Coarse equalizer adaptation and rate detection for high-speed retimers
US11621715B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 11, 2022 |
| Grant date | Apr 4, 2023 |
| Priority date | — |
| Expiry date | Jan 11, 2042 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L7/0337
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Systems, circuitry and methods measure data transition metrics of incoming data, average the measurements of each metric at a set time interval for multiple intervals to generate multiple averaged values, and select a maximum of the multiple averaged values for each metric. The maximum values of each measurement cycle are compared with corresponding multiple thresholds defining respective ranges, and the outputs are used by a state machine to determine an equalization level and the rate of the incoming data. When the thresholds are not met, the state machine adjusts the equalization level, and when a sub-rate is detected using a third threshold for one of the metrics, the clock rate is also adjusted. Locking of a clock and data recovery (CDR) circuit is attempted when the maximum values for each metric are within their respective ranges.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.