The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 01, 1994
Filed:
Aug. 26, 1991
Masahiro Otake, Kyoto, JP;
Toyofumi Takahashi, Tokyo, JP;
Satoshi Nishiumi, Kyoto, JP;
Hitoshi Yamamoto, Tokyo, JP;
Nintendo Co., Ltd., Kyoto, JP;
Ricoh Co., Ltd., Tokyo, JP;
Abstract
A direct memory access apparatus includes a CPU, and data of one byte or more to be transferred is stored in a working RAM of the CPU or an external storage unit. The external storage unit includes a memory cartridge or a CD-ROM, and stores parameter data including the number of data to be transferred, and a first address and second address for direct memory access. Prior to a start of the direct memory access, the parameter data is read and, when a horizontal blanking signal is generated from a counter included in a video processor, the data is read from the working RAM or the external storage unit in accordance with the first address value and the data is transferred to an internal memory of the video processor in accordance with the second address value.