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:
Jun. 26, 2001
Filed:
Feb. 29, 2000
Martin A. K. Schwan, Chicago, IL (US);
3Com Corporation, Santa Clara, CA (US);
Abstract
A method and apparatus for reinitializing a galvanically isolated bus by clearing the bus when it is locked up. The reinitialization circuit monitors the state of the bus and recognizes when the bus is locked up in an artificial active state by timing the duration of this state. When the bus has been in an active state beyond a specified threshold time, the reinitialization circuit drives a selected set of bus lines to an idle or ground state. In another embodiment, a comparator detects any desynchronized condition across the bus interface. In one representative embodiment, the circuit may be incorporated into a bus connecting a link layer device to a physical layer device that is in communication with an IEEE 1394 interface.