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:
Jun. 19, 1984
Filed:
Nov. 24, 1981
Omron Tateisi Electronics Co., Kyoto, JP;
Abstract
A direct memory access control apparatus performs direct data transfer between a memory and an input/output controller in a data processing system. When the system is placed in a direct memory access mode upon receipt of a direct memory access request from the input/output controller, a data bus connected between the input/output controller and the memory is separated from a central processing unit by means of a data bus separating circuit, and an address bus of the memory is also separated from the central processing unit by means of an address bus switch circuit. The address bus of the memory is connected to a direct memory access controller by means of the address bus switch circuit. Therefore, the memory is addressed by the direct memory access controller through the address bus while the data is directly transferred between the memory and the input/output device through the data bus.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile