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. 17, 1997
Filed:
Apr. 21, 1995
Yoshiko Yamada, Amagasaki, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A communication circuit fault detector tests a communication circuit by using a sequence generator to generate a test signal, a memory circuit to temporarily store the test signal, and a multiplexer to multiplex the test signal and an input data signal into the communication circuit. A timing generator drives the communication circuit at a rate higher than the normal communication rate, enabling the data signal and test signal to be sent through the communication circuit simultaneously. A demultiplexer demultiplexes the output signal from the communication circuit into an output data signal and a returned test signal. A comparator compares the returned test signal with the test signal stored in the memory circuit and generates a result signal indicating whether they match.