Memory block protection apparatus

Details Memory block protection apparatus Memory block protection apparatus

Filed on

1977-01-18

Date issued

1978-07-04

Examiner

Chapnick, Melvin B.

Patent Class

Boots, shoes, and leggings

Other Related Categories

G06F 918, G06F 1300

Type

Patent

Status

active

Patent number

040992438

Description

ABSTRACT:
Data stored in a selected block of a memory associated with a data processing system is protected while a first device has access to any memory location in the selected memory block. If another device seeks access to the selected block of memory for the purpose of performing one or more predetermined unique sequences of operation while the first device is carrying any of such operations with respect to the selected memory block, the other device is locked out by means of a signal instructing it to abort the operation for which access is sought. Upon completion of the operation sequence by the first device, the selected memory block is unlocked and access is again available to any device. Further, a device addressing a location of memory for the purpose of carrying out one of a plurality of predetermined unique sequences is informed of the occurrence of events of significance to it by forcing an address register to a predetermined memory location comprised of a plurality of interrupt cells. During this process, other devices are denied access to the interrupt cells.

REFERENCES:
patent: 3328768 (1967-06-01), Amdahl et al.
patent: 3377624 (1968-04-01), Nelson et al.
patent: 3562717 (1971-02-01), Harmon et al.
patent: 3573736 (1971-04-01), Schlaeppi
patent: 3742458 (1973-06-01), Inoue et al.
patent: 3828327 (1974-08-01), Berglund et al.
patent: 3845425 (1974-10-01), Clements et al.
patent: 3858182 (1974-12-01), Delagi et al.
patent: 3893084 (1975-07-01), Kotok et al.
patent: 3997875 (1976-12-01), Broeren

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