Apparatus for data transfer between image memory and external I/

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395114, 395526, 395851, 395885, 3642403, 3642405, G06F 300, G06F 1338, G06F 1340

Patent

active

057178747

ABSTRACT:
In an image input/output control apparatus having three lines of n-bit bidirectional data buses provided on an external apparatus connection side of the apparatus and four lines of n-bit bidirectional data buses provided on an image memory side of the apparatus, there are provided a first inner register for setting the data transfer direction of each of the bidirectional data buses and a second inner register for setting an image valid area, whereby the data transfer direction of each of the bidirectional data buses is determined by a set point of the first inner register and the image valid area is determined by a set point of the second inner register.

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patent: 5448376 (1995-09-01), Ohta

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