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:
Oct. 09, 1990
Filed:
May. 31, 1989
Kuniharu Itoh, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
A circuit for detecting a code violation in an alternate mark inversion signal comprises a first detecting circuit receiving the alternate mark inversion signal for generating a first detection signal at continuous occurrence of two first polarity signals without an intervening signal of a second polarity, the first and second polarity signals being indicative of the same binary logical level, and a second detecting circuit receiving the alternate mark inversion signal for generating a second detection signal at continuous occurrence of two second polarity signals without interleaving the first polarity signal. The first detection signal is inputted to a first enable signal generating circuit for generating a first enable signal having a predetermined active period, and the second detection signal is inputted to a second enable signal generating circuit for generating a second enable signal having a predetermined active period. A first violation detection circuit receives the second detection signal and the first enable signal and generates a first code violation detection signal when the second detection signal is generated during the active period of the first enable signal. A second violation detection circuit receives the first detection signal and the second enable signal and generates a second code violation detection signal when the first detection signal is generated during the active period of the second enable signal.