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Browse Prior Art Database

SYNCHRONIZATION OF SERIAL DATA COMMUNICATION

IP.com Disclosure Number: IPCOM000015306D
Original Publication Date: 2002-Jul-01
Included in the Prior Art Database: 2003-Jun-20

Publishing Venue

IBM

Abstract

Disclosed is a method to synchronize a serial data link while using a multi Level communication system. The basic idea is to use special symbol, which is not '1' or '0', in order to indicate the 'sync' position, which periodicaly separates between data groups. Beside the indication of groups boundaries, the sync is an elegant way to synchronize the Receiver, with or without PLL (Phase Locked Loop). In ordinary binary serial links there is no sync bit possibility because it can't be distinguished from the data. As a result, the clock must be embedded with the data in some other code: Manchester, 8/10, 64/66... etc. None of those embedded codes has the feature of dividing the data into equal groups (bytes, words, etc.). However, in multi Level system, the sync bit can easily be implemented by another Level (see Fig. 1). Thus yielding a straight forward method to separate between data groups. sync bit sync bit data