Method and circuitry for extracting clock in clock data recovery system
US7616722B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 8, 2005 |
| Grant date | Nov 10, 2009 |
| Priority date | — |
| Expiry date | Jan 26, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L7/02
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A method for extracting a clock in a clock data recovery system is provided. The method includes the following steps. First, a serial link transmission data is sampled for a plurality of times, and a plurality of pulse signals are generated and sequentially arranged. Then, a mark is inserted after all pulse signals are generated and had been delayed for a predetermined delay time. The predetermined delay time is less than a period between two adjacent pulse signals, and a period between two adjacent pulse signals is divided into two sub-periods by the predetermined delay time. Then, it is checked whether the data status in each sub-period is changed or not, and this operation is repeated for a predetermined number of times. Finally, the clock is extracted when a pulse signal of no data status change within the predetermined number of times is being generated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.