Dynamic impedance control for input/output buffers
US8847623B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 29, 2011 |
| Grant date | Sep 30, 2014 |
| Priority date | — |
| Expiry date | Apr 16, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L25/028
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A system and method of performing off chip drive (OCD) and on-die termination (ODT) are provided. A common pull-up network composed of transistors and a common pull-down network composed of transistors are employed to implement both of these functions. In drive mode, the pull-up network is configured to produce a calibrated drive impedance when an “on” output is to be generated, and the pull-up network is configured to produce a calibrated drive impedance when an “off” output is to be generated. In termination mode, the pull-up network and the pull-down network are configured to produce a calibrated pull-up resistance and pull-down resistance respectively such that together, they form a split termination.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.