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:
Mar. 22, 2005
Filed:
Aug. 28, 2001
Applicants:
Keiki Watanabe, Tachikawa, JP;
Takashi Harada, Hidaka, JP;
Satoshi Ueno, Ome, JP;
Inventors:
Assignee:
Hitachi, Ltd., Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G06F011/00 ;
U.S. Cl.
CPC ...
Abstract
A semiconductor integrated circuit device includes a transmitting circuit capable of converting first parallel signals to a first serial signal, a receiving circuit capable of converting a second serial signal to second parallel signals, a test signal generating circuit, and an operation judging circuit, all of which are formed on a single semiconductor chip. The test signal generating circuit and the operation judging circuit are formed so as to operate in accordance with a clock having a frequency corresponding to a transfer rate of the first or second parallel signals.