Universal serial bus keyboard system
US5802318A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 25, 1995 |
| Grant date | Sep 1, 1998 |
| Priority date | — |
| Expiry date | Jul 25, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F13/126
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A keyboard system according to the present invention includes a serial bus host controller coupled to a serial bus keyboard. The keyboard includes both keyboard scan logic and scan code conversion logic for passing to the host controller over the serial bus. The host controller includes circuitry for processing the data between the serial bus and a host bus. The host controller further includes 8042 emulation logic for providing a hardware compatible interface to the keyboard controller. The 8042 emulation logic also includes circuitry for communicating over the serial bus during times when the serial bus has not yet been initialized.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.