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. 02, 1981
Filed:
Nov. 21, 1978
Mitsuru Yamamoto, Kawasaki, JP;
Jun Arai, Yokosuka, JP;
Takao Isogawa, Yokohama, JP;
Isamu Hasebe, Yokohama, JP;
Panafacom Limited, , US;
Abstract
A direct memory access control (DMAC) system, in a data processing system, includes at least a central processing unit and a memory, the memory being capable of storing and providing data in any one of several predetermined formats. A plurality of input/output control ports, each connecting a respective input/output device to a common data bus, control data transfer in either direction between the device and the memory. A direct memory access control unit is connected to the common data bus for receiving an access request signal from any of the plurality of input/output control ports, and is connected to the memory for providing thereto, in response to the access request signal, instructions at least as to the size and desired format of the data transfer. A bus switching unit connects the common data bus to the memory, and is connected to the direct memory access control unit for receiving the instructions. The bus switching unit is responsive to the direct memory access control unit for interfacing the memory to the common data bus in such a manner as to cause the data transfer to be of the desired format.