Direct memory access controller, direct memory access...

Details Direct memory access controller, direct memory access... Direct memory access controller, direct memory access...

2005-03-15

2005-03-15

Huynh, Kim (Department: 2182)

Electrical computers and digital data processing systems: input/

Input/output data processing

Direct memory accessing

C710S025000

Reexamination Certificate

active

06868457

ABSTRACT:
A direct memory access controller includes: one request signal input terminal for inputting a request signal while at least one of a plurality of request devices is outputting the request signal; one acknowledge signal output terminal for outputting an acknowledge signal to the plurality of request devices; and a control circuit. The control circuit outputs the acknowledge signal from the acknowledge signal output terminal and thereafter controls a data transfer based on the request signal from one of the plurality of request devices in response to a timing when the request signal inputted from the request signal input terminal changes in level.

REFERENCES:
patent: 4901234 (1990-02-01), Heath et al.
patent: 5497501 (1996-03-01), Kohzono et al.
patent: 5918070 (1999-06-01), Moon et al.
patent: 6006287 (1999-12-01), Wakazu
patent: 6154793 (2000-11-01), MacKenna et al.

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