Method and apparatus for monitoring and compensating for skew on a high speed parallel bus
US7587640B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 27, 2005 |
| Grant date | Sep 8, 2009 |
| Priority date | — |
| Expiry date | Jul 9, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F13/4213
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Methods and apparatus are provided for monitoring and compensating for skew on a high speed parallel bus. Delay skew for a plurality of signals on a parallel bus is monitored by obtaining a plurality of samples of the plurality of signals for each unit interval; and identifying a location of transitions in the plurality of signals based on the samples. The samples can be obtained, for example, by sampling the plurality of signals using a plurality of latches and estimating a value of one or more of the plurality of signals by comparing values of the latches. A microprocessor can optionally be employed to determine a relative distribution of transitions in the plurality of signals and to align transitions in the plurality of signals to a common position. The transitions in the plurality of signals can be aligned to a common position by adjusting a delay control setting for a buffer associated with each of the plurality of signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.