grant date | May 1, 2001 |
| Priority date | — |
| Expiry date | Jun 25, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F13/4068
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A circuit for isolating a device from a bus includes a local clock, a clock multiplexer, and control logic. The clock multiplexer has a first input terminal coupled to the local clock, a second input terminal coupled to the first clock line of the bus, a control input terminal, and an output terminal. The output terminal is adapted to provide an output clock signal to the device. The control logic is coupled to the control input of the clock multiplexer and adapted to detect a bus isolation event. The control logic is further adapted to generate a bus isolation signal in response to the bus isolation event and provide the bus isolation signal to the control input of the clock multiplexer. A method is provided for isolating a device from a bus. The method includes detecting a bus isolation event. An isolation signal is generated in response to the bus isolation event. One of a local clock signal and a first clock signal provided by the bus is selected based on the isolation signal. An output clock signal is generated based on the selected one of the local clock signal and the first clock signal. Generating the output clock signal includes changing the output clock signal at a predet…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.