Serial communication circuit with display detector interface bypass circuit
US6847335B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 29, 1998 |
| Grant date | Jan 25, 2005 |
| Priority date | — |
| Expiry date | Oct 29, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2370/047
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A circuit and method serves as a slave interface to support both register read/write and monitor detection operations by a graphics controller chip, or other display data source, with a plurality of display devices. The circuit supports differing monitor detection protocols including, for example, I2C protocol and non-DDC type protocols. The circuit may be set in two modes, a register mode and a bypass mode. The register mode is used to facilitate standard I2C protocol to a display device. Display detection bypass circuitry is used to selectively bypass the register based display detector interface by connecting input pins to any two of a plurality of I/O pins so that the system may be used for monitor detection of a plurality of different display devices, such as CRTs and LCDs to facilitate multiprotocol display detection.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.