USB device and mode detecting method thereof
US7930441B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 26, 2007 |
| Grant date | Apr 19, 2011 |
| Priority date | — |
| Expiry date | Aug 4, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F13/4072
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A USB peripheral device and a method of determining USB speed mode. The method of determining USB speed mode for an USB peripheral device, wherein the USB peripheral device is coupled to an USB host through an USB transmission cable, and the USB transmission cable comprises power and ground lines for power supply, and first and second data signals for transmitting data, the method comprising the USB peripheral device pulling up voltage level of the first data signal with a first pull-up device, the USB peripheral device pulling up voltage level of the second data signal with a second pull-up device, and the USB host determining a high/full speed mode for the USB peripheral device, when detecting only one of the first and second data signals exceeding a threshold, and then detecting the other data signal exceeding the threshold in a predetermined period.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.