Data transfer control equipment

Details Data transfer control equipment Data transfer control equipment

1985-12-23

1989-01-10

Kemeny, Emanuel S.

Boots, shoes, and leggings

360 49, G06F 1200

Patent

active

047978511

ABSTRACT:
A Direct Memory Access Controller includes first and second registers respectively to which first and the second offset data are supplied, as well as a register to which source address data is supplied and a register to which destination address data is supplied. Every time one data item is transferred from one memory to the other, the source address data and the destination address data are updated respectively by values designated by the first offset data and the second offset data. Address data can be updated both increasingly and decreasingly. According to the Direcet Memory Access Controller of this construction, the transfer of data such as a rotational operation of graphic data stored within the image memory can be achieved without increasing the burden imposed upon the microprocessor.

REFERENCES:
patent: 4204250 (1980-05-01), Getson, Jr. et al.
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patent: 4325120 (1982-04-01), Colley et al.
patent: 4521871 (1985-06-01), Galdun et al.
patent: 4584617 (1986-04-01), Libove et al.
patent: 4597041 (1986-06-01), Guyer et al.
patent: 4654791 (1987-03-01), Ushiro
"Nikkei Electronics", Aug. 2, 1982, No. 296, 129 to 158, Nikkei, McGraw Hill Inc.

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