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:
Dec. 10, 2002
Filed:
Feb. 06, 2001
Hitachi, Ltd., Tokyo, JP;
Abstract
An input/output device used as a transfer request source outputs a data transfer set command for specifying each transfer channel, each transfer address, the number of transfers, etc. onto a bus together with a data transfer request without being involving use of the CPU. According to the data transfer set command, data transfer control information is set to direct memory access control means, and DMA transfer is started between the input/output device and a memory designated by the transfer address, for example. When the input/output device used as a data transfer request source desires to perform data transfer without regard to a state of processing by the microcomputer, it can perform data transfer processing with its own timing and the data transfer with the input/output device as a principal base is allowed.