Browse Prior Art Database

Method to Reduce Soft Errors in Control Stores by Use of Self Checking

IP.com Disclosure Number: IPCOM000041003D
Original Publication Date: 1987-May-01
Included in the Prior Art Database: 2005-Feb-02

Publishing Venue

IBM

Related People

Authors:
Wade, WT [+details]

Abstract

To provide error detection and correction, control stores are divided into two halves, each with its own error correcting code (ECC) hardware address counter and controls. Control programs are written such that each half of the control store is used by the system every other cycle. During the off cycle in each half, a separate address counter checks each address (one per off-cycle) to detect and correct an error using ECC. Thus, soft errors are nearly completely eliminated and hard errors are detected by a recheck and further use of a bad address may be avoided.