The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 10, 2011
Filed:
Jan. 23, 2008
Min-kun Wang, Hukou Township, Hsinchu County, TW;
Min-hsiung HU, Kaohsiung, TW;
Chuen-an Lin, Jhubei, TW;
Min-Kun Wang, Hukou Township, Hsinchu County, TW;
Min-Hsiung Hu, Kaohsiung, TW;
Chuen-An Lin, Jhubei, TW;
Holtek Semiconductor Inc., Hsinchu, TW;
Abstract
A universal series bus (USB) frequency synchronous apparatus using a start of frame (SOF) signal generated by a master device to mark a reference interval is disclosed. The frequency synchronizing apparatus includes a frequency divider, a counter unit with a default pulse number, an arithmetic unit, and an adjusting unit. The frequency divider divides a high frequency signal by a variable frequency factor to generate a lock frequency signal. The counter is used to detect a pulse number of the lock frequency signal at a reference interval and obtain a pulse difference between the default pulse number and the detected pulse number of the lock frequency signal.