Browse Prior Art Database

Providing Synchronization and Odd Parity

IP.com Disclosure Number: IPCOM000076943D
Original Publication Date: 1972-May-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Johnson, HW: AUTHOR

Abstract

In a data-storage system employing nonreturn-to-zero (NRZI) encoding with multibit bytes for characters, a "hot bit" is employed to provide both synchronization and an odd-parity check. For example, when an all zeros pattern appears, it is necessary to insert a sync bit in the byte so that the data phase-lock oscillator maintains proper synchronization. The sync bit is so positioned in the byte, that for any given pattern, odd-parity detection may be accomplished. The bit may be inserted in any position of the byte depending on the bit pattern.

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Providing Synchronization and Odd Parity

In a data-storage system employing nonreturn-to-zero (NRZI) encoding with multibit bytes for characters, a "hot bit" is employed to provide both synchronization and an odd-parity check. For example, when an all zeros pattern appears, it is necessary to insert a sync bit in the byte so that the data phase- lock oscillator maintains proper synchronization. The sync bit is so positioned in the byte, that for any given pattern, odd-parity detection may be accomplished. The bit may be inserted in any position of the byte depending on the bit pattern.

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