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:
Nov. 26, 2002
Filed:
Jan. 16, 2001
Miki Yanagawa, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
According to an aspect of the present invention there is provided an LSI device having an output terminal outputting a data, comprising a data output circuit connected to the output terminal and capable of adjusting an output impedance thereof; and an adjustment circuit which detects a transient voltage at the output terminal when an output logic of the data output circuit is switched in a condition that a transmission line not terminated by a terminating resistor is connected to the output terminal, compares the transient voltage with a reference voltage, and adjusts the output impedance of the data output circuit so as to match a characteristic impedance of the transmission line. According to the present invention, as the transient voltage of the output terminal connected to the transmission line is detected, and the output impedance of the data output circuit is adjusted, it is possible to adjust so that output impedance of the data output circuit is matched with characteristic impedance of the transmission line even if manufacture processes, use temperatures, power supply voltages, characteristic impedance of the transmission line, or the like fluctuates or is changed.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile