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:
Feb. 26, 2002
Filed:
Jun. 29, 1998
Gary S. Murdock, San Jose, CA (US);
National Semiconductro Corporation, Santa Clara, CA (US);
Abstract
A highly efficient bit encoder and a method related thereto are provided. The bit encoder transmit DC-balanced digital signals over a transmission line. To provide a DC-balanced signal, an input word's single-word disparity (SWD) value is compared to a running word disparity (RWD) value retrieved from a memory register. The RWD value indicates the cumulative DC-imbalance on the transmission line. If the disparity relationship of the SWD and the RWD satisfy a set of predefined rules, the input word is inverted to thereby offset the RWD. An inversion bit is appended to the digital input word to provide an output digital word to indicate to a receiver whether the transmitted output word is inverted to thereby permit recovery of the original system word. In one application, the DC-balanced signal transmits alternately control words and data words. A clock signal is transmitted on a separate clock transmission line to provide a clock signal for timing purposes and an embedded control signal indicating control or data mode.