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Preliminary Synchronization of Controlled Data Link Between a Processor and a Controlled Tool

IP.com Disclosure Number: IPCOM000051905D
Original Publication Date: 1981-Mar-01
Included in the Prior Art Database: 2005-Feb-11

Publishing Venue

IBM

Related People

Authors:
Baker, DC Haydon, FC [+details]

Abstract

The interface between the processor and the controlled tool limited distance controller (LDC) provided by the output shown in the figure is controlled by an advanced data link controller (ADLC). During normal operation, the LDC receive clock is self-synchronizing; i.e., the transitions indicative of the change in plurality of the binary data are also utilized to self-synchronize the controller. Since such transitions in the binary data cause synchronization, the present expedient proposes that a preliminary synchronization expedient be provided before the real data comes across; i.e., upon an indication that data is coming, the predetermined synchronization sequence passes through the LDC having a predetermined number of transitions which will synchronize the LDC receive clock before the true data comes across.