Browse Prior Art Database

Data Clocking

IP.com Disclosure Number: IPCOM000084754D
Original Publication Date: 1976-Jan-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 45K

Publishing Venue

IBM

Related People

Bigelow, GA: AUTHOR

Abstract

Data transfer rates on digital communication lines such as computer interfaces, telecommunication lines, and the like, are enhanced while maintaining verification and integrity by supplying a timing or tag signal along with the data signal on a separate line. The tag signal gates the data signal to the receiver maintaining synchronism irrespective of noise conditions on the line.

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Data Clocking

Data transfer rates on digital communication lines such as computer interfaces, telecommunication lines, and the like, are enhanced while maintaining verification and integrity by supplying a timing or tag signal along with the data signal on a separate line. The tag signal gates the data signal to the receiver maintaining synchronism irrespective of noise conditions on the line.

In a single-channel version, the transitions of tag line signals actuate the receiver to sense data on the data line(s). The phase shift tolerance between the tag signal and the data signal is indicated by the vertical dash lines defining the respective data windows. Noise occurring intermediate the data windows is ignored by the receiver. The illustrated scheme permits the tag line frequency to be one half the frequency required if full pulses were used to indicate data sensing time.

The above principle can be applied to a split-channel timing, wherein a single tag line signal times two data lines which are in alternate synchronism. Alternate synchronism enables a high-data rate while maintaining a high degree of integrity. The data line(s) 1 and data line(s) 2 data periods are staggered 90 degrees with the respective sensing periods X and Y also being staggered, and being effectively twice the duration of the data windows for the single-channel timing.

The phasing and sensing is achieved by associating the positive-going transitions of the tag signal with the data line 1...