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. 11, 1981
Filed:
Oct. 10, 1978
Yuzo Kita, Fuchu, JP;
Noboru Yamaguchi, Kokubunji, JP;
Masaru Shibukawa, Kokubunji, JP;
Kazuo Minorikawa, Nishi-ooizumimachi, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
In a system comprising a memory, an input/output control device, a direct memory access controller and a data bus, the transfer of data between the memory and the input/output control device via the data bus by means of said direct memory access controller during the period of direct memory access mode is effected by controlling the data transfer direction on a data bus so that a control signal for determining the direction of transferring the data by said data bus is recognized in an inverted manner at the memory or the input/output control device only during the period of a data transfer cycle in the direct memory access mode.