System for direct access to a memory associated with a microproc

Details System for direct access to a memory associated with a microproc System for direct access to a memory associated with a microproc

1978-10-03

1980-12-16

Krass, Errol A.

Boots, shoes, and leggings

G06F 300

Patent

active

042401380

ABSTRACT:
System for direct access to a memory associated with a microprocessor data processing device comprising a direct access interface for introducing or extracting data in the memory during interruptions of the connection between the processing device and the memory, and a buffer interface operable during a portion of the access time of the processing device to the memory, to supply data addresses contained in the memory originating from the processing device and to enable circulation of corresponding data between the processing device and the memory, and during the remainder of the access time of the processing device, to the end of the access time, to store data transferred from the memory and to prevent transmission of data to the memory. A logic circuit controls inhibition of the buffer interface or of the direct access interface and, during the periods of inhibition of the buffer interface, permits the circulation of data and of addresses between the direct access interface and the memory.

REFERENCES:
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patent: 3949375 (1976-04-01), Ciarlo
patent: 3986170 (1976-10-01), Valassis et al.
patent: 3990055 (1976-11-01), Henderson et al.
patent: 4055851 (1977-10-01), Jenkins et al.
patent: 4067059 (1978-01-01), Derchak
patent: 4075691 (1978-02-01), Davis et al.
patent: 4079452 (1978-03-01), Larson et al.
patent: 4099236 (1978-07-01), Goodman et al.
Bounds; Peter, "Buffering High Speed Data for Minicomputer Input", Computer Design, Jul. 1973, pp. 69-73.

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