Continuous adaptive data capture optimization for interface circuits
US9425778B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 10, 2015 |
| Grant date | Aug 23, 2016 |
| Priority date | — |
| Expiry date | Sep 10, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K2005/00019
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A continuously adaptive timing calibration function for a data interface is disclosed. A first calibration method is performed for a mission data path, typically at power-on, to establish an optimal sample point. Reference data paths are established for a second calibration method that does not disturb normal system operation. Data bit edge transitions are examined at fringe timing points on either side of the optimal sample point. Assuming that a timing change for the edge transitions indicates a drift of the optimal sample point, when a drift amount is determined to be greater than a correction threshold value the optimal sampling point for the mission path is adjusted accordingly. At no point does the continuous calibration function determine that any data bit is invalid since the optimal sampling point is always maintained. Also, at no point does continuous calibration require successive alternating data bit values such as 1-0-1 or 0-1-0.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.