Direct memory access of a main memory by an input/output device

Details Direct memory access of a main memory by an input/output device Direct memory access of a main memory by an input/output device

1980-01-07

1982-08-24

Zache, Raulfe B.

Boots, shoes, and leggings

G06F 300

Patent

active

043464394

ABSTRACT:
A data transfer system for use in a data processing system using a direct memory access mode of operation, which is equipped with a processor, a main memory and an input/output device. The data transfer system is characterized in that, when a group of data to be transferred exists in a plurality of areas of continuous addresses of the afore-mentioned memory, a table is provided in the afore-mentioned main memory with identifying information for each group of data indicative of the first address and the number of data items to be transferred from each area of continuous addresses. Only the first address and the number of data items are fed out of the processor to the input/output device by the program control; and in the input/output device, the content of the corresponding table is transferred from the main memory in accordance with the data fed out of the processor so that the direct data transfer may be effected between the main memory and the input/output device in accordance with the transferred table content.

REFERENCES:
patent: 4245300 (1981-01-01), Kaufman et al.

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