Browse Prior Art Database

Overlapped Parity Check for Read/Modify/Write

IP.com Disclosure Number: IPCOM000052309D
Original Publication Date: 1981-May-01
Included in the Prior Art Database: 2005-Feb-11

Publishing Venue

IBM

Related People

Authors:
Bushaw, KA Rositer, DJ [+details]

Abstract

The above circuitry provides a parity check for READ/MODIFY/ WRITE of one field in a binary word. The parity check of the write modification is accomplished without an additional parity generator. The field to be modified is forced to a predetermined condition before the modified write. The parity of this predetermined condition is known. Therefore, the parity of the modified field plus the parity of the word can be used to check whether the modified field is properly received and written.