Access-time reduction control circuit and process for digital st

Details Access-time reduction control circuit and process for digital st Access-time reduction control circuit and process for digital st

1978-10-23

1980-11-25

Miller, Charles D.

Boots, shoes, and leggings

G06F 922

Patent

active

042362059

ABSTRACT:
A circuit and process for controlling access to a digital storage device is disclosed. The process involves reading a control word from a control store and partially decoding an address field of the control word to predict the storage location to be accessed. The address field is subsequently fully decoded to determine the actual storage location to be accessed. Prior to completion of this decoding step, an access to the predicted location in main storage is initiated. In the event the actual storage location to be accessed differs from the predicted one, the memory access previously initiated is overridden and an access to the actual storage location is initiated. A digital compouter system incorporating a circuit for carrying out this process exhibited significantly reduced running times for typical computer programs.

REFERENCES:
patent: 3728686 (1973-04-01), Weisbecker
patent: 3761885 (1973-09-01), Van Heel
patent: 3898624 (1975-08-01), Tobias
patent: 3900835 (1975-08-01), Bell
patent: 3940741 (1976-02-01), Horikoshi
patent: 4025771 (1977-05-01), Lynch
patent: 4050094 (1977-09-01), Bourke
Bergey "IBM Technical Disclosure Bulletin" vol. 20, No. 10 Mar. 1978.
Kratz "IEEE Trans. on Computers" vol. C-23 No. 8 Aug. 1974, pp. 808-817.
Agrawala "Foundations of Microprogramming" 1976 pp. 76-79.
Aichelmann "IBM Technical Disclosure Bulletin" vol. 18, No. 11 Apr. 1976 pp. 3707-3708.
Gindele "IBM Technical Disclosure Bulletin" vol. 20, No. 2, Jul. 1977.

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