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:
Aug. 24, 1982
Filed:
Jan. 07, 1980
Takakazu Huno, Tachikawa, JP;
Takeyuki Endo, Hinode, JP;
Kunihiro Odaka, Hinode, JP;
Yasutaka Shibuya, Tachikawa, JP;
Hitachi, Ltd., Tokyo, JP;
Hitachi Denshi Kabushiki Kaisha, Tokyo, JP;
Abstract
A data transfer system for use in a data processing system using a direct memory access mode of operation, which is equipped with a processor, a main memory and an input/output device. The data transfer system is characterized in that, when a group of data to be transferred exists in a plurality of areas of continuous addresses of the afore-mentioned memory, a table is provided in the afore-mentioned main memory with identifying information for each group of data indicative of the first address and the number of data items to be transferred from each area of continuous addresses. Only the first address and the number of data items are fed out of the processor to the input/output device by the program control; and in the input/output device, the content of the corresponding table is transferred from the main memory in accordance with the data fed out of the processor so that the direct data transfer may be effected between the main memory and the input/output device in accordance with the transferred table content.