Method and circuit for trimming an internal oscillator of a USB device according to a counting number between a first and second clock count value
US8595543B2 · kind B2 · utility
3Cited by
11References
26Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 24, 2010 |
| Grant date | Nov 26, 2013 |
| Priority date | — |
| Expiry date | Jul 13, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L7/042
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A circuit and method for trimming an internal oscillator of a USB device that generates a clock signal as a frequency source of the USB device detect an end of packet from an input data stream to initialize a counter, identify a token packet in the data stream to detect a start of frame token packet for the counter to carry out clock counting on the clock signal to thereby obtain a count value, and compare the count value with a reference value to determine a trimming code for trimming a clock frequency of the internal oscillator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.