Data storage system with stale data detector and method of opera

Details Data storage system with stale data detector and method of opera Data storage system with stale data detector and method of opera

1992-11-16

1995-08-01

Beausoliel, Jr., Robert W.

Excavating

371 53, 371 511, G06F 1100, G08C 2500, H03M 1300, H04L 100

Patent

active

054385750

ABSTRACT:
A low cost, high speed data storage system provides word-by-word stale data detection while avoiding the need to both read and write a single memory location during a memory read operation. Two flag data storage bits are provided for each word location in addition to the normal data storage bits. As blocks of data are received by the storage system one of the two flag bits is assigned to the block on an alternating basis. Upon writing data to an address location, an assigned flag bit is written to a first state to indicate valid data. When reading, the corresponding assigned flag bit is output as a stale or invalid data signal and the nonassigned flag bit is set to a second state different from the first state in preparation for the next block of data.

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"Decision Making with Flags" in Computer Design Article by Donaghey found in V15 N12 Dec. 1976 pp. 77-83.

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