Methods and apparatus for performing runtime data eye monitoring and continuous data strobe calibration
US9401189B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 15, 2013 |
| Grant date | Jul 26, 2016 |
| Priority date | — |
| Expiry date | Feb 27, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C2029/0409
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Integrated circuits may include memory interface circuitry operable to communicate with system memory. The memory interface circuitry may receive data (DQ) and data strobe (DQS) signals from system memory during read operations. The memory interface circuitry may include startup calibration circuitry and runtime calibration circuitry. The startup calibration circuitry may be used upon device startup to perform a one-time data de-skew and DQ/DQS centering. The runtime calibration circuitry may include at least two data sampling circuits, a first of which is used in active mode to latch incoming data and a second of which is used in redundant mode to obtain data eye boundary information on a continuous basis. The received DQS signal may be adjusted based on the obtained eye boundary information so that DQS properly positioned within the data eye periodically or on an as-needed basis.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.