Apparatus for controlling data transfer between storages

Details Apparatus for controlling data transfer between storages Apparatus for controlling data transfer between storages

1987-08-10

1989-04-11

Heckler, Thomas M.

Boots, shoes, and leggings

G06F 1300

Patent

active

048211729

ABSTRACT:
An apparatus for controlling a data transfer between storages in an information processing system having a main storage, an extended storage, and a processor in which data is transferred between the main storage and the extended storage by use of a synchronous instruction and an asynchronous instruction. The apparatus includes a unit to hold data transfer control information specified by the asynchronous instruction and a unit to hold data transfer control information specified by the synchronous instruction. Depending on a synchronous instruction or an asynchronous instruction, the data transfer is controlled to be achieved according to data transfer control information held in the unit associated with the instruction. The content of the unit is updated depending on the amount of data to be transferred. When a request of a data transfer is made by a synchronous instruction during a data transfer caused by an asynchronous instruction, the data transfer of the asynchronous instruction is interrupted to control the data transfer of the synchronous instruction to be executed. When the data transfer is completed, based on the content of the unit to hold data transfer control information of the asynchronous instruction, the data transfer of the asynchronous instruction interrupted is resumed.

REFERENCES:
patent: 4229790 (1980-10-01), Gillilano et al.
patent: 4325120 (1982-04-01), Colley et al.

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